Device for generating light with varying colour

FIELD: physics.

SUBSTANCE: illumination system (100) comprises: a set (14) of lamps; a controller (115); a user input device (19); memory (120) which determines discrete colour points containing an ID table (121) of hue, an ID tale (122) of saturation, an ID table (123) of brightness and boundary memory (124) which determines the boundary of the colour space. Based on data (x1, x2, x3) received from the user input device and information in the memory, the controller generates colour control signals (ξ1, ξ2, ξ3) for the set of lamps. The controller compares user input data with information in the boundary memory. If the controller detects that the said point lies beyond the boundaries of the colour space, the controller calculates the replacement point on the boundary of the colour space which was determined in the boundary memory (124), and generates is control signals based on the replacement point.

EFFECT: reduced volume of memory space required.

3 cl, 3 dwg

 

The technical field of the invention

The present invention generally relates to the field of lighting. More specifically, the present invention relates to a lighting device for forming a light with variable color.

The prior art inventions

Lighting system for illumination of a variable color space is widely known. Typically, these systems contain multiple light sources, each light source emits light with a specific color corresponding to the color of different light sources are mutually different. The total light generated by the system as a whole, is the mixing of the light emitted by multiple light sources. Changing the relative intensity of different light sources can be changed General color mixing of the light.

Note that the light sources can be of different types, such as, for example, TL-lamp, halogen lamp, light emitting diode (LED), etc. In the following will be used just the word "lamp", but it is not intended to exclude LED.

As an example of the lighting system with variable color refers to the lighting system in theater. During the performance, it may be desirable to change the color of the lighting. However, also in the case of houses, shops, restaurants, hotels, schools, hospitals, etc. may be desirable to have the ability to change color is svedeniya. In the case of theatre or similar case, the colors in a typical change from the viewpoint of improvement of dramatic effects, but in other situations it may be more desirable to have a smooth and slow transitions.

As will be clear to a person skilled in the technical field, the color of light can be represented by the coordinates of the color point in the color space. In this representation the color change corresponds to the movement from one color point to another color point in the color space, or the substitution set the color point of the system. In addition, the sequence of colors corresponds to the set of color points in the color space, and this set will be listed as the route. Dynamic color change can then be specified as "movement" on this route. More generally, the dynamic change of lighting colors will be listed as "navigation" on the color space.

In a typical embodiment, the lighting system contains three lamps. Typically, these lamps are close to the red (R), close to the green (G), close to blue (B), and the system is specified as an RGB system. For each lamp, the light intensity can be represented as a number between 0 (no light) to 1 (maximum intensity). The color point can be represented by three-dimensional coordinates (ξ1, ξ2, ξ3), each coordinate is in the range from 0 to 1 corresponds to a linear manner relative intensity of one of the lamps. The color point of individual lamps can be represented as(1,0,0), (0,1,0), (0,0,1), respectively. These points describe a triangle in the color space. All the colors in this triangle will be formed by the system.

In theory, the color space can be considered as a continuum. In practice, however, the controller of the lighting system is a digital controller, capable of forming only discrete control signals. When the user wishes to navigate through the light space using a system containing such a digital controller, it can take only discrete steps in the direction of one of the coordinates. The problem is that the RGB color space is not a linear space, so that when undertaking a discrete step of a certain size along one of the coordinate axes of the color intensity, the number of color changes as perceived by the user, is not constant, but depends on the actual position in the color space.

To solve this problem were proposed other representing the color space such as CIELAB color space, where the independent variables are hue (H), saturation (S; CIELAB calculated using the formula S=saturation/lightness), brightness (B; CIELAB calculated from light). Due to perceptio the aqueous uniformity of illumination (i.e. the linear variation of the light level is also perceived by the user as a linear change in the level of light intensity), it is useful to use this option instead of brightness. However, to generalize the description, the explanation will use the parameter "brightness", whose values are also described with perceptual uniform distribution (for example, in u V Y-space, where "Y" refers to the intensity, perceptual uniform brightness distribution is the logarithm (Y)). CIELAB color space may be visible as a three-dimensional space of discrete points (3D grid). Each point in this space can be represented by the coordinates m, n, p, and at each point of the hue (H), saturation (S), brightness (B) have a specific value H (m,n,p), S(m,n,p), B(m,n,p), respectively. The user can take discrete step along any of the three coordinate axes, receiving the predetermined and constant changes in hue, saturation or brightness, respectively, until the color is within the outer boundary of the color space (color gamut). In principle, variables hue, saturation and brightness are independent of each other. However, not all combinations of possible values for hue, saturation, and brightness correspond to physically possible colors. In the state implementation level techniques the system contains three 3D-reference table for shade, saturation and brightness, respectively. Such 3D-reference tables the advantage is that it is easily possible to consider for each combination of m, n and p, corresponds or not the resulting combination of H, S and B physically possible color, and enter the Delta value in the table, if necessary. For memory cells, where the combination of H, S and B will receive as a result of physically possible colors, the table can contain a specific code, or they can contain values of another color, for example, near the boundary of the color space.

The problem, however, is that such a solution with 3D-reference tables requires a relatively large amount of memory space. In an exemplary situation, the system allows independent setting the brightness to 25 possible levels of brightness, saturation 75 levels of saturation and hue 200 possible values for hue. In this situation, the system requires 3·200·75·25=1125000 memory cells (>1 MB).

The invention helps to reduce the amount of required memory space, so you can use inexpensive microcontrollers with limited memory space. An additional aim of the invention is the provision of a more efficient method of storing color values (H,S,B)is a table that allows for simple navigation for (H,S,B)-table l is contained in permanent shade, saturation or brightness.

The invention

According to an important aspect of the present invention CIELAB-color table is stored in a more effective way of significantly reducing the required memory space. More specifically, independent one-dimensional arrays are used for hue, saturation, and brightness. In addition, additional independent arrays are used to define valid combinations of H, S and B. In the above-mentioned exemplary situation, the same functionality can be achieved with less than 36000 memory cells, which means a reduction of the required memory size is more than 30 times.

Brief description of drawings

These and other aspects, features and advantages of the present invention will be further explained by the following description with reference to the drawings, in which identical reference numbers indicate identical or similar parts, and in which:

Figure 1 schematically shows the chromaticity diagram,

Figure 2 schematically shows a block diagram of a lighting system according to the prior art,

Figure 3 schematically shows a block diagram of a lighting system according to the present invention.

Detailed description of the invention

Figure 1 schematically shows the CIE chromaticity diagram(xy). This chart choir is known, therefore, explanation will adhere to the minimum. The point (1,0), (0,0) and (0,1) indicate perfect red, blue and green, respectively, which are virtual flowers. A curve 1 represents the pure spectral color. The wavelength specified in nanometers (nm). The dashed line 2 connects the ends of the curve 1. Region 3 surrounded by the curved line 1 and the dashed line 2, contains all visible colors; in contrast to the pure spectral color curve 1 color region 3 are mixed colors, which can be obtained by mixing two or more pure spectral colors. On the contrary, every visible color can be represented by coordinates on the chromaticity diagram; the point on the chromaticity diagram will be listed as "color point".

Note that another graphical representation of the color, for example, the RGB scheme, can also be used, as will be clear to the expert in this field of technology. However, the distribution of colors in RGB space depends entirely on the device (for example, a certain RGB value will generally give different perceived colors with different tubes, each of which has a different RGB primary colors).

Preferably, the colors represented in a device-independent color space like CIELAB color space, also called the L*a*b*-color space is Stom. CIELAB space is preferable because of its perceptual uniformity. As color detection, associative associated with these color spaces, well-known specialists in this field of technology, a detailed explanation will be omitted here. Suffice it to say that these spaces have the shade (this is explained later in this document), saturation (this will be explained later in this document) and brightness (a measure of the total light intensity) as independent variables, and that the representation of the color in RGB space can be transformed into a representation of the color in the CIELAB color space or Vice versa through a matrix transformation is one-to-one.

Basic concepts of hue, saturation and brightness are most easily explained in CIE 1931(x,y)color space, although in a different color space can be obtained by other definitions. For simplicity, hereafter we use the CIE 1931 (x,y)color space.

When two pure spectral colors are mixed, the color point of the resulting mixed color is on the line connecting the color points of the two pure colors, the exact location of the resulting color point depends on the mix ratio (intensity factor). For example, when we mix purple and red, the color point of the resulting smiling the aqueous Magenta is located on the dashed line 2. Two colors are called complementary colors", if they can be mixed to create white. For example, figure 1 shows line 4 connecting the blue (480 nm) and yellow (580 nm), and this line passes through the white point, indicating that the correct ratio of the intensity of the blue light and the yellow light is perceived as white light. The same would apply for any other set of complementary colors: if the right ratio of mixing, the mixed light is perceived as white light. Note that the mixed light is actually still contains two spectral lobe at different wavelengths.

If the light intensity of the two complementary colors (lamps) are indicated as I1 and I2 respectively, the total intensity Itot mixed light is defined as I1+I2, while the resulting color will be defined as the ratio I1/I2. For example, suppose that the first color is blue with intensity I1 and the second color is yellow with intensity I2. If I2=0, the resulting color is pure blue, and the resulting color point is on curve 1. If I2 is increased, the color point moves along the line 4 to the white point. While the color point is located between pure blue and white, the corresponding color is still perceived as blue, but closer to the point is logo the resulting color is paler.

In the following, the word "color" will be used for the actual color in the area 3 in associative links with the phrase "color point". "Perception" color will be indicated by the word "hue"; in the above example, the tint is blue. Note that the shade of associative associated with spectral colors, curve 1; for each color point corresponding shade can be created by the projection of the color point on the curve line 1 along the line crossing the white point.

In addition, the fact whether the color is more or less pale shade, will be expressed by the term "saturation". If the color point is on curve 1, the corresponding color is a pure spectral color, also specified as a fully saturated hue (saturation = 1). When the color point moves to the white point, saturation decreases (less saturated hue or a more pale color); at the point of the white saturation is equal to zero by definition.

Note that many of the visible colors can be obtained by mixing two colors, but this does not apply to all colors, as can easily be seen from figure 1. To be able to create light having any desired color, you need three lamps that produce three different colors. Can be used more lamps, but this is optional.

Figure 2 schematically displays the block diagram of the lighting system 10, contains a set of 14 lamps. Set of 14 lamps contains many (here: three) lamps 12A, 12B, 12C, each with associative associated device 13A, 13B, 13C control lamp, respectively, controlled by the General controller 15. The user input device indicated by the number 19. Three lamps 12A, 12B, 12C form a light 16A, 16B, 16C, respectively, with mutually different colors of light; a typical used colors are red (R), green (G), blue (B). Instead of pure red, green, and blue lamps in a typical embodiment will radiate light, which is close to red, close to the green and close to blue, as indicated by the three sample color points C1, C2, C3 in figure 1, respectively. The total light radiated by a set of 14 lamps, indicated by the number 17; this common light 17, which is a mixture of separate lights 16A, 16B, 16C, has a color point in the triangle defined by corner points C1, C2, C3. Using system 10 may be set mixed color output mixing 17 light in any desired location in the above triangle, if it is possible to change the intensity of individual lamps 12A, 12B, 12C continuously. In a typical embodiment, however, the controller 15 is a digital controller, and the light intensity of individual lamps 12A, 12B, 12C can change only in discrete steps. In this case, the achievable color points are located along the decision is key in the color space. If the lattice is sufficiently thin confusing, the discrete nature of the steps from one point to the next point not visible to the human eye. As for color representation, it is CIELAB color space as the distance between two adjacent points of the lattice corresponds essentially equal to the difference in perceived color around the CIELAB color space.

In CIELAB color space hue, saturation and brightness can be changed independently from each other, until the color is within the boundaries of the color space. In the present invention we use a linear axis for hue, saturation, and brightness; these linear axes span the color space using cylindrical coordinates. In addition, each axis is discretized, i.e. you can only take discrete steps on each axis. These steps are modified, so the steps color (CIELAB described, for example, using the value ΔE color) along each axis perceptual uniform. Each color in this discretized color space is described by a combination of values along each of three axes of hue, saturation and brightness. Navigating the colors, which are formed in this way is in the approximate perceptual evenly spaced steps color along lines of constant hue, saturation, and brightness, while titanhotels within the boundaries of the color space.

In particular, the brightness B can vary from the minimum value Bmin (usually taken greater than 0) to the maximum value Bmax in equidistant steps. The number of possible brightness levels will be specified as NB. The size mentioned perceptual equally spaced steps will be listed as & Delta; b. Then, using the "brightness index" p, NBpossible brightness values B(p) can be expressed according to the following formula:

B(p)=Bmin+p· & Delta; b (1)

where the index p is an integer from 0 to NB-1.

You can see that & Delta; b=(Bmax-Bmin)/(NB-1). When using CIELAB-space "illumination" is used instead of "brightness"; linear increase in light is also perceived the people watching as the linear increase in brightness. To receive such distribution in other color spaces, B must be defined as the logarithm (intensity) intensity [suites] or log (flux) flux [lumen].

Similarly, the saturation S can vary from the minimum value Smin (usually zero) to the maximum value Smax (usually equal to one) with ravnovesie steps. The number of possible brightness levels will be specified as NS. The size mentioned equally spaced steps will be listed as ΔS. Then, using the "saturation index" n, NSpossible values of the saturation S(n) can be erogeny according to the following formula:

S(n)=Smin+n· ∆ S (2)

where the index n is an integer from 0 to NS-1.

It is easy to see that ∆ S=(Smax-Smin)/(NS-1).

Similarly, the hue H can vary from a suitable selected minimum value Hmin appropriate to the selected maximum value Hmax with ravnovesie steps. The number of possible brightness levels will be specified as NH. The size mentioned equally spaced steps will be listed as ΔH. Then, using the index of tint m, NHpossible values of the hue H(m) can be expressed according to the following formula:

H(m)=Hmin+m· ∆ H (3)

where the index m is an integer from 0 to NH-1.

You can easily see that ∆ h=(Hmax-Hmin)/(NH-1). In CIELAB metric hue difference is used to ΔH defined around the circumference of the shade around the edge of the color space using the formula:

whereis the average of two values, the chromaticity of two consecutive colors, where ∆ H is the angular difference of shade. (Hmax-Hmin) is the metric length of the circumference of the shade along the border color space (which is calculated as the sum of the difference ΔH between successive flowers along the border).

From the above it follows that the points in the color space can be defined by the indices m, n, p, and t is et at these points can be considered as a function of three independent parameters m, n, p. Figure 2 illustrates that the device 19 user input allows the user to independently select values for m, n and p. The device 19 user input is shown as the Union of three independent devices 19H, 19S and 19B input, independently providing input values m, n, p for the controller 15. On the basis of these input values m, n, p, the controller generates a set of control signals (ξ1, ξ2, ξ3) for control devices 13A, 13B, 13C kit 14 lamps.

The above formula additionally say that (for example) the shade depends only on the index m and does not depend on other indices n and p. In practice, this is true only for some color points. However, there are color pixels, where the parameters m, n, p have values that result in a combination to a physically impossible color.

In the prior art, the problem was solved by the fact that the controller 15 is supplied with a memory 18, which contained three 3D table for hue, saturation and brightness, respectively. In figure 2 it is illustrated how the combination of three independent storage devices 18H, 18S, 18B, containing a 3D table of hue H(m,n,p), 3D table saturation S(m,n,p) and the 3D luminance table B(m,n,p), respectively. Assume that the user has set the index m in the value x1, set the index n in the value x2 and set the index p in the value of x3, then control is EP 15 takes the value H(x1,x2,x3) from table H(m,n,p) shade, takes the value S(x1,x2,x3) from table S(m,n,p) saturation, and takes the value B(x1,x2,x3) from table B(m,n,p) brightness and generates its control signals (ξ1, ξ2, ξ3) on the basis of these values. For all possible combinations of values x1,x2,x3 tables filled so that the combination of H(x1,x2,x3), S(x1,x2,x3) and B(x1,x2,x3) always corresponds physically possible color. This may mean that when two points (x1,x2,x3) and (x1,x2,x3+Δx) are compared, the hue H(x1,x2,x3) is different from the hue H(x1,x2,x3+Δx) and/or saturation S(x1,x2,x3) is different from the saturation S(x1,x2,x3+Δx). As mentioned above, this approach involves the problem that the memory 18 requires 3*NH*NS*NBmemory cells.

The solution proposed by the present invention, is illustrated in figure 3, which schematically shows a block diagram similar to figure 2, the system 100 lighting according to the present invention. Compared to the lighting system 10 in figure 2, the controller 15 has been replaced by the controller 115, and the memory 18 has been replaced by the memory 120. The memory 120 contains multiple tables. Reference number 121 specifies 1D-table shade containing NHvalues of H(m) shade. Reference number 122 specifies 1D-table saturation, containing NSvalues S(n) saturation. Reference number 123 specifies 1D-luminance table containing the NBvalues of B(p) brightness. Together, these three tables require NH+NS+NB memory cells.

When the indices n and p for saturation and brightness, respectively, remain constant, and when the index m of the hue ranges from 0 to NH-1, can be sub-bands, where the hue H(m) can not be taken from the 1D-table 121 hue, as the combination of the hue H(m) with saturation S(n) and a brightness B(p) will lead to physically impossible color.

According to an additional aspect of the present invention this problem is solved as follows: the boundary of the physically possible colors is described at each level of brightness with coordinates (Hue_bound, S_bound(Hue_bound, B_bound), B_bound). This boundary is essentially described by S_bound, which is a function only Hue_bound and B_bound, can be stored in memory using (NH*NB) memory cells. When the color (hue, saturation, brightness), which is formed by the three linear axes, is outside this limit, the saturation S is replaced by a boundary value S_bound. This can be interpreted as the projection of (H,S,B) on the boundary along a line parallel to the S-axis.

The total memory usage is now: (NH+NS+NB)+NH·NB. In the previous example with NH=200, NS=75, NB=25 this gives(200+75+25)+(200·25)=5300 memory cells. This results in reduced memory 212 times in comparison with the method of the preceding level is I technology.

Additional variant of the implementation is described as follows: when a given saturation S for a given hue is greater than the level S_bound border saturation level B_bound, but S_bound less than physically possible saturation at a lower (higher) level of brightness for the same shade, can be used saturation and brightness at the next lower (higher) level of brightness border color space, which is physically possible for a given hue. The nearest point on the boundary can be found by searching for the color point with a maximum value of brightness at the boundary of the color space, the saturation S and hue H. the Advantage of this solution is that it allows easy movement to a more saturated colors. However, this may lead to more memory usage than (NH+NS+NB)+NH·NBas S_bound is no longer a single value for each pair (Hue_bound, B_bound) parameters, but also depends on the value of the specified S. Of practice, it can be estimated that it spends approximately 0.5·2·NH·NS·NBmemory cells for replacement. This results in a reduction of memory in 3 times in comparison with the method of the prior art. Additional reduction pam is ti can be obtained through the curve, the corresponding boundary points (preferably linear interpolation) and stores these in the memory.

Each of the two methods described here, is a complete solution to find all the necessary replacement for the physically impossible colors, which are formed by the three axes for hue, saturation, and brightness.

It should be clear that these methods provide a sufficient reduction in comparison with the required memory space of the prior art.

To implement any of the methods mentioned above, the memory 120 further comprises a memory 124 of the border, containing the coordinates of the boundaries of the color space. When receiving a user input (x1,x2,x3), the controller 115 compares the coordinates (x1,x2,x3) with information about the border in the memory 124 of the border. If it turns out that the coordinates (x1,x2,x3) define a point outside the color space, the controller 115 calculates the coordinates of m(x1,x2,x3), n(x1,x2,x3)p(x1,x2,x3) replace the points on the boundary, which is defined in the memory 124 of the border.

Having approved thus corrected or entered by the user indexes, the controller 115 takes the value H(x1) H(m(x1,x2,x3)) shades of 1D-table 121 shade, takes the value S(x2) or S(n(x1,x2,x3)) saturation of the 1D-table 122 saturation, and takes the value B(x3) or B(p(x1,x2,x3)) the brightness of the 1D-table 123 brightness and forms with the ri control signals ξ1, ξ2, ξ3 on the basis of these values.

Specialist in the art should be understood that the present invention is not limited to the exemplary embodiments of the implementation discussed above, but that several amendments and modifications are possible within the scope of protection of the invention defined by the attached claims.

In the foregoing the present invention has been explained with reference to flowcharts that illustrate functional blocks of the device according to the present invention. It should be clear that one or more of these functional blocks may be implemented in hardware, where the function of such a functional block is a separate hardware components, but it is also possible that one or more of these functional blocks are implemented in software, so that the function of such a functional block is performed by one or more lines of computer software programs or programmable device such as a microprocessor, microcontroller, digital signal processor, etc.

1. The system (100) lighting to create light with variable color, containing:
set (14) lamps capable of forming the light of (17) with changing color;
the controller (115) to control the set (14) lamps;
device (19) for user input, Conn is received by the controller (15);
the memory (120)defining a discrete color point;
the controller (115) is configured to generate signals (ξ1, ξ2, ξ3) color management kit (14) lamps based on the data (x1,x2,X3)received from the device (19) for user input, and based on the information in the memory (120);
characterized in that the memory (120) contains 1D-table (121) shade containing a predefined number (NH) values (N(m)) shades, 1D-table (122) saturation, containing a predefined number (NS) values (S(n)) saturation 1D-table (123) brightness, containing a predefined number (NB) values ((R)) brightness;
the fact that the memory (120) includes a memory (124) of the border that defines the boundary of the color space;
the fact that the controller (115) is configured to compare the user input data (x1,x2,X3) with information in memory (124) boundaries to determine is whether the point specified by the coordinates of the user input (x1,x2,X3), inside or outside the boundaries of the color space;
in this case, if the controller (115) detects that the point is located within the boundaries of the color space, then the controller (115) can take the value (H(x1)) shades of 1D-table (121) shades based on the first user input coordinates (x1), take the value S(x2)) saturation of the 1D is ablity (122) saturation based on the second user input coordinates (x2), take the value (In(X3)) the brightness of the lD-table (123) brightness based on the third user input coordinates (X3) and to develop control signals (ξ1, ξ2, ξ3) on the basis of these values; and
in this case, if the controller (115) detects that the point is located outside the boundaries of the color space, then the controller (115) is able to calculate the coordinates (m(x1,x2,x3), n(x1,x2,X3), p(x1,x2,X3)) the replacement of a point on the boundary of the color space, which is defined in memory (124) border, take the value (H(m(x1,x2,x3))) shades of 1D-table (121) shades based on the first coordinates (m(x1,x2,x3)) replace, to take the value (S(n(x1,x2,x3))) saturation of the 1D-table (122) saturation based on the second coordinate (n(x1,x2,X3)) replace, to take the value of ((R(x1,x2,X3))) the brightness of the 1D-table (123) brightness based on the third coordinate (R(x1,x2,X3)) replacement and to develop control signals (ξ1, ξ2, ξ3) on the basis of these values.

2. The system according to claim 1, in which the controller (115) is configured to calculate the coordinates of the replacement, projecting user-entered coordinates on the boundary of the color space along the line of the projection, parallel to one of the axes.

3. The system according to claim 1, in which, when the saturation for a given shade more than the saturation level (S_bound) boundary at a given level (B_bound), but referred to the saturation level (S_bond) border less than is physically possible saturation at a different level of brightness with the same hue, value, saturation, and brightness are replaced with the values of saturation and brightness to near another brightness level border color space, which is physically possible for a given hue.



 

Same patents:

FIELD: physics.

SUBSTANCE: illumination device (1) comprises, for example, diodes LED (L1, L2, L3, L4) with separate emission spectra. Detectors D1, D2, D3, D4) can generate a vector of measurement signals (S1, S2, S3, S4) which represent light output of one active light emitter. Further, based on a linear relationship obtained during the calibration procedure, the characteristic value of the light output of that light emitter (L1, L2, L3, L4) is calculated using the measurement vector, wherein said characteristic value is based on the decomposition coefficient of an individual emission spectrum on basic functions.

EFFECT: improved method.

25 cl, 6 dwg

FIELD: physics.

SUBSTANCE: circuit (1) with light-emitting diodes is provided with first subcircuits, having first light-emitting diodes (11) and second subcircuits having second light-emitting diodes (13) and switches (14), in conducting states, for switching on the second light-emitting diodes (13) and switching off the first light-emitting diodes (11), and, in non-conducting states, for switching off the second light-emitting diodes (13) and switching on the first light-emitting diodes (11). Also, the first and second subcircuits have different signal characteristics, such as different minimum threshold voltage values, so as to be realised by different types of light-emitting diodes (11, 13) or using a different total number of serial light-emitting diodes (11, 13) or by adding elements with threshold voltage to the first subcircuits. The light-emitting diodes (11, 13) have different colours and can be used backlight.

EFFECT: simplification.

16 cl, 4 dwg

FIELD: physics.

SUBSTANCE: invention relates to a device for powering luminous elements, having an energy supply unit (12), a first luminous element (30), having a first colour, preferably white, a second and a third luminous element (34, 38), having a second and a third colour, preferably for adjusting the colour of the first luminous element, and a controlled switch (42), connected in series to the said third luminous element (38). Said serial connection from the said third luminous element (38) and said switch is connected in parallel to the said second luminous element (34). The energy supply device is characterised by that the said energy supply unit (12) has a third and a second output (20, 22). The said first luminous element (30) is connected to the said first lead (20) and the said second and third luminous elements (34, 38) are connected to the said second led (22), the said energy supply unit (12) is configured to provide controlled, preferably independently controlled, output signals on the said first and second leads (20, 22), and the said second and third luminous elements (34, 38) and the said energy supply unit (12) are configured in such a way that, the said third luminous element (38) emits light when the switch (42) is closed. The invention also relates to a method of powering the luminous elements.

EFFECT: fewer switches.

20 cl, 4 dwg

FIELD: physics.

SUBSTANCE: proposed illuminator 10 built around LEds comprises assemblage of LED different-colour light sources 14 to produced mixed-colour light and LED source control device to control said sources in compliance with preset values. Note here that first control data are generated by, at least, one colour transducer 22. Illuminator differs from known designs in that its incorporates device 30, 32 designed to determine the temperature of each LED light source and device 26 to compensate for preset values in compliance with second control data including LED light source temperature.

EFFECT: higher stability of operation.

20 cl, 2 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: invention relates to a light-emitting device (1) having an exciter (10) and a flat light-emitting element (20), where the exciter (10) is connected to a source (2) and a the light-emitting element (20), and where the light-emitting element (20), which has internal capacitance (21), is connected to the said exciter (10) so that the internal capacitance (21) serves as the passive output filter of the exciter (10).

EFFECT: design of a light-emitting device with smaller thickness.

10 cl, 9 dwg

FIELD: physics.

SUBSTANCE: fluorescent tube fitting device has a light-emitting diode element (4) which includes at least one electric starter element (4.1) connected to at least one phase conductor and also connected to at least one neutral wire at least through one conductor (4.2) having at least one light-emitting diode (4.3).

EFFECT: reduced need to replace fluorescent tubes in fittings and reduced electrical power consumption.

3 cl, 2 dwg

FIELD: mechanics, physics.

SUBSTANCE: device to excite electroluminescence consists of input unit connected in series with microprocessor unit, sinusoidal oscillation generator, amplitude-frequency response corrector, step-up transformer and exciting electrodes furnished with plates for the specimen to be placed there between. Note that the said exciting electrodes are optically coupled with the photo receiver connected with the ADC which, in its turn, is connected with the microprocessor unit. The latter is connected to the display unit and amplitude-frequency response corrector, while the sinusoidal oscillation generator is connected via a feedback loop with the microprocessor unit.

EFFECT: simpler design, smaller sizes, brightness correction in wide frequency range.

3 dwg

FIELD: information technologies.

SUBSTANCE: colour components are placed into cache memory, when they are properly determined after conversion of colour space. When after conversion components become indeterminate, values placed into cache memory are used instead of using default arbitrary value. Resulting system of colour editing is "stable" in meeting users expectations, protecting them from sudden failures that occur when using arbitrary values for indeterminate colour components.

EFFECT: invention provides for saving of properly determined colour components in conversion from the first into the second colour space.

16 cl, 6 dwg

FIELD: instrument making.

SUBSTANCE: invention is related to calibration of colours in chamber and/or display design. Result is achieved by the fact that digital image generated with the help of chamber and/or display design, is corrected with the help of data base formed from information of reference colours spectrum.

EFFECT: correction of colour defects in digital images.

9 cl, 2 dwg

FIELD: physics, image processing.

SUBSTANCE: invention is related to digital processing of image in process of scanning and copying, and especially to the field of colour and black-and-white text segmentation, when text is automatically extracted from scanned document. According to the present invention, method of text segmentation by colour criterion consists in performance of the following operations: initial image is broken down into non-overlapping units of pixels; new image Z is generated, in which each pixel represents corresponding unit of initial image; in process of scanning serial units are selected from initial image; classification is carried out for current unit by criterion "monochromatic/colour" in space of opposite colours; initial colour unit RGB is broken down into monochromatic units R, G and B; detector of Laplacian-Gaussian edges is applied with specified threshold T to monochromatic unit; number of edges is calculated for each pixel in Z; classification of "text/non-text unit" is performed by comparison of edge number with set threshold C; classified channels are combined, using logical operator OR.

EFFECT: provision of universal approach to preliminary processing of initial document, providing for faster printing of copy and saving of multifunctional device resources.

4 cl, 3 dwg

FIELD: information technologies.

SUBSTANCE: in color correction scheme per each tint any image which is combination of three different chroma signals is splitted into multiple ranges by tint so that colour correction may be performed by range of each tint. To prevent leaving of uncorrected peripheral range area for colour correction, colour correction procedure is performed so that correction ranges are overlapped with each other.

EFFECT: creation of colour correction procedure performed to provide possibility of true correction of all tints in image without leaving any uncorrected range.

5 cl, 4 dwg

FIELD: office equipment, in particular, system and method for correction of image during output to printing device.

SUBSTANCE: computer, with printing device connected to it, is equipped with information carrier, containing file with image, agent module, data storage module, at least one application, graphic device interface and printing device interface. Agent module is made with possible finding of new file with image on data carrier, aforementioned file containing additional information, calculations for this file of numeric index based on image data and recording of computed index together with additional file information to data storage module. Printing device driver is made with possible calculation of numeric index on basis of additional information data received in it, appropriate to calculated numeric index, and correction of image data received by it and transfer of corrected image data to printing device.

EFFECT: possible correction of image in accordance to additional information during output to printing device from various applications, installed on computer.

2 cl, 1 dwg

FIELD: printing ink production systems.

SUBSTANCE: system has first computer which can exchange data with second computer. Second computer transmits data to first computer. Data contains info on required color of ink but it doesn't obligatory has info on other required properties of ink. First computer has data base for predicting color data of ink receptions when using selected set of basic colors of ink, program for selecting receipt of ink based on data for ink required, and program for transmitting info to second computer for representing color which relates to selected receipt of ink. Second monitor has color display where indo is represented. Set of basic colors of ink can be selected on the base of other required properties of ink, for example, low cost, light resistance or chemical resistance.

EFFECT: close match of colors obtained.

15 cl, 3 dwg

FIELD: printing ink production systems.

SUBSTANCE: system has first computer which can exchange data with second computer. Second computer transmits data to first computer. Data contains info on required color of ink but it doesn't obligatory has info on other required properties of ink. First computer has data base for predicting color data of ink receptions when using selected set of basic colors of ink, program for selecting receipt of ink based on data for ink required, and program for transmitting info to second computer for representing color which relates to selected receipt of ink. Second monitor has color display where indo is represented. Set of basic colors of ink can be selected on the base of other required properties of ink, for example, low cost, light resistance or chemical resistance.

EFFECT: close match of colors obtained.

15 cl, 3 dwg

FIELD: office equipment, in particular, system and method for correction of image during output to printing device.

SUBSTANCE: computer, with printing device connected to it, is equipped with information carrier, containing file with image, agent module, data storage module, at least one application, graphic device interface and printing device interface. Agent module is made with possible finding of new file with image on data carrier, aforementioned file containing additional information, calculations for this file of numeric index based on image data and recording of computed index together with additional file information to data storage module. Printing device driver is made with possible calculation of numeric index on basis of additional information data received in it, appropriate to calculated numeric index, and correction of image data received by it and transfer of corrected image data to printing device.

EFFECT: possible correction of image in accordance to additional information during output to printing device from various applications, installed on computer.

2 cl, 1 dwg

FIELD: information technologies.

SUBSTANCE: in color correction scheme per each tint any image which is combination of three different chroma signals is splitted into multiple ranges by tint so that colour correction may be performed by range of each tint. To prevent leaving of uncorrected peripheral range area for colour correction, colour correction procedure is performed so that correction ranges are overlapped with each other.

EFFECT: creation of colour correction procedure performed to provide possibility of true correction of all tints in image without leaving any uncorrected range.

5 cl, 4 dwg

FIELD: physics, image processing.

SUBSTANCE: invention is related to digital processing of image in process of scanning and copying, and especially to the field of colour and black-and-white text segmentation, when text is automatically extracted from scanned document. According to the present invention, method of text segmentation by colour criterion consists in performance of the following operations: initial image is broken down into non-overlapping units of pixels; new image Z is generated, in which each pixel represents corresponding unit of initial image; in process of scanning serial units are selected from initial image; classification is carried out for current unit by criterion "monochromatic/colour" in space of opposite colours; initial colour unit RGB is broken down into monochromatic units R, G and B; detector of Laplacian-Gaussian edges is applied with specified threshold T to monochromatic unit; number of edges is calculated for each pixel in Z; classification of "text/non-text unit" is performed by comparison of edge number with set threshold C; classified channels are combined, using logical operator OR.

EFFECT: provision of universal approach to preliminary processing of initial document, providing for faster printing of copy and saving of multifunctional device resources.

4 cl, 3 dwg

FIELD: instrument making.

SUBSTANCE: invention is related to calibration of colours in chamber and/or display design. Result is achieved by the fact that digital image generated with the help of chamber and/or display design, is corrected with the help of data base formed from information of reference colours spectrum.

EFFECT: correction of colour defects in digital images.

9 cl, 2 dwg

FIELD: information technologies.

SUBSTANCE: colour components are placed into cache memory, when they are properly determined after conversion of colour space. When after conversion components become indeterminate, values placed into cache memory are used instead of using default arbitrary value. Resulting system of colour editing is "stable" in meeting users expectations, protecting them from sudden failures that occur when using arbitrary values for indeterminate colour components.

EFFECT: invention provides for saving of properly determined colour components in conversion from the first into the second colour space.

16 cl, 6 dwg

FIELD: physics.

SUBSTANCE: illumination system (100) comprises: a set (14) of lamps; a controller (115); a user input device (19); memory (120) which determines discrete colour points containing an ID table (121) of hue, an ID tale (122) of saturation, an ID table (123) of brightness and boundary memory (124) which determines the boundary of the colour space. Based on data (x1, x2, x3) received from the user input device and information in the memory, the controller generates colour control signals (ξ1, ξ2, ξ3) for the set of lamps. The controller compares user input data with information in the boundary memory. If the controller detects that the said point lies beyond the boundaries of the colour space, the controller calculates the replacement point on the boundary of the colour space which was determined in the boundary memory (124), and generates is control signals based on the replacement point.

EFFECT: reduced volume of memory space required.

3 cl, 3 dwg

Up!