Video converter, video display and video conversion method

FIELD: information technology.

SUBSTANCE: secondary video signal is generated, said signal being composed of signals having values derived via conversion of intermediate values into values lying inside an output range according to a predetermined conversion rule when intermediate brightness values (determined by formulas where Smin is the output value of the lower limit, Xr to Xb are values of RGB signals of the main video signal, k is a constant, and Lr to Lb are intermediate values of RGB brightness), include a value greater than the value of the upper output limit, otherwise a secondary video signal consisting of a signal having an intermediate brightness value is generated.

EFFECT: preventing gradation error when a given video signal shows colour in a region outside the colour range of the video display element, performing signal conversion processing with low arithmetic load.

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The technical field to which the invention relates

The present invention relates to transducers of the video signal and a method for converting a video signal composed of luminance of each primary color (RGB), which can have a signal value within a wide range, partially includes the prescribed range of output power in a video signal composed of luminance of each primary color (RGB), which can have a value within the range of the output power, as well as a video display device containing a transducer signal. In addition, extended range means that the output range is expanded, and is wider than the range of power output.

The level of technology

In the video display device, such as a television receiver, a video display element such as liquid crystal display, produces a video image based on the video signal (hereinafter referred to as the video signal of the secondary side"), composed of the luminance signal of each primary color (RGB). As a rule, in relation to the luminance of the primary colors (RGB) video signals of the secondary side, his signal values, in short, the value of the brightness signal of each of the red, green and blue, normalized within the range o the ne power (as for example, from 0 to 255 or from 0 to 1) from a predetermined value lower limit (hereinafter called "output lower limit") up to the upper limit values exceeding the lower limit value (hereinafter called "output upper limit"). Here, the color that is expressed by a combination of signal values of the brightness of the primary colors (RGB) within the range of the output power, is the color in the color gamut produced by the video display element. In addition, the produced color range, that is produced by the video display element, known as the area of color reproduction or the range of color reproduction of the video display element. In addition, in the present description, the terms "manufacture" and "display" mean the same thing.

When the color scheme, that it is possible to display the video signal of the primary side, consistent with the color scheme, which is able to produce a item video display, the video signal of the primary side can be used as a signal of the secondary side. This allows visual color corresponding to the video signal of the primary side, displayed on the video display element. In addition, the video signal of the primary side is a video intended for input to the video display device (hereinafter called the Amy "input signal"), or the video signal obtained by acting on the input video signal is known conversion processing of the color gamut.

On the other hand, as in the case when the color scheme, that it is possible to display the video signal of the primary side which is wider than the color gamut of the video display element, when the color gamut that can be displayed by the video signal of the primary side, outside of the color gamut that can produce a item video display, the signal value of the video signal to the primary side can get the value outside of the range of output power. Therefore, the video signal of the primary side cannot be used as the video signal of the secondary side.

For example, there is a case when the range of the brightness values of the three primary colors in the video signal corresponds to the color gamut of the video display element, in short, the output range is from 0 to 1, while the signal value of the video signal to the primary side can be negative or more than 1. In this case, you must convert the video signal of the primary side to the secondary video side, composed of signal values within a range of output power. Such a condition requiring this conversion, for example, is the video signal of the primary side, representing the views of signal, appropriate IEC 61966-2-4 (commonly known as "xvYCC standard) and IEC 61966-2-1, whereas the signal of the secondary side may be a video signal corresponding to the standard ITU-R BT.709.

Here, as the method of conversion signal when the signal value of the video signal to the primary side is outside the range of output power, the signal of the secondary side can be converted with restrictions ("clipping") of the signal values of the video signal to the primary side in the range of output power. The clipping processing is the easy way to convert the signal and is also referred to as the "limiting process".

In addition, patent document Japanese unexamined patent application No. H09-98298 - reveals the level of art consists in the fact that the color gamut of the output system is narrower than the input system, and the color gamut of the input system is divided into regions in a two-dimensional plane bleaching and saturation, and then the compression of the color gamut, in short, the compression of the signal values is performed by setting the color phase constant in each divided region. In addition, the color gamut of the output system corresponds to the color gamut of the video display element, while the color gamut of the input system matches the colour scheme VI is iosignal the primary side.

However, to convert the video signal of the primary side in the video signal of the secondary side using the "clipping" there are a number of problems, such as below. Thus, since all the signal values of the video signal to the primary side, which exceed the range of output power, replaced by the output value of the lower limit or the output value of the higher limit, the uniformity of color in the video signal of the primary side is seriously weakened, in a word, an error occurs gradation.

On the other hand, as can be seen from the above-mentioned patent document, for converting the video signal to the primary side in the video signal of the secondary side by the compression of the color gamut, there are problems such as the following. Thus, even when the video signal of the primary side displays a color within the color gamut of the video display element, in short, even when the signal value of the video signal of the primary side is within the range of the output power, the signal can be converted into a video signal of different colors, although the color uniformity can be achieved. This causes a problem in the sense that the original color, which should display the incoming video signal may not be reproduced (displayed) exactly. In addition, in the processing shown in the KJV is anatom patent document the video signal is processed as data on a two-dimensional plane bleaching and saturation. The processing shown in the Patent document, in order to carry out the compression of the color gamut, such as the preservation of the colour phase constant, thus, turns into arithmetic processing using trigonometric functions, associated with high arithmetic load.

As a result, the present invention has been implemented on the basis of the above circumstances, and given the task of the present invention to provide a Converter of video signal conversion method of the video signal and the video display device that is able to accurately reproduce (display) the original color, which should display the video signal when the color scheme of this video corresponding to the video signal of the primary side, is not consistent with the colors produced by the video display element, and thus, the video signal is converted into a video signal representing the color within the color gamut of the video display element, and when this video displays a color within the color gamut of the video display element and in addition, is able to guarantee the uniformity of the color, i.e. capable of preventing an error gradation, when the video displays color in about the Asti outside the color gamut of the video display element, and at the same time capable of converting the signal processing at low arithmetic load.

Disclosure of invention

Converter video signal in accordance with the present invention is a device for converting a video signal (hereinafter called the "main video"), composed of the luminance signal of each primary color (RGB)that may obtain a signal value within a wide range, partially includes a range of power output from a predetermined output value lower limit to the output upper limit value, the secondary video signal. The secondary video signal is a video signal intended for entry in the prescribed element of the video display and is composed of luminance of each primary color (RGB)that may obtain a value within the range of output power. And also a video Converter in accordance with the first aspect of the present invention includes each component shown in the following sections (1-1) and (1-2).

(1-1) the Transmitter intermediate brightness values to calculate the interim luminance values of each primary color (RGB), which is obtained by applying brightness signals of each VI is th color (RGB) in the main video in the following formulas (A1) and (A2).

However, Smin represents the output value lower limit (lower limit value of each of the luminance signal in a secondary video signal); Xr, Xg and Xb are respectively the value of the brightness signal (R), the value of the brightness signal (G) and the brightness value of the signal (B) in the primary video signal; (c, m, y, Xr', Xg'and Xb' are variables; k is a constant (0<k); and Lr, Lg and Lb, respectively, are intermediate brightness value R, the intermediate brightness value of the G and intermediate brightness value B.

(1-2) secondary element generation of the video signal to generate a secondary video signal composed of signals of values within a range of output power converted from the interim luminance values of each primary color (RGB) in accordance with a predefined mapping rule, when the intermediate values of the brightness of each primary color (RGB) include a value greater than the output value upper limit; secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the intermediate values of the brightness of each primary color (RGB) do not include a value greater than the output value of the upper limit.

Here, when the secondary video performance is to place a video signal, composed of luminance of each primary color (RGB)that may obtain a signal value within the range of power output as a normalized range of values from 0 to 1, the main video signal is a video signal composed of luminance of each primary color (RGB)that may obtain a signal value within a wide range, as the range of normalized values from negative values to values greater than 1. In this case, the formula (A1) can be replaced by the following formula (A1'), because the output value lower limit output value upper limit are 0 and 1, respectively. Formula (A1') is one example of the formula (A1).

In addition, the present invention does not require mandatory calculation of the interim luminance values of each primary color (RGB) in accordance with formulas (A1) and (A2), and the calculation of the interim luminance values of each primary color (RGB) can be performed by executing processing appropriate to obtain the equivalent result for one treatment in accordance with the formulas (A1) and (A2). For example, the calculation of the interim luminance values of each primary color (RGB) can be achieved by performing the processing for calculation of the signal is about values based on the other arithmetic expressions, suitable to obtain the equivalent result for one of the processing for calculation of the signal values in accordance with the formulas (A1) and (A2), or converting the signal processing based on a prescribed table of signal values.

And also the main video signal is a signal after converting the color gamut responsible for the colours displayed by the video display element, i.e. responsible for the produced color. Therefore, when the signal value of the primary video signal is within the range of output power, the original color, which should display the main video signal is accurately reproduced by the video display element, if the main video signal is used as a secondary video signal being such.

In addition, as previously defined mapping rule for the secondary elements of a work of video signals, for example, can be used in a rule in any of the following paragraphs (3) or (4).

(3) to replace the largest value in the intermediate brightness values output value of the upper limit, and at the same time, squeezing other intermediate brightness values based on the ratio determined in accordance with the maximum value in the intermediate brightness values.

(4) in order JUA is ü all intermediate values of brightness of each primary color (RGB) according to the ratio between the width of the range of values from the output value lower limit to the greatest value of the interim luminance values of each primary color (RGB) and a wide range of power output.

The following describes the conversion processing of the video signal in accordance with the present invention. In the following description "the level of gradation" is a value obtained by subtracting the output value lower limit (Smin) of the signal intensity values (signal values Xr, Xg, and Xb) of each primary color (RGB). And also, when the output value of the lower limit is 0 (Smin=0), the signal value (brightness value) and the gradation level of each primary color (RGB) are the same value.

In the present invention, when the signal values (Xr, Xg, and Xb) in the primary video signal are within a range of output power, the main video signal becomes the secondary video, the way he is. Briefly, in the formulas (A1) and (A2) intermediate brightness values represent Lr=Xr, Lg=Xg and Lb=Xg, and these values are what they are, become the signal values of the brightness of the primary colors (RGB) in the secondary signal.

In addition, in accordance with the present invention, when the gradation level of the base color in the main video signal is a negative level, briefly, when the signal values Xr, Xg and Xb is less than the output lower limit value Smin, the gradation level (negative level) replaced positive in what UNAMI gradation of the other two primary colors, having a level in accordance with its magnitude (absolute value). For example, when the output range from 0 to 1 and when the brightness value of the signal R in the main video-0.1, means of calculating the average brightness replace the negative gradation level (-0.1-0=-0.1) of the luminance signal R is a positive gradation (kc: but c=0-(-0.1), k is a constant positive value) of the two primary colors (G and B) in accordance with its value. This means that the negative gradation level (-c) primary color R is replaced with a positive level of gradation (c) cyanide, such as complementary colors of the primary colors R, and further, the positive gradation level (c) cyanide is converted to a positive gradation levels (kc) of each of the other two primary colors (G and B) by means of additive color mixture.

In addition, in the present invention, when all the average signal values of each primary color (RGB) is equal to or less than the output value of the upper limit, these values are what they are, become the signal values of the secondary signal. The average signal values in this case are equivalent to the values of the secondary signal. Therefore, the term "intermediate brightness value"may mean signal value calculated using the technology of converting the signal of the main control signal in a secondary video signal, however, when all the average signal values of each primary color (RGB) is equal to or less than the output value of the upper limit, the term "intermediate brightness value" can be easily replaced, "signal value of the secondary video signal".

As described above, in accordance with the present invention, when the signal values (Xr, Xg, and Xb) in the primary video signal are within a range of output power, the main video signal becomes the secondary video signal, for what it is, and thus, the original color, which should display the main video signal can be accurately reproduced (defined) element of the video display.

And also, in accordance with the present invention, when each value of the luminance signal of the three primary colors in the main video signal is less than the output lower limit value, i.e. when the gradation level is negative, the negative gradation level of the existing primary color, in accordance with its value, in other words, in accordance with the absolute value of the negative gradation level, is replaced by the positive gradation levels of the other two primary colors. In accordance with the present invention for this purpose, even when the main video signal includes a signal value having a negative gradation level, briefly, even when one and the and more of each signal of RGB values below the output value lower limit, color according to combinations of levels of gradation (combination of each level of the primary colors (RGB)) can be produced (shown) elements of the display. In addition, in this case, if the intermediate brightness value does not exceed the output upper limit value, the uniformity of color in the region outside the color gamut of the video display element can be provided. In addition, the ability to ensure uniformity of color refers to the ability to prevent errors gradation. In addition, the conversion processing of the video signals, in accordance with the present invention can be implemented in a simple four arithmetic operations with low arithmetic complexity, on the basis of the signal values of each primary color (RGB).

However, rarely is a situation where for each signal of the three primary colors of intermediate brightness values Lr, Lg and Lb of each primary color (RGB)obtained by replacing the negative level to the positive gradation gradation signals of the other two primary colors, can exceed the output value of the upper limit. In this case, the intermediate brightness value may be compressed to produce a second video signal in accordance with the rules in (3) and (4). Doing this ensures that, in the area outside tsvetova the gamut of the video display element uniformity of color in the region outside the color gamut of the video display element. In short, the error gradation can be prevented.

Especially, when a secondary signal produced by compression of the intermediate brightness values in accordance with the rule in (4), color balance, i.e. the color phase between the three primary colors in a temporary brightness value can be maintained also in the secondary signal.

In addition, when the constant k is equal to 1 in the formula (A2), as will be described, the expression of the color phase of the color of the main video signal and expressions color phase of the color intermediate brightness values can correspond with each other. In addition, in this case, when the expression of the original primary color video signal represents a color outside the color gamut of the video display element, the color will be approximately the same as the original color can be produced by the video display element.

In the invention described above, when the luminance of the three primary colors in the main video signal includes two or more signal, less than the output lower limit value, the negative gradation levels of each of the two or more primary colors replaced the positive gradation levels of the other two primary colors in accordance with its value. In addition, the fact that the brightness value of the signal is less than the output lower limit value means that UB is the tier gradation negative. And also the value of the gradation level implies the absolute value of the level.

However, only with respect to the minimum value among multiple values in the main video signals that are lower than the output lower limit value, in the phase when processing was carried out to replace the negative level to the positive gradation gradation of the other two primary colors cannot be greater than the base color having a negative gradation level. In this case, in relation to values other than the minimum value among multiple values in the primary video signal is less than the output lower limit value, there is no need to do the item processing replacement to replace the negative level to the positive gradation gradation of the other two primary colors.

In addition, in the phase when processing was carried out to replace the negative level to the positive gradation gradation of the other two primary colors, only in relation to the two smallest values among these three values in the primary video signal is smaller than the output value lower limit cannot be greater than the base color having a negative gradation level. Similarly, in this case, there is no need to perform processing of replacement in order to replace the negative level of the positive gradation gradation of the other two primary colors all negative gradation levels of each of the three primary colors.

Accordingly, Converter video signal according to the second aspect of the present invention includes each component that is described in the following formulas (2-1) and (2-2).

(2-1) the Transmitter intermediate brightness values, which computes intermediate values of brightness of each primary color (RGB), which performs conversion processing of the first complementary color, is designed for installation output value lower limit to the signal value of the primary color having the minimum basic signal value when the minimum basic signal value as the minimum value among the signal values of the brightness of each primary color (RGB) in the primary video signal is less than the output lower limit value, and at the same time is to set the value, obtained by summing the complementary positive value proportional to the difference between output the value of the lower limit and the minimum basic signal value from signal values of two primary colors, in addition to the basic minimum signal values in the main video.

(2-2) Secondary element generation of the video signal to generate a secondary video signal composed of signals of values obtained by converting the intermediate C is achene brightness of each primary color (RGB) values, within the range of output power, in accordance with a predefined mapping rule, when the intermediate values of the brightness of each primary color (RGB) include a value greater than the output value upper limit; secondary video signal composed of signals of the interim luminance values of each primary color (RGB), if the intermediate values of the brightness of each primary color (RGB) do not include a value greater than the output value of the upper limit.

(2-2) is the same as (1-2) in the transducer signal in accordance with the first aspect of the present invention.

In addition, the transmitter intermediate brightness values may perform the processing described in (2-1a) or (2-1b).

(2-1a) the Transmitter intermediate brightness values calculates intermediate values of brightness of each primary color (RGB)by introducing, in addition to the conversion processing of the first complementary color conversion processing of the second complementary color, as will be described below, when the minimum of the transformed signal is a complementary color, as the minimum value among described later, the first transformed signal values of the complementary color will be less than the output value of the lower PR is the case.

In addition, the complementary signal value of the first complementary color represents a signal value of each primary color (RGB)obtained by using conversion processing of the first complementary color.

In addition, the conversion processing of the second complementary color designed to set the output value lower limit for the signal values of the base color having the converted signal value of the first complementary color, and at the same time, the signal values of two other colors, to set the value, obtained by summing the complementary positive value proportional to the difference between the output value lower limit and postimplementation minimum converted signal value of the first color signal values of two primary colors other than the minimum of the transformed signal values of the first complementary color in the transformed signal values of the first complementary colors.

(2-1b) the Transmitter intermediate brightness values calculates intermediate values of brightness of each primary color (RGB)by introducing, in addition to the conversion processing of the first complementary color and converting the second processing complementary to the Council, complementary conversion processing of the third color, as will be described below, when the minimum converted signal value of the second complementary color, as the minimum value among described below complementary signal values of the second complementary color, is less than the output lower limit value.

In addition, the complementary signal of the second complementary color represents a signal value of each primary color (RGB)obtained by using conversion processing of the second complementary color.

In addition, the conversion processing of the third complementary color designed to set the output value lower limit for the signal values of the base color having the minimum converted signal value of the second complementary color, and at the same time, the signal values of two other colors, to set the value, obtained by summing the complementary positive value proportional to the difference between the output value of the lower limit and the minimum of the transformed signal value of the second complementary color signal values of two primary colors, except for the minimum converted signal snakeriver complementary colors in the converted signal values of the second complementary color.

Converter video signal according to the second aspect of the present invention can avoid the unnecessary increase of the interim luminance values of each primary color (RGB). As a result, the change (increase) brightness (lightness) video, caused by conversion of the signal from the main signal to the secondary video signal can be minimized.

In addition, in a state in which the transducer signal according to the second aspect of the present invention performs conversion processing of the third complementary color, as shown in the above-mentioned 2-1b, in the end, the results obtained by the Converter of the video signal in accordance with a second aspect of the present invention, and transducer signal, in accordance with the first aspect of the present invention, are the same.

As an example of the primary signal can be considered a video signal complying with the standard IEC 61966-2-4, or IEC 61966-2-1, as well as the above-mentioned video signal which has been subjected to gamma processing. IEC stands for the International Commission for Electrical, IEC 61966-2-4 is the so-called new international standard for expanded color space for kinosobytiya: xvYCC.

On the other hand, as an example of a secondary video or secondary) is Ala, subjected to gamma processing, you can consider the video signal corresponding to the standard ITU-R BT.709 or ITU-R BT.601-5. ITU stands for international Telecommunications Union.

In addition, the present invention can also be viewed as a video display device that includes a transducer signal in accordance with the present invention, described above, and the video display element for displaying a video image based on the secondary signal produced by the video Converter.

And also the present invention can also be viewed as a way to convert a video signal in which the processing conducted by each tool in the transducer signal, in accordance with the present invention, described above, is performed by the processor. In addition, the processor may be determined as the arithmetic means or computer.

In accordance with the present invention, when the signal values (Xr, Xg, and Xb) of the main video signal are within a range of output power, the main video signal becomes the secondary video, the way he is, and thus, the original color, which should display the main video signal can be accurately produced (displayed) element of the video display. Furthermore, "within the range of power output" means within di is the scoring range, where you can get the signal value of the secondary video signal for inputting to the video display element.

And also, in accordance with the present invention, when the main signal is a signal indicating the color in the area outside the color gamut of the video display element, and when at least the level of the gradation signal is negative, the uniformity of color in the region outside the color gamut of the video display element can often be provided. In addition, to ensure uniformity of color means to provide the ability to prevent errors gradation. Especially, when the coefficient k (a constant) in the formula (A2) is equal to 1, the color phase of the color expressed the main signal (the original signal), and the color expressed by the secondary video signal can correspond with each other. As a result, when the original color, which displays the main video signal is a color outside the color gamut of the video display element, a color approximately the same as the original color can be produced by the video display element.

In addition, the conversion processing of the video signals in accordance with the present invention can be implemented in four simple arithmetic operations, that is simple arithmet the standard low load operation, based on signal values of each primary color (RGB), and, thus, can be performed by a processor with relatively low performance.

Brief description of drawings

FIG. 1 is a block diagram showing the overall configuration of the main part of the device Z video display in accordance with the embodiment of the present invention;

FIG. 2 is a view showing the overall configuration of the main part Z' of the video display as the type of device Z video display;

FIG. 3 is a conceptual diagram of a vector expressing an ActiveX control signal range Z video display replaces the negative level of the primary color gradation "B" positive gradation levels of the other two primary colors;

FIG. 4 is a view expressing the chart of Venosta specific example (first example) reproductive color video signal;

FIG. 5 is a view expressing the chart of Venosta specific example (second example) reproductive color video signal;

FIG. 6 is a view expressing the chart of Venosta specific example (third example) reproductive color video signal;

FIG. 7 is a view expressing the chart of Venosta specific PR the measures (fourth example) reproductive color video signal.

The implementation of the invention

Further with reference to the drawings variant implementation of the present invention are explained in order to provide a sufficient understanding of the invention. In addition, an implementation option is a simple example implementation of the present invention and is not intended to limit the technical scope of the present invention.

FIG. 1 is a block diagram showing the overall configuration of the main part of the device Z video display in accordance with the embodiment of the present invention; FIG. 2 is a view showing the overall configuration of the main part Z' of the video display as the type of device Z video display; FIG. 3 is a conceptual diagram of a vector expressing an ActiveX control signal range Z video display replaces the negative level of the primary color gradation "B" with the positive gradation levels of the other two primary colors; and FIG. 4-7 are images showing specific examples of charts Venosta (first to fourth examples) reproductive color video signals.

The video display device Z, in accordance with the embodiment of the present invention includes, as shown in FIG. 1, the display 5, as an element videodisplay and Converter Q signal. Converter Q video Converter is to convert the incoming signal into the RGB signal to be supplied to the display 5.

The display 5 is a device such as a liquid crystal display or a cathode ray tube, which receives the video signal composed of luminance (signal R, the signal G and the signal (B) each primary color (RGB), and produces a video image based on the input video signal. The video signal (RGB signal)that is designed to enter in the display 5 is a signal composed of luminance of each primary color (RGB)that may obtain a value within the range (hereinafter referred to output range W") from a predetermined output value lower limit Smin, to the output upper limit value Smax. This video further referred to as "nonlinear secondary video signal V2. In addition, Smin is less than Smax. In addition, the video signal input to the display 5, and the RGB signal correspond, for example, standards ITU-R BT.709 and ITU-R BT.601-5. In addition, nonlinear secondary video signal V2' is a signal obtained by normalizing the signal values (brightness values of each signal of red, green and blue) within the output range W (for example, from 0 to 255 or from 0 to 1)to deter estolate color in the colors, produced on the display 5.

The video signal is expressed from the color gamut, more extended than the colors produced by the display 5, is injected into the video display device Z. This video in the future referred to as "incoming video signal V0".

Converter Q video carries out processing to convert the video signal V0 input from the outside, in the nonlinear primary video signal V1'as a video signal composed of luminance of each of the RGB signal (main color: RGB), and at the same time transform the nonlinear primary video signal V1' in the nonlinear secondary video signal V2' to enter in the display 5. Here, the nonlinear secondary video signal V2' is a video signal composed of luminance of each primary color (RGB)that may obtain values within the output range W.

In addition, the Converter Q signal is designed in such a way that includes recording media such as a ROM, which represents the diagram of digital data or digital item, such as, for example, DSP (digital signal processor) and ASIC (specialized application schema), which recorded the arithmetic processor and the program provided by the processor and peripheral devices such as RAM. Element 1 generate a signal RGB, item 2 gamma processing the primary side, the element is provided 3 regulation of signal range and element 4 gamma processing the secondary side, as the corresponding component of the transducer signal Q, implemented by a processor that executes the program corresponding to each processing.

In addition, each component contained in the Converter Q video signal, controls the delivery and reception of the signal values so that the subsequent stage reads and refers to the signal value stored in the memory component of the preliminary stage. The signal is recorded in the memory, is the result of signal processing carried out by each component.

Next will be described the processing element 1 generate a signal RGB, item 2 gamma processing the primary side, item 3 of the regulation of the signal range and item 4 gamma processing secondary side of the Converter Q signal.

Element 1 develop a RGB signal carries out processing for converting the input video signal V0 input from the outside, in the nonlinear primary video signal V1'as a video signal composed of luminance of each primary color (RGB). Converting processing in the nonlinear primary video signal V1' is a processing to generate a signal RGB.

The input video signal V0 is a video signal, such as YUV or Ycbcr signal corresponding to IEC 61966-2-4 or IEC 61966-2-1, and its colors over the extended than colors that can be displayed (reproduced) on the display 5.

Since the color gamut that can be expressed by an incoming video signal V0, more extended than the color gamut of the display 5, i.e. the color gamut that can be expressed by the input video signal V0, the nonlinear primary video signal V1' becomes the RGB signal, which can receive the signal value in the extended range W', partly involving output range W. Here, the range of output power W is in the span of the output value lower limit Smin to the output upper limit value Smax. In addition, the RGB signal is a video signal composed of luminance of each primary color (RGB).

In addition, IEC 61966-2-4 and IEC 61966-2-1 prescribed conversion rule, in other words, the conversion formula for converting YUV and Ycbcr signal corresponding to each standard, the RGB signal that corresponds to the same standard. Element 1 develop a RGB signal Converter conducts the signal processing in accordance with the rule. Therefore, when the incoming video signal V0 is a video signal, such as YUV and Ycbcr signal corresponding to IEC 61966-2-4 or IEC 61966-2-1, nonlinear primary video signal V1 becomes the RGB signal, also meet the relevant IEC 61966-2-4 or IEC 61966-2-1.

The nonlinear primary video signal V1' and the nonlinear secondary video signal V2' are signals having a non-linear relationship between signal value, as the gradation value of its brightness and the brightness of the current color, the corresponding signal value. Further, with respect to each of the nonlinear primary video signal V1' and the nonlinear secondary video signal V2'signal, so adjusted to have a linear relationship between signal value and the brightness of the current color corresponding to the signal value, referred to respectively as "linear primary video signal V1 and the linear secondary video signal V2.

Element 2 gamma processing the primary side performs processing to convert the nonlinear primary video signal V1' in the linear primary video signal V1, ensuring the well-known gamma processing of the nonlinear primary video signal V1'. In addition, gamma processing is also referred to as gamma correction processing. Typically, the element 2 gamma processing the primary side provides gamma processing in accordance with the curve of the gamma distribution with a gamma value of 1/2 .2. The linear primary video signal V1 represents the video signal values, which can get the value within the extended range W'. the moreover, table of signal conversion or the conversion formula accessed element 2 gamma processing the primary side for the transformation of the nonlinear primary video signal V1' in the linear primary video signal V1, previously recorded in memory (such as ROM)contained in the Converter Q signal.

In addition, item 3 of the regulation signal range carries out processing for converting the linear primary video signal V1 is composed of the luminance signal of each primary color (RGB)that may obtain the signal value in the extended range W', partly involving output range W in the linear secondary video signal V2, composed of the luminance signal of each primary color (RGB)that may obtain a value in the range of output power W. the Next will be described the processing element 3 regulation of signal range.

First element 3 of the regulation signal range calculates intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB), which can be obtained by setting the signal intensity values (Xr, Xg, and Xb) of each primary color (RGB) mainly linear video signal V1 in the following formulas (A1) and (A2). Item 3 of the regulation of the signal range for the calculations is one example of the transmitter between the exact values of brightness. In addition, the Converter Q video signal brightness values (Xr, Xg, and Xb) primary colors (RGB) in the "main video" in the formulas (A1) and (A2) are the signal values of the brightness of each primary color (RGB) mainly linear video signal V1.

In the formulas (A1) and (A2):

Smin is the output value lower limit (lower limit value of each of the luminance signal in a secondary video)

The value of Xr is the value of the luminance signal R in the main video

The value of Xg - value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, m, y, Xr', Xg', Xb' - variables

k is a constant (however, o<k)

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

May be the case when the nonlinear secondary video signal V2' and the linear secondary video signal V2 represent the video signal composed of luminance of each primary color (RGB)that may obtain the signal value in the range (one example of the range of output power (W) between 0 and 1 as the normalized value. In this case, the nonlinear primary video signal V1' and the linear primary video signal V1 represent a video signal composed of luminance each the primary color (RGB), which can receive the signal value in the range (one example of an extended range W') between a negative value and a value greater than 1 as the normalized value. In addition, in this case, the output value lower limit that Smin is set to 0, and the output value of the upper limit Smax, and therefore, the formula (A1) can be replaced by the following formula (A1'). Formula (A1') is an example of the formula (A1).

In formulas (A1') and (A2):

The value of Xr is the value of the luminance signal R in the main video

The value of Xg - value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, m, y, Xr', Xg', Xb' - variables

k is a constant (however, o<k)

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

Moreover, item 3 of the regulation signal range generates linear secondary video signal V2, based on the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB), when the intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) include a value greater than the output value of the upper limit Smax, in other words, when satisfied one or more of three conditions: "Lr> Smax", "Lg> Sma", and "Lb> Smax". This linear secondary video signal V2 is a signal value obtained by converting the interim luminance values (Lr, Lg, and Lb) of each primary color (GRB) to values within the range of output power W in accordance with the predefined secondary conversion rule. Item 3 of the regulation of the signal range for carrying out this processing is one example of a secondary element of the production of the video.

Here, as a pre-defined secondary conversion rule, for example, may be the conversion rule in accordance with the following formula (B1). In addition, in the existing Converter Q signal values (Yr, Yg and Yb) luminance of the primary colors (RGB) in "secondary video" in the formula (B1) are the values of the luminance signal of each primary color (RGB) in the linear secondary video signal V2.

In the formula (B1):

Smin is the output value lower limit (lower limit value of each of the luminance signal in a secondary video)

The value of the upper limit Smax=the lower value of the upper limit of each of the luminance signal in a secondary video),

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

Znachenie - the value of the luminance signal R in the secondary video

Value Yg - value of the luminance signal G in the secondary video

The value of Yb - value of the brightness signal B in the secondary video

In the formula (B1) shows the rule for linear compression of all of the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB) under the influence of the ratio (Smax-Smin) range output power W to the width (Lmax-Smin) range of the output value lower limit Smin to the maximum value Lmax in the interim luminance values of each primary color (RGB).

The conversion rule based on the formula (B1), is one example of the rules for replacement of the maximum value Lmax" among the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB) output value upper limit Smax, and in addition, compressing other intermediate brightness values based on the ratio selected in accordance with the value of the maximum value Lmax" among the interim luminance values (Lr, Lg and Lb). In addition, the compression ratio in the conversion rule, on the basis of formulas (B1)represents the ratio of the width (Smax-Smin) range output power W to the width (Lmax-Smin) of the output value lower limit S to the maximum value Lmax in the intermediate brightness values.

In addition to the above method, you is isline (way finding) compression ratio, for example, there may be used a method of calculating the compression ratio, based on quadratic functions, exponential functions, or the like, the above-mentioned ratio, asymptotically approaching to a prescribed value convergence (value greater than 0 and smaller than 1) from 1 difference (Lmax-Smax) between the maximum value Lmax in the intermediate brightness values and increased output values of the upper limit Smax. Intermediate brightness value, in addition to the maximum value Lmax" among the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB), multiplied by the compression ratio, defined as described above, thus, compressing the signal value (brightness value).

In addition, as a secondary conversion rules can be used in the conversion rule based on the following formula (B2). Also in the existing Converter Q signal values (Yr, Yg and Yb) luminance of the primary colors (RGB) in "secondary video" in the formula (B2) are the values of the luminance signal of each primary color (RGB) in the linear secondary video signal V2.

In the formula (B2):

The value of the upper limit Smax=the lower value of the upper limit of each of the luminance signal in a secondary video),

Lr-R Subtotal jar the spine,

Lg-G intermediate brightness value,

Lb-B intermediate brightness value,

Value Yr value of the luminance signal R in the secondary video signal,

Value Yg - value of the luminance signal G in the secondary video signal,

The value of Yb - value of the brightness signal B in the secondary signal.

Formula (B2) illustrates the clipping processing to replace the values in the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB), larger than the output value upper limit Smax, the output value of the upper limit Smax. However, when using this clipping processing, the color uniformity of the secondary linear video signal V2 is deteriorating.

On the other hand, when the intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) do not include a value greater than the output value of the upper limit Smax, briefly, when the terms: "Lr≤Smax, Lg≤Smax", and "Lb≤Smax" run, item 3 of the regulation signal range produces the linear secondary video signal V2, composed of the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB). Item 3 of the regulation of the signal range for carrying out this processing is one example of a secondary element works video. Briefly, when the terms: "Lr≤Smax, Lg≤Smax", and "Lb≤Smax" executed element 3 regulirovaniya range produces the linear secondary video signal V2, having intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) directly as signal values (Yr, Yg and Yb).

The linear secondary video signal V2 is produced by the item 3 of the regulation range of the signal mentioned above, is a signal with its signal values (Yr, Yg and Yb), can be within the range of the output power W1.

In addition, item 4 gamma processing secondary side converts the linear secondary video signal V2 in the nonlinear secondary video signal V2', exposing the well-known gamma processing the linear secondary video signal V2 is produced by the item 3 of the regulation range of the signal. This nonlinear secondary video signal V2' is composed of the luminance signal of each of the red, green and blue. Typically, the element 4 gamma processing secondary side gamma conducts processing in accordance with the curve of the gamma distribution with a gamma value of 2.2 (inverse gamma values in item 2 gamma processing of the primary side). Nonlinear secondary video signal V2'made by item 4 of gamma processing the secondary side also becomes a signal having signal values (Yr, Yg and Yb) within the range of the output power W1. Then, the display 5 displays a video image based on the nonlinear secondary video signal V2', extracted and the element 4 gamma processing the secondary side.

Next will be described conversion processing of the video signal using a Converter Q signal. In addition, in the following description, the value obtained by subtracting the output value lower limit (Smin) of the signal of the brightness values (Xr, Xg, and Xb) of each primary color (RGB), referred to as "gradation level".

When the signal values (Xr, Xg, and Xb) of the linear primary video signal V1 are within range of output power W, the inverter Q video considers the linear primary video signal V1 as a linear secondary video signal V2, the way he is. Briefly, in the formulas (A1) and (A2), in intermediate luminance values Lr=Xr, Lg=Xg and Lb=Xg, and intermediate brightness values are what they are, become values (Yr, Yg and Yb) of the luminance signal of the primary colors (RGB) in the linear secondary video signal V2.

And also, when the gradation level of the base color in a mostly linear video signal V1 is negative, in other words, when any of the signal values Xr, Xg and Xb is less than the output lower limit value Smin, the Converter Q video immediately replace the negative level to the positive gradation gradation of the other two primary colors, having a level corresponding to its magnitude (absolute value). For example, when the output range from 0 to 1 and when the value is s Xr brightness signal R mostly linear video signal V1 is equal to-0.1, item 3 of the regulation signal range replaces the negative gradation level is 0.1 Xr brightness signal R is a positive gradation (kc) of the two primary colors (G and B), in accordance with its value. However, the calculation formula for negative gradation level -0,1 is a "-0.1-0 and c=0-(-0.1), where k is a constant. This means that the negative gradation level "-c" primary colors R replaced by positive gradation level "c" cyanide, such as complementary colors of the primary colors R, and then the positive gradation level "c" cyanide converted into a positive gradation levels "kc" each of the other two primary colors (G and B), by means of additive color mixture.

Similarly, when the output range from 0 to 1 and when the value of Xg of the luminance signal G is basically a linear video signal V1 is equal to-0.1, item 3 of the regulation signal range replaces the negative gradation level -0,1 Xg of the luminance signal G is positive gradation "km" the other two primary colors (R and B), in accordance with its value. However, the calculation formula for negative gradation level -0,1 is a "-0.1-0 and m=0-(-0.1), where k is a constant. This means that the negative gradation level (-m) of the primary color G is replaced by a positive gradation level (m) Magenta, as the idea is internova color to the primary color G, further positive gradation level (m) Magenta converted to positive levels of gradation (km) of each of the other two primary colors (R and B) by means of additive color mixture.

Similarly, when the output range is from 0 to 1 and when the value Xb of the brightness signal B is basically a linear video signal V1 is equal to-0.1, item 3 of the regulation signal range replaces the negative gradation level is 0.1 Xb brightness signal B positive gradation "ky" the other two primary colors (R and G), in accordance with its value. However, the calculation formula for negative gradation level -0,1 is a "-0.1-0 and y=0-(-0.1), where k is a constant. This means that the negative gradation level "-y" primary color "B" is replaced by a positive gradation level "y" Magenta as the complementary color of the base color "B", and a further positive gradation level "y" Magenta transformed into a positive gradation levels "ky" each of the other two primary colors (R and G) by means of additive color mixture.

FIG. 3 is a conceptual diagram of a vector expressing that item 3 of the regulation signal range replaces the negative level of the primary color gradation "B" positive gradation levels of each of the other two primary colors (R, G). In FIG. 3 is a Christmas tree in six areas indicate the coordinate axes primary colors "R", "G" and "B" and their complementary colors: cyan (C), Magenta (M) and yellow (Y).

As shown in FIG. 3, when the gradation level "Xb-Smin" primary color "B" mostly linear video signal V1 is negative, item 3 of the regulation signal range replaces the negative level to the positive gradation level of the gradation "y" is yellow, as is the complementary color of the base color "B", and a further positive gradation level "y" is yellow replaced with a positive gradation "ky" each of the other two primary colors (R and G) by means of additive color mixture. In addition, in the example shown in FIG. 3, k=1.

FIG. 4-7 are images showing specific examples xy-diagrams of Venosta reproductive color video signals. And also, in FIG. 4-7, the plot indicated by the structure of the solid line and inside it, the colors produced by the display 5 as the so-called high clear display, briefly, the color scheme of the secondary linear video signal V2 and nonlinear secondary video signal V2', while the area marked by the dashed line and inside it, is the colour scheme Venosta CIE1931. In FIG. 4-7 output range is from 0 to 1, "Smin=0", and the "Smax=1".

In addition, the conversion formula to convert from the signal values of the primary colors (RGB) in the coordinate values x and HC diagram Venosta is the following formula (E1), which is prescribed in IEC 61966-2-4. In addition, RGB in the formula

(E1) - the brightness of each primary color (RGB), while the x-and y - coordinate values in an xy-diagram Venosta.

In addition, the processing element 3 of the regulation range of the signal, the constant k in the formula (A2), presumably equal to 0.5, and the secondary conversion rule, presumably, represents the conversion rule based on the formula (B1).

In FIG. 4 coordinate a1 of the first color represents the coordinate when the signal values (RGB) video signal are signal values (0.027397, 0, and-0.803228), including negative values. And also coordinate a2 of the second color represents the coordinate at the time when the signal values (RGB) video signal are signal values (0.027397, 0,- 0.100000), including negative values. In addition, the coordinates b1 and b2 represent the coordinates of the colors obtained by converting the signal values in the signal that indicates each first and second color signal values lying within the range of output power W by the clipping processing. In addition, the coordinates of c1 and c2 are the coordinates of the colors obtained by the item 3 of the regulation range of a signal by converting the signal values of the principal is inanim video signal V1, as a signal indicating each of the first and second color signal values lying within the range of the output power W.

As can be seen in FIG. 4, the clipping processing converts the first color coordinate a1) and the second color coordinate a2)different from each other, in the same color (the same coordinates b1 and b2) within the color gamut of the display 5, by converting the signal. On the other hand, as can be seen in FIG. 4, the processing element 3 of the regulation range of the signal to convert the first color coordinate a1) and the second color coordinate a2)different from each other, in different colors (coordinates c1 and c2 are distinct from each other) within the color gamut of the display 5, by converting the signal.

And, in addition, in FIG. 5, the coordinate a3 of the third color represents the coordinate at the time when the signal values (RGB) video signal are signal values (-0.6647, 1.1739, and 0.0241), including a negative value and a value greater than 1. In addition, the coordinate a4 of the fourth color is a coordinate, at the time when the signal values (RGB) video signal are signal values (-0.3, 1.1739, and 0.0241), including a negative value and a value greater than 1. And also coordinates b3 and b4 represent the coordinates of the colors obtained by converting signals the s values in the video signal, indicating each of the third and fourth color signal values lying within the range of output power W by the clipping processing. In addition, the coordinates of c3 and c4 represent the coordinates of the colors obtained by the item 3 of the regulation range of a signal by converting the signal values mostly linear video signal V1 indicating each of the third and fourth color signal values lying within the range of the output power W.

As can be seen also in FIG. 5, the clipping processing converts the third color (coordinate a3) and the fourth color (coordinate a4)different from each other, in the same color (the same coordinates b3 and b4) within the color gamut of the display 5, by converting the signal. On the other hand, as can be seen in FIG. 5, the processing element 3 of the regulation range of the signal converts the third color (coordinate a3) and the fourth color (coordinate a4)different from each other, in different colors (the coordinates of c3 and c4, are distinct from each other) within the color gamut of the display 5, by converting the signal.

And in addition, in FIG. 6, the coordinate a5 of the fifth color is a coordinate, at the time when the signal values (RGB) video signal are signal values (2.0, 0.8, and 0.7), including one value greater than 1. In addition, coordination is and a6 sixth color is a coordinate at the time when the signal values (RGB) video signal are signal values (1.3, 0.8, and 0.7), including one value greater than 1. In addition, the coordinates of the b5 and b6 represent the coordinates of the colors obtained by converting the signal values in the signal that indicates each fifth and sixth color signal values lying within the range of output power W by the clipping processing. In addition, the coordinates of the c5 and c6 represent the coordinates of the colors obtained by the item 3 of the regulation range of a signal by converting the signal values mostly linear video signal V1 indicating each of the fifth and the sixth color, the signal values lying within the range of the output power W.

As can be seen also in FIG. 6, the clipping processing converts the fifth and sixth color that is different from each other, in the same color (the same coordinates b5 and b6) within the color gamut of the display 5, by converting the signal. On the other hand, as can be seen in FIG. 6, the processing element 3 of the regulation range of the signal converts the fifth color, and the sixth color different from each other, in different colors (coordinates c5 and c6, are distinct from each other) within the color gamut of the display 5, by converting the signal.

And also, in FIG. 7, the coordinate a7 sed the constituent colors is a coordinate at the time when the signal values (RGB) video signal are signal values (0.7, -0.5 and-0.8), including two negative values. And also coordinate a8 eighth color is a coordinate, at the time when the signal values (RGB) video signal are signal values (0.5,-0.5,- 0.8), including two negative values. In addition, the coordinates of the b7 and b8 represent the coordinates of the colors obtained by converting the signal values in the signal that indicates each of the seventh and eighth color in the signal values lying within the range of output power W by the clipping processing. In addition, the coordinates of the c7 and c8 represent the coordinates of the colors obtained by the item 3 of the regulation range of a signal by converting the signal values mostly linear video signal V1 indicating each of the seventh and eighth color in the signal values lying within the range of the output power W.

As can be seen also in FIG. 7, the clipping processing converts the seventh color (coordinate a7) and the eighth color (coordinate a8)that are different from each other, in the same color (the same coordinates b7 and b8) within the color gamut of the display 5, by converting the signal. On the other hand, as can be seen in FIG. 7, the processing element 3 of the regulation range of the signal converts the seventh color (coordinate a7) and the eighth color (coordinate a8), different from each other, in different colors (coordinates c7 and c8, are distinct from each other) within the color gamut of the display 5 via the signal conversion.

As shown in FIG. 4-7, even when the linear primary video signal V1 is a signal indicating a color outside the color gamut of the display 5, the video display device Z may be displayed on the display 5 color video signal alternate color. In addition, the display color of the display 5 is changed in accordance with changes in the signal values of the linear primary video signal V1, so that could be ensured uniformity of color of the color display of the display 5. In short, can be prevented error gradation.

Next will be described the relationship between the color phase of the linear primary video signal V1 and one of the secondary linear video signal V2.

The relationship between the signal values (Xr, Xg, and Xb) RGB signal in the main line of the video signal V1 when the output lower limit value Smin is set to 0, and the Ycbcr signal corresponding to the RGB signal, expressed in the following formula (C1). In addition, the signal Ycber is a signal composed of a combination of luminance Y, color difference Cb base color B and color difference Cr primary color R

However, Y is the brightness value of the main signal (the signal YbCr), Cb is the color difference of the base color "B" in the main video signal (YCbCr signal), Cr is the color difference of the primary color R in the main video signal (YCbCr signal) C1, C2, and C3 are predetermined constant values.

According to the formula (C1) the ratio of the signal values Cr/Cb both color differences in the Ycbcr signal corresponding to the main line of the video signal V1, is expressed in the following formula (C2).

On the other hand, the relationship between the signal values (Yr, Yg and Yb) RGB signal in the linear secondary video signal V2 when the output lower limit value Smin is set to 0, and the Ycbcr signal corresponding to the RGB signal, expressed in the following formula (D1). In addition, the Ycbcr signal is a signal composed of

the combination of the brightness values Y', color differences Cb' primary color B and color differences Cr' primary colors R

However, the brightness value Y' of the main video signal (YCbCr signal) Cb' is a color difference between the foreground color "B" in the main video signal (YCbCr signal), Cr' is the color difference of the primary color R in the main video signal (YCbCr signal) C1, C2, and C3 are predetermined constant values.

Here is the condition when only the signal value of " X " base color "B" mostly linear video signal V1 is smaller than the output lower limit value Smin, while the signal values Xr and Xb of the other two primary colors (R and G) and intermediate brightness values (Lr, Lg and Lb) primary colors (RGB) are within range of output power W Here the signal values Xr and Xb and intermediate brightness values (Lr, Lg, Lb) do not exceed the output value upper limit Smax. In this case, the following formula (D2) can be obtained from the formulas (A1) and (A2).

Typing the formula (D2) in the formula (D1), we obtain the following formula (D3).

According to this formula (D3) the ratio of the signal values Cr/Cb both color differences in the Ycbcr signal corresponding to the secondary line signal V2 is expressed in the following formula (C4).

As you know, when the ratio of the signal values of the color difference (Cr/Cb and Cr' and Cb') of the two signals Ycbcr are consistent, the color expressed by each of these two signals Ycbcr have the same color phase. Here, it is preferable that the constant k was equal to at least 1, so that the Cr/Cb according to the formula (C2) and Cr'/Cb'according to the formula (D4), were in compliance. With regards to the above color matching phase, it also remains the same even when the combination of the signal values of the basic color is (RGB) mainly linear video signal V1 are different.

Accordingly, when the constant k is equal to 1 in the formula (A2), in many cases, when the intermediate brightness values Lr, Lg and Lb do not exceed the output value upper limit Smax, the color phase of the color indicated by the video signal can be maintained before and after the signal conversion element 3 of the regulation range of the signal. This allows, when the original color of the representations of the linear primary video signal V1 is a color outside the color gamut of the display 5, to form on the display 5 of approximately the same color as the original color.

And also the color phase can be maintained before and after conversion of the signal, based on a formula (B1), due to the constant ratio of the brightness values of the primary colors (RGB). Therefore, when the constant k in the formula (A2) is assumed to be equal to 1, and the secondary conversion rule presumably used as the conversion rule, based on a formula (B1), the color phase of the color expressed by the video signal before and after the signal conversion element 3 of the regulation range of the signal, i.e. before and after the installation of the range of signal values can be the same.

As shown above, according to the video display device Z when the signal values (Xr, Xg, and Xb) is basically a linear video signal V1 lie within the range of output power W, inanyone the video signal V1 becomes directly a secondary linear video signal V2. Therefore, the original color of the nonlinear primary video signal V1' and the display of the linear primary video signal V1 is exactly the display 5.

In addition, the video display device Z with respect to each of the luminance of the three primary colors mostly linear video signal V1 when the values (Xr, Xg, and Xb) is less than the output lower limit value Smin, i.e., when the gradation level is negative, the negative gradation level of the existing primary color changing positive gradation levels of the other two primary colors, in accordance with its absolute value. Therefore, according to the video display device Z, when the nonlinear primary video signal V1' and the linear primary video signal V1 indicating the color of the area outside the color gamut of the display 5, and when at least the level of the gradation signal is negative, in many cases, when the intermediate brightness values (Lr, Lg, Lb) do not exceed the output value upper limit Smax, can be ensured uniformity of color in the area outside the color gamut of the display 5. That is, there can be prevented the error gradation. Especially, when the constant k is equal to 1 in the formula (A2) and when the original color display linear primary video signal V1 is a color outside the color gamut of the display 5, color with black the starting phase, the same as the original color, can be formed in the display 5. In addition, performing conversion processing of the video signal Converter of the signal Q can be implemented in a simple four arithmetic operations based on the signal values of each primary color (RGB).

However, the intermediate brightness values Lr, Lg and Lb of each primary color (RGB) can rarely exceed the output value of the upper limit. In this case, when the linear secondary video signal V2 is produced by compression of the interim luminance values (Lr, Lg and Lb), in accordance with the formula (B1), the color phase of the linear primary video signal V1 may also be supported in the linear secondary video signal V2 on the site, outside of the color gamut of the display 5.

With respect to the two signals before and after signal conversion, as mentioned above, the color scheme can be compressed, when the color difference signal corresponds to the ratio of Cr/Cb during the display of the source video, Ycbcr signal and color difference signal ratio Cr'/Cb', while displaying the converted video signal, so that the color phase can be maintained. However, in the case of Ycbcr signal for compressing the color gamut to ensure that the Cr/Cb=Cr'/Cb', for example, the following procedure requires the calc is to merge the converted video.

For starters θ, presumably, is defined as θ=arctan (Cr/Cb)=arctan(Cr'/Cb'), and in respect of its colour phase θ, the color scheme is determined based on a formula (D1) so that the signal of the RGB values did not exceed the range of output power. Then color within the specified color, i.e. the color display of the converted signal Ycbcr determined in accordance with a predefined rule.

However, during the conversion of the signal processing in the process described above, it is necessary to perform the operation of complex trigonometric functions and operation of the dual solution of the linear equation, increasing, thus, the arithmetic complexity.

On the other hand, according to the Converter Q video, simple processing conditions are evaluated, along with the four arithmetic operations as shown in formulas (A1), (A2), (B1) and (B2)allows you to perform conversion processing of the signal is low arithmetic complexity.

Then, in accordance with reference to the flowchart shown in FIG. 2, the described device Z' video display, as an application example Z video display. In addition, the components in FIG. 2, the same as Z video display shown in FIG. 1, shown with the same numbers.

In the Converter Q video signal in the video display device Z, the main videosin the l before installing the range of signal values, before converting the signal is a linear signal (linear primary video signal V1, which is that the nonlinear primary video signal V1'as the video signal corresponding to IEC 61966-2-4 and IEC 61966-2-1, subjected to gamma processing element 2 gamma processing the main part.

Moreover, the Converter Q video secondary video signal, after adjusting its range of signal values is a linear signal, in other words, the linear secondary video signal V2, because of the nonlinear signal obtained using the gamma of the video signal processing element 4 gamma processing the secondary side, i.e. the nonlinear secondary video signal V2' is a video signal compliant with the standards, such as ITU-R BT.709 and ITU-R BT.601-5.

This prevents deterioration of the picture quality, which could occur when non-linear video signal subjected to linear processing, even when the formula (A2) and (B1) are used as a simple linear formula to convert the signal.

On the other hand, the device Z' video display contains, in place of the transducer signal Q in the video display device Z, the Converter Q' video, in which the element 2 gamma processing of the primary side and the element gamma processing secondary side 3 are removed from the transformed is the Converter of the signal Q. Briefly, the transducer Q' video contains the element 1 generate a signal RGB and the item 3 of the regulation of the signal range.

Item 3 of the regulation signal range of the Converter Q' video first computes intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB). Here the intermediate brightness values (Lr, Lg and Lb are brightness values of each primary color (RGB), which can be obtained by the use (purpose) of the signal values of the brightness of each primary color (RGB) in the nonlinear primary video signal V1', generated by the element generate a signal RGB 1 in the formulas (A1) and (A2). In addition, the Converter Q' video for this processing is one example of a transmitter intermediate brightness values. In addition, the Converter Q' video signal brightness values (Xr, Xg, and Xb) primary colors (RGB) in the "main video" in the formulas (A1) and (A2) are the signal values of the brightness of each primary color (RGB) in the nonlinear primary video signal V1'.

Moreover, item 3 of the regulation signal range of the Converter Q' signal produces a nonlinear secondary video signal V2' (one example of a secondary element of the production of the video), when the intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) include himself is, greater than the output value of the upper limit Smax, in other words, when executed by one or more of three conditions: "Lr>Smax", "Lg>Smax" and "Lb>Smax". Nonlinear secondary video signal V2', produced here, is a signal value obtained by converting the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB) values that are within range of output power W by secondary transformation rules.

Here, as a pre-defined secondary conversion rules, for example, can be the conversion rules in accordance with the following formulas (B1) and (B2). In addition, the Converter Q' video signal brightness values (Yr, Yg and Yb) primary colors (RGB) in "secondary video" in accordance with formulas (B1) and (B2) are the signal values of the brightness of each primary color (RGB) in a nonlinear secondary video signal V2'.

As already mentioned, the Converter Q' video main video before installing the range of its signal value represents a video signal corresponding to IEC 61966-2-4 and IEC 61966-2-1, briefly, is the nonlinear primary video signal V1'.

Moreover, the Converter Q' video nonlinear secondary video signal V2'as the secondary video signal after setting range e what about the signal values, is the video signal, the relevant standards, such as ITU-R BT.709 and ITU-R BT.601-5.

Like the Converter Q video signal when the signal transformation performed using linear formulas, such as formulas (A1) and (B1) in the nonlinear primary video signal V1', deterioration of image quality cannot be avoided completely, however, can get a great effect of reducing the arithmetic complexity skipping two gamma-ray treatments. This Converter Q' signal, and the Z' video display containing it, is one example of a variant of implementation of this invention.

The processing for calculating the above formula (A1) or (A1') and formula (A2) is a treatment for the replacement and additions, as shown below, when one or more signal brightness values (Xr, Xg, and Xb) of each primary color (RGB) in the primary video signal, including a minimum value less than the output lower limit value Smin. In short, the processing of the replacement need to replace the signal value less than the output lower limit value Smin in the primary video signal, the output value lower limit Smin. Processing additions are needed to summarize the complementary positive value proportional to the difference between the output value lower limit Smin and the value is of the signal, less than the output lower limit value Smin, the signal values of the other two primary colors other than the signal values that are lower than the output lower limit value Smin in the main video. Here, the coefficient of proportionality is k. This processing is a conversion processing to replace, if the gradation level of the color negative, the negative gradation level positive level gradations of color complementary color. Further, this processing is referred to as "complementary color conversion processing.

And then, in the above embodiment, when the signal intensity values of the three primary colors in the main video signal includes two or more signal having a value less than the output lower limit value, i.e. have a negative gradation level, the complementary color conversion processing is performed for each of the two or more primary colors.

However, the complementary color conversion processing only for the minimum value among multiple values with a negative gradation in the main video, may cause the lack of existence of primary colors having the negative level of gradation In this case, in terms of color, in addition to the color negative gradation level, there is no need for complementary color conversion processing for negative gradation level.

In addition, when the gradation levels of all three primary colors of the main video signal is negative, the complementary color conversion processing is performed only for the two primary colors, having a smaller gradation, and when there is no primary color negative gradation level, the same way there is no need to perform the complementary color conversion processing for all three primary colors.

Here, item 3 of the regulation signal range of the Converter Q signal can perform the processing at steps S1 to S3, as will be described below, when the signal intensity values (Xr, Xg, and Xb) of each primary color (RGB) in the primary video signal includes a value less than the output lower limit value Smin.

[Step S1]

To set the output lower limit value Smin to the signal values of the color having the minimum basic signal value Xmin, when the minimum basic signal value Xmin, the minimum value among all of the signal values (Xr, Xg, and Xb), in the main video signal is less than the output lower limit value Smin. Moreover, execute the ü processing for setting the signal value, obtained by summing the complementary positive values {k x (Smin-Xmin)}, is proportional to the difference between the output value lower limit Smin and minimum basic signal value Xmin, the signal value of two colors other than the primary minimum signal value Xmin in the main video signal, as the signal values of the other two colors, so that the intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) can be calculated (one example of temporal processing for calculating brightness values). Further, the processing performed in this step S1, referred to as the conversion processing of the first complementary color. The formula expressing the processing at step S1, is the following formula (F1).

In the formula (F1):

Smin is the output value lower limit (lower limit value of each of the luminance signal in a secondary video)

The value of Xr is the value of the luminance signal R in the main video

The value of Xg - value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, m, y, Xr', Xg', Xb', Xmin - variables

k is a constant (however, o<k)

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

More about the Isan example of processing for calculating the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB) based on the formula (F1).

For example, when the minimum basic signal value Xmin, the minimum value among all of the signal values (Xr, Xg, and Xb) in the primary video signal is equal to Xg, briefly, when Xmin=Xg, the calculation results of the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB), based on a formula (F1), will be as follows.

When the minimum value Xg among all of the signal values (Xr, Xg, and Xb) in the primary video signal is less than the output lower limit value Smin, the output lower limit value Smin, is set as an intermediate brightness value Lg, as the signal value for the color G with minimum basic signal value.

Moreover, the signal values obtained by summing the complementary positive values {k×m (however, m=Smin-Xmin)}, is proportional to the difference between the output value lower limit Smin and minimum basic signal value Xg (=Xmin), with the signal value Xr and Xb of two colors other than the primary minimum signal values of Xr in the main video signal is set as an intermediate brightness values Lr and Lb of the other two colors R and B.

The above is no different, even if the dependence of the values of the signal values of each color are different.

When the intermediate brightness values (Lr, Lg Lb) of each primary color (RGB), obtained by the processing at step S1 that do not include a value less than the output lower limit value Smin, process for the production of the secondary video signal, based on the above-mentioned interim luminance values (Lr, Lg, and Lb) of each primary color (RGB). I.e. processing is performed according to the circumstances, regardless of include whether intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) value greater than the output value upper limit Smax.

[Step S2]

On the other hand, after processing the first complementary color conversion (S1), when the minimum value L1min among the signal values of L11, L12 and L13 each primary color (RGB)obtained by the processing, are less than the output lower limit value Smin, item 3 of the regulation signal band performs conversion processing of the second complementary color, as will be described below. Further, signal values, L1, L12, and L13 are referred to as first converted complementary color signal values, and the minimum among them is L1min referred to as the first minimum of the transformed complementary color signal value.

Conversion processing of the second complementary color sets the output lower limit value Smin d the I signal of the color values, having minimum converted signal value L1min complementary colors, and at the same time, sets the value for the signal values of two other colors mentioned the value obtained by summing the complementary positive values {k x (Smin-L1min)}, is proportional to the difference between the output value lower limit Smin and the first minimum converted complementary color signal value L1min, with the signal values of two colors other than the minimum converted signal value L1min complementary color among the converted signal values L11, L12 and L13 of the first complementary color of the obtained conversion processing of the first complementary color (S1). This perform conversion processing of the second complementary color finds intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB). This calculation processing is one example of the processing for calculating the temporary brightness values.

The following formula (F2) shows a series of processing of step S1 and the step S2.

In the formula (F2):

Smin is the output value lower limit (lower limit value of each of the luminance signal in a secondary video)

The value of Xr is the value of the luminance signal R in the main video

the value Xg - the value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, c1, m, m1, y, y1, Xr', Xg', Xb' - variables

L1r, L1r', L1g, L1g', L1b and L1b', Xmin, L1min - variables

k is a constant (however, o <k)

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

In addition, L1r, L1g, and L1b in the formula (F2) correspond to the Lr, Lg and Lb in the formula (F1).

The following describes one example of processing for calculating the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB), based on a formula (2).

For example, when the minimum value L1min among the converted signal values L1r, L1g, and Lb of the first complementary color of each primary color (RGB)obtained conversion processing of the first complementary color is red signal value L1r, the result of the calculation of the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB), based on a formula (F2), following.

In this case, the output lower limit value Smin is set to red intermediate brightness values Lr, is the same as for minimum color converted signal value L1min first complementary color.

In addition, the signal values, which are such that the complementary positive value of {k×c1 (however, c1=Smn-L1r)} is proportional to the difference between the output value lower limit Smin and transformed the minimum signal value L1r (=L1min) of the first complementary red, summed with the mentioned signal value of the first complementary color L1g and L1b two colors other than the minimum of the transformed signal values of the first complementary color L1r, set for intermediate brightness values of Lg and Lb of each of the other two colors G and B.

The above is no different, even if the dependence of the values of the signal values of each color are different.

When the intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB)obtained by the processing at step S2, do not include a value less than the output lower limit value Smin, the processing for the production of the secondary video signal, based on the above-mentioned interim luminance values (Lr, Lg, and Lb) of each primary color (RGB), is performed. I.e. processed, as appropriate, depending on whether the intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) value greater than the output value upper limit Smax.

[Step S3]

On the other hand, after the conversion processing of the first complementary color (S1) and conversion processing of the second complementary color (S2), when the minimum value L2min among signal values L21, L22 and L23 each primary color (RGB)obtained by this processing is smaller than the output value lower before the La Smin, item 3 of the regulation signal band performs conversion processing of the third complementary color as will be described below. Further, the signal values L21, L22 and L23 are called transformed signal values of the second complementary color, and the minimum among them the value L2min is the minimum of the transformed signal value of the second complementary color.

Transformational processing of the third complementary color sets the output lower limit value Smin for the signal values of the color having the minimum converted signal value L2min second complementary color, and at the same time, sets the value for the signal values of two other colors mentioned the value obtained by summing the complementary positive values {k x (Smin-L2min)}, is proportional to the difference between the output value lower limit Smin minimum and the converted signal value L2min second complementary color L2min, with the signal values of two colors other than the minimum converted signal value L2min second complementary color among the converted signal values of the second complementary color L21, L22 and L23, the obtained conversion processing (S2) of the second complementary C the ETA. This perform conversion processing of the third complementary color finds intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB). This calculation processing is one example of the processing for calculating the intermediate brightness values.

The following formula (F3) shows a series of processing stages S1, S2 and S3.

In the formula (F3):

Smin is the output value lower limit (lower limit value of each of the luminance signal in a secondary video)

The value of Xr is the value of the luminance signal R in the main video

The value of Xg - value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, c1, m, m1, y, y1, Xr', Xg', Xb' - variables

L1r, L1r', L1g, L1g', L1b and L1b', Xmin, L1min - variables

L2r, L2r', L2g, L2g', L2b, L2b', L2min - variables

k is a constant (however, o <k)

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

In addition, L1r, L1g, and L1b in the formula (F3) correspond to the Lr, Lg and Lby in the formula (F1), while L2r, L2g, L2b in the formula (F3) correspond to the Lr, Lg and Lby in the formula (F2).

The following describes one example of processing for calculating the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB)based on the formula (F3).

For example, when the minimum value L2min cf the di transformed signal values of the second complementary color L2r, L2g, L2b each primary color (RGB)obtained by using conversion processing of the second complementary color is blue signal value L1b, the result of the calculation of the interim luminance values (Lr, Lg, and Lb) of each primary color (RGB)based on the formula (F3), following.

In this case, the output lower limit value Smin is set to blue provisional values Lba brightness is the same as for minimum color converted signal value L2min second complementary color.

In addition, the signal values obtained by summing the complementary values {k×y2 (however, y2=Smin-L2b)}, is proportional to the difference between the output value lower limit Smin, and blue minimum converted signal value L2b (=L2min) of the second complementary color, with a transformed signal values L2g and L2b of the second complementario color of two colors other than the minimum of the transformed signal values L2r second complementary color set for the interim luminance values Lr and Lg each of the other two colors R and g

The above is no different, even if the dependence of the values of the signal values of each color are different.

When the intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB)obtained by the processing at step S3, do not include himself is, less than the output lower limit value Smin, process for the production of the secondary video signal, based on the above-mentioned interim luminance values (Lr, Lg, and Lb) of each primary color (RGB). I.e. processing is performed according to the circumstances, regardless of include whether intermediate brightness values (Lr, Lg, and Lb) of each primary color (RGB) value greater than the output value upper limit Smax.

In addition, the following formulas (F1'), (F2') and (F3') respectively correspond to the formulae (F1), (F2)and (F3), when the output range from 0 to 1 (Smin=0 and Smax=1) and when each signal value (Xr, Xg, and Xb) in the primary video signal is normalized in accordance with the above range of output power from 0 to 1.

In the formula (F1'):

The value of Xr is the value of the luminance signal R in the main video

The value of Xg - value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, c1, m, m1, y, y1, Xr', Xg', Xb' - variables

L1r, L1r', L1g, L1g', L1b and L1b', Xmin, L1min - variables

k is a constant (however, o<k)

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

In the formula (F2'):

The value of Xr is the value of the luminance signal, R is the main video

The value of Xg - value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, c1, m, m1, y, y1, Xr', Xg', Xb' - variables

L1r, L1r', L1g, L1g', L1b and L1b', Xmin, L1min - variables

k is a constant (however, o<k)

Lr-R intermediate brightness value

Lg-G intermediate brightness value

Lb-B intermediate brightness value

In the formula (F3'):

The value of Xr is the value of the luminance signal R in the main video

The value of Xg - value of the luminance signal G in the main video

The value of the Xb - value of the brightness signal B in the main video

c, c1, m, m1, y, y1, Xr', Xg', Xb' - variables

L1r, L1r', L1g, L1g', L1b and L1b', Xmin, L1min - variables

L2r, L2r', L2g, L2g', L2b, L2b', L2min - variables

k is a constant (however, o <k)

Lr - R intermediate brightness value

Lg - G intermediate brightness value

Lb - B intermediate brightness value

According to the above processing, the intermediate values of the brightness of each primary color (RGB) are protected from increasing unnecessarily. As a result, the change (increase) the brightness (luminance) video, caused by conversion of the signal from the main signal to the secondary video signal can be minimized.

In addition, in a state in which the Converter Q video carries out processing on S3, can be obtained the same signal processing on the basis of formula (A1) or (A1') and (A2).

In addition, when the converted signal values L11, L12 and L13 of the first complementary color of the obtained conversion processing of the first complementary color (S1), include a value less than the output lower limit value Smin, can be performed clipping processing to replace the values of the output value lower limit Smin, in order to carry out processing for the production of the secondary video signal. In this case, is not carried out conversion processing of the second complementary color (S2) and converting the processing of the third complementary color (S3).

Similarly, when the converted signal values L21, L22 and L23 of the second complementary color of the obtained conversion processing of the second complementary color (S2)include a value less than the output lower limit value Smin, can be performed clipping processing to replace the values of the output value lower limit Smin, in order to carry out processing for the production of the secondary video signal. In this case, is not carried out conversion processing of the third complementary color (S3).

The present invention can be used for signal transducer and device videodisc what I containing it in order to convert the video signal of the primary side in the video signal of the secondary side so that its signal value could be within the prescribed range.

1. The video Converter for converting a primary video signal composed of luminance of each primary color (RGB)that may obtain a signal value within a wide range, partially includes an output range from a predetermined output value lower limit to the output upper limit value, the secondary video signal as a video signal intended for entry in the prescribed element of the video display, and composed of the luminance signal of each primary color (RGB)that may obtain the value in the output range that contains:
the transmitter intermediate brightness values, which computes intermediate values of brightness of each primary color (RGB), by using conversion processing of the first complementary color for setting the output value lower limit on the signal value of the color having the minimum basic signal value when the minimum basic signal value as the minimum value among the signal values of the brightness of each primary color (GB) in the main video less than the output lower limit value, and at the same time, the signal values of other two primary colors, sets a value obtained by summing the complementary positive value proportional to the difference between the output value of the lower limit and the minimum basic signal value from signal values of two primary colors other than the primary minimum signal values in the main video, and
item generation of the secondary video signal, which produces a secondary video signal composed of signals having values obtained by converting the interim luminance values of each primary color (RGB) values within the output range in accordance with a predefined mapping rule, when the intermediate values of the brightness of each primary color (RGB) include a value greater than the output value of the upper limit; and the secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the intermediate values of the brightness of each primary color (RGB) do not include the value greater than the output value of the upper limit.

2. Converter video signal according to claim 1, in which the transmitter intermediate values I have bone calculates intermediate values of brightness of each primary color (RGB), introducing, in addition to the conversion processing of the first complementary color conversion processing of the second complementary color for setting the output value lower limit on the signal value of the primary color having the minimum converted signal value of the first complementary color, when the minimum converted signal value of the first complementary color, as the minimum value of the converted signal values of the first complementary color signal values of each primary color (RGB), which can be obtained from conversion by processing the first complementary color, less than the output lower limit value, and at the same time, the signal values of other two primary colors, setting a value obtained by summing the complementary positive value proportional to the difference between the output value of the lower limit and the minimum of the transformed signal value of the first post-complementary color signal values of two primary colors other than the minimum of the transformed signal values of the first complementary color in the transformed signal values of the first complementary color.

3. Converter video signal according to claim 2, is where the transmitter intermediate brightness values calculates intermediate values of brightness of each primary color (RGB), introducing, in addition to the conversion processing of the first complementary color and converting the processing of the second complementary color conversion processing of the third complementary color for setting the output value lower limit on the signal value of the primary color having the minimum converted signal value of the second complementary color when the minimum of the transformed signal value of the second complementary color, as the minimum value of the converted signal values of the second complementary color signal values of each primary color (RGB), which can be obtained conversion processing of the second complementary color, less than the output lower limit value, and at the same time, the signal the values of other two primary colors, setting the value obtained by summing the complementary positive value proportional to the difference between the output value of the lower limit and the minimum of the transformed signal value of the second post-complementary color signal values of two primary colors other than the minimum of the transformed signal values of the second complementary color in the transformed signal values of the second to elementarnogo color.

4. The video Converter for converting a primary video signal composed of luminance of each primary color (RGB)that may obtain the signal value in the extended range, partially includes an output range from a predetermined output value lower limit to the output upper limit value, the secondary video signal as a video signal intended for entry in the prescribed element of the video display, composed of the luminance signal of each primary color (RGB)that may obtain the value in the output range that contains:
the transmitter intermediate brightness values, which computes intermediate values of brightness of each primary color (RGB), which can be obtained by using the signal values of the brightness of each primary color (RGB) in the main video in the following formulas (A1) and (A2), and

in the formulas (A1) and (A2):
Smin is the output value lower limit (lower limit value of each of the luminance signal in a secondary video),
the value of CG - value of the brightness signal R in the main video,
the value of Xg - value of the luminance signal G in the main video,
the value of the Xb - value of the luminance signal In a primary video,
C, m, y, Xr', Xg', Xb' - variables
k - constant is I (however, 0<k),
Lr-R intermediate brightness value,
Lg-G intermediate brightness value,
Lb-B intermediate brightness value,
item generation of the secondary video signal, designed to produce the secondary video signal composed of signals having values obtained by converting the interim luminance values of each primary color (RGB) values within the output range in accordance with a predefined mapping rule, when the intermediate values of the brightness of each primary color (RGB) include a value greater than the output value of the upper limit; and the secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the intermediate values of the brightness of each primary color (RGB) do not include a value greater than the output value of the upper limit.

5. Converter video signal according to claim 4, in which the constant k is equal to 1 in the formula (A2).

6. Converter video signal in accordance with any of claims 1 or 4, in which a predetermined conversion rule in the element formulation of the secondary video signal is to replace the largest value in the intermediate brightness values output value of the upper limit, at the same time squeezing other intermediate brightness values, based on the ratio determined in accordance with the value of the highest value in the intermediate brightness values.

7. Converter video signal in accordance with any of claims 1 or 4, in which a predetermined conversion rule in the element formulation of the secondary video is to compress all intermediate values of brightness of each primary color (RGB) in accordance with the ratio between the width of the range of the output value lower limit to the highest value in the interim luminance values of each primary color (RGB) and the width of the output range.

8. Converter video signal in accordance with any of claims 1 or 4, in which the main video signal is a video signal corresponding to IEC 61966-2-4 or IEC 61966-2-1 or the video signal subjected to the gamma processing.

9. Converter video signal in accordance with any of claims 1 or 4, in which the secondary video signal or a signal obtained by gamma processing of the secondary video signal is a video signal corresponding to the standard ITU-R BT.709 or ITU-R BT-5.

10. The video Converter for converting a primary video signal composed of luminance of each primary color (RGB)that may obtain the signal value in the extended is the range, as the range of normalized values from negative values to values larger than 1, the secondary video signal which is a signal intended for entry in the prescribed element of the video display, and composed of the luminance signal of each primary color (RGB)that may obtain the value in the output range, as a normalized value from 0 to 1, containing:
the transmitter intermediate brightness values, which computes intermediate values of brightness of each primary color (RGB), which can be obtained through use of the signal values of the brightness of each primary color (RGB) in the main video in the following formulas (A1') and (A2), and

in formulas (A1') and (A2):
the value of CG - value of the brightness signal R in the main video,
the value of Xg - value of the luminance signal G in the main video,
the value of the Xb - value of the luminance signal In a primary video,
C, m, y, Xr', Xg', Xb' - variables
k is a constant (however, 0<k),
Lr-R intermediate brightness value,
Lg-G intermediate brightness value,
Lb-B intermediate brightness value,
item generation of the secondary video signal, which produces the secondary video signal composed of signals obtained through conversion of the interim luminance values of each of the VI is x color (RGB) values, within the output range in accordance with a predefined mapping rule, when the intermediate values of the brightness of each primary color (RGB) include a value greater than 1; and the secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the intermediate values of the brightness of each primary color (RGB) do not include a value greater than 1.

11. The video display device containing a transducer signal in accordance with any of claims 1, 4 or 10 and the video display element for displaying a video image based on the secondary signal produced by the video Converter.

12. The way to convert the video signal to convert the primary video signal composed of luminance of each primary color (RGB)that may obtain the signal values in the extended range, partially includes an output range from a predetermined output value lower limit to the output upper limit value, the secondary video signal as a video signal intended for entry in the prescribed element of the video display, composed of the luminance signal of each primary color (RGB)that may obtain values in the output range, which soderjaschegosya stages, are:
through prescribed processor
process for calculating the intermediate brightness values in order to calculate intermediate values of the brightness of each primary color (RGB), carrying out conversion processing of the first complementary color to replace the minimum basic signal value of the output value lower limit, when the minimum basic signal value as the minimum value among the signal values of the brightness of each primary color (RGB) in the primary video signal is less than the output lower limit value, and at the same time summarize the complementary positive value proportional to the difference between the output value of the lower limit and the minimum basic signal value from signal values of the two main colors other than the primary minimum signal values in the main video, and
process for the production of the secondary video signal to form a secondary video signal composed of signals having values obtained by converting the interim luminance values of each primary color (RGB) values within the output range in accordance with a predefined mapping rule when p is megalocnus the brightness values of each primary color (RGB) include the value greater than the output value of the upper limit; and the secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the intermediate values of the brightness of each primary color (RGB) do not include a value greater than the output value of the upper limit.

13. How to convert video on section 12, in which the intermediate values of the brightness of each primary color (RGB) are calculated by means of the processing for calculating the intermediate values of brightness, introducing, in addition to the conversion processing of the first complementary color conversion processing of the second complementary color to replace the minimum converted signal value of the first complementary color output value lower limit, when the minimum converted signal value of the first complementary color, as the minimum value of the converted minimum signal values of the first complementary color obtained by adjusting the signal values of the other two primary colors that can be obtained by converting processing the first complementary colors, less than the output lower limit value, and at the same time, summing the complementary positive value, proportional what s the difference between the output value of the lower limit and the first minimum of the transformed signal is post-complementary colors, with the signal values of the other two colors other than the minimum of the transformed signal values of the first complementary color in the transformed signal values of the first complementary color.

14. How to convert video item 13, in which the intermediate values of the brightness of each primary color (RGB) are calculated in the processing for calculating the intermediate values of brightness, introducing, in addition to the conversion processing of the first complementary color and converting the processing of the second complementary color conversion processing of the third complementary color to replace the minimum converted signal value of the second complementary color output value lower limit, when the minimum converted signal value of the second complementary color, as the minimum value of the converted signal values of the second complementary color obtained by adjusting the signal values of the other two primary colors that can be obtained conversion processing of the second complementary color, less than the output lower limit value, and at the same time, summing the complementary positive value proportional to the difference between the output value of the lower p is the published by third parties and the minimum of the transformed signal value of the second post-complementary colors, with the signal values of the other two primary colors other than the minimum of the transformed signal values of the second complementary color in the transformed signal values of the second complementary color.

15. How to convert video to convert and make the main video signal composed of luminance of each primary color (RGB)that may obtain the signal values in the extended range, partially includes an output range from a predetermined output value lower limit to the output upper limit value, the secondary video signal as a video signal intended for entry in the prescribed element of the video display, composed of the luminance signal of each primary color (RGB)that may obtain values in the output range, which includes the steps are:
through prescribed processor
process for calculating the intermediate brightness values to calculate and record in the recorder of the interim luminance values of each primary color (RGB), which can be obtained through use of the signal values of the brightness of each primary color (RGB) in the main video in the following formulas (A1) and (A2), and

in formulas A1) and (A2):
Smin is the output value lower limit (lower limit value of each of the luminance signal in a secondary video),
the value of CG - value of the brightness signal R in the main video,
the value of Xg - value of the luminance signal G in the main video,
the value of the Xb - value of the luminance signal In a primary video,
C, m, y, Xr', Xg', Xb' - variables
k is a constant (however, 0<k),
Lr-R intermediate brightness value,
Lg-G intermediate brightness value,
Lb-B intermediate brightness value,
process for the production of the secondary video signal to generate and output the secondary video signal composed of signals having values obtained by converting the interim luminance values of each primary color (RGB) values within the output range in accordance with a predefined mapping rule, when the intermediate values of the brightness of each primary color (RGB) include a value greater than the output value of the upper limit; and the secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the intermediate values of the brightness of each primary color (RGB) do not include a value greater than the output value of the upper limit.

16. How preobrazovaniya for converting and outputting the primary video signal, composed of luminance of each primary color (RGB)that may obtain the signal values in an extended range, as the range of normalized values from negative values to values larger than 1, the secondary video signal as a video signal intended for entry in the prescribed element of the video display, composed of the luminance signal of each primary color (RGB)that may obtain values in the output range, as a normalized value from 0 to 1, which contains the following stages, which are:
through prescribed processor
process for calculating the intermediate brightness values to calculate and record means the record of the interim luminance values of each primary color (RGB), which can be obtained through use of the signal values of the brightness of each primary color (RGB) in the main video in the following formulas (A1') and (A2), and

in formulas (A1') and (A2):
the value of CG - value of the brightness signal R in the main video,
the value of Xg - value of the luminance signal G in the main video,
the value of the Xb - value of the luminance signal In a primary video,
C, m, y, Xr', Xg', Xb' - variables
k is a constant (however, 0<k),
Lr-R intermediate brightness value,
Lg-G intermediate Zn is an increase brightness,
Lb-B intermediate brightness value,
process for the production of the secondary video signal to generate and output the secondary video signal composed of signals having values obtained by converting the interim luminance values of each primary color (RGB) values within the output range in accordance with a predefined mapping rule, when the intermediate values of the brightness of each primary color (RGB) include a value greater than 1; and the secondary video signal composed of signals of the interim luminance values of each primary color (RGB), when the intermediate values of the brightness of each primary color (RGB) do not include the value greater than 1.



 

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125 cl, 12 dwg, 1 tbl

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EFFECT: improved mutual compatibility between coded video data of various colouration formats.

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