Method and device for calibration of colours in chamber and/or display design, and for correction of digital image colour defects

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

 

The technical field to which the invention relates.

The present invention relates to a method for color calibration of the camera and/or a display device, and to correct color defects of digital images, and in this way a digital image generated by the camera and/or the display device, regulate by adjusting the color values of a digital image camera and/or the display device. The invention also relates to a device for calibrating the color camera and/or the display device, to correct color defects of the digital image, and this device comprises equipment designed to adjust the digital image generated by the camera and/or display device for correcting color values of a digital image camera and/or the display device.

The level of technology

Correction of defects color camera or the display device, at present, is based on the representation of color in the form of three or four values in certain lighting conditions or using a shared color profiles. The white balance of the camera adjust when shooting the camera. In addition, use color profiles, which tend to produce a homogeneous representation of the colors by using the display device at a certain color temperature of light. the or the response of the camera and the display device also regulate using gamma. In addition, when color correction also use the algorithms of the manufacturer of the hardware, which is based on balancing the white, or the measurement of color temperature. The display device is divided into categories using color spaces, consisting of three or four values (for example, RGB, Lab, RGBA, RGBE or XYZ) in certain lighting conditions. After that, the color of the display device is adjusted to these values, the appropriate color profile deviation, correspond with theoretical values. Usually the color profile of the display device adjust so that when you use different devices would reach as much as possible colour reproduction. Technology sRGB is also aimed at creating a homogeneous model colors between, for example, the camera and the display device.

Currently known color correction three or four values in certain lighting conditions does not account for changes in lighting, as in currently used methods do not add information about the lighting, but the color correction performed directly on the basis of image information created by the camera or the display device. In addition, the color appearance of three or four values is relatively unclear, because in BP the two adjustment can be changed only three or four values, affecting the color.

In addition, using only the color profiles, it is impossible to ensure the correction of certain defects (associated with specific wavelengths) of the camera by calibration.

The invention

The purpose of the invention is to provide a method and device which eliminates the above disadvantages associated with currently known methods of calibration colors and color-correction. In particular, the purpose of the invention is to provide a method for color calibration and color-correction of the camera and/or the display device, which is more accurate than previously used methods, and using this method it is possible to consider changes in lighting conditions, and using this method can be used to correct defects of the camera and the display device.

The purpose of the invention is achieved by a method and device characteristics are presented in the claims.

Using the method and device in accordance with the invention first performs the color calibration of the camera or the display device. When such calibration color representation of the color, consisting of reference colors, formed on the basis of the information spectrum of the reference colors, counting from the spectra of the reference color and light spectrum by multiplying the spectra of the reference colors on the special the Tr lighting. Thus it is possible to consider the effects of lighting, using a very simple calculation. Information spectrum of the reference color and information-spectrum lighting is either known in advance data stored in the database, or the data measured during calibration. This simple color calibration is a sufficient measure in certain embodiments of the application under static lighting, for example in the provision of health care at a distance and in endoscopy. When you change the lighting color representation of the reference colors, generated from information of the spectrum of the reference colors, counting again by multiplying the spectra of the reference colors on the spectrum of the modified lighting. The spectrum of the modified illumination can either be measured in the image obtained by the shooting situation, or may represent a compilation of previously defined data from the database. Thus, it is possible to adjust color in different lighting conditions without the need for measurement of color spectra, again formed from the reference color, or retrieve data from the database. It additionally simplifies and speeds up the correction, and also allows you to form an image in real time, despite changes in lighting conditions. Due to this, the calibration time required is e for this method, can be kept very short, which allows, for example, to form the video image in real time, despite the relatively high frequency of transmission frames. This allows you to use the method, for example, with complex medical conditions in which the frame rate should normally be at least 30 images/sec

When applying the method in accordance with the present invention the color environment of the digital image is adjusted to match the lighting conditions or the required lighting conditions, using the information-spectrum lighting.

When applying the method in accordance with the invention, the color calibration of digital cameras is performed by the image of the reference color in the lighting conditions in which the known range of lighting. The color spectra of the reference color is measured in advance or they are known in advance. The defects of the color camera and the display device is determined by comparing the RGB values of the digital response of the camera with the exact and correct RGB values of the reference colors. The exact RGB value form color spectra of the reference colors and the spectrum of lighting. This method is not limited to RGB values, but it can be used in all color spaces with three or more components. This informationlibrary colors allows you to perform color correction in real time in accordance with the invention. The same method is used for display devices, but the spectral response measured in a display device. When calibrating the device display the most accurate result is obtained by measuring the response at the detector wavelength of light.

In an embodiment of the method in accordance with the invention, color calibration with digital camera or the display device begins with the measurement of a spectrum lighting or select spectrum lighting from the database. Using spectrum lighting generate accurate and correct possible color environment, for example, to the traditional RGB color space to the existing terms of photography. Final color correction is performed by changing the data of a digital camera image or the display device so that they match the generated accurate color values. Defects colors defined in the color calibration of the camera or the display device, take into account the generated color space. The generated color space for editing in accordance with the defects so that it corresponds to an optimal situations. If necessary, a digital image can be edited using the way to match different lighting conditions, which may differ from the lighting at the time of fotografer the tion, for example, the image captured using light bulbs, you can change to match the situations with daylighting.

When applying the method in accordance with the invention, the spectrum of light that is required for color calibration and color-correction of the camera or the display device, is measured using a detector wavelength of light that can be built into the camera and/or display device, or may be secured to the device, or it can be used as an external component. Identification of spectrum lighting device is performed accurately, by measuring the wavelengths of light, or the spectrum of light can be obtained from the database using the same measured characteristics of lighting, for example, using the peaks of spectrum lighting, or using the color temperature of the lighting. Deviation of light at wavelengths can be performed, for example, using gratings or filters and detection of different wavelengths, for example, using a detector line. Identification of spectrum lighting can also be made on the basis of the content of the image data, in this case, the search of some characteristics performed on image data with which the spectrum is found in the database.

In a variant of application of the method and device in accordance with Fig is taneem, the color spectra of the reference colors and the range of light measured by the detector wavelength. The spectra of the reference colors is usually defined using an external device. When determining the spectrum of the light detector wavelength may be a device installed outside of the camera or display device, or it can be integrated with a camera or a display device. The sensor of the camera itself, in some cases, can also be used to determine wavelength. The division of light on the spectrum in the detector wavelength can be realized, for example, by using filters or gratings. To keep track of wavelengths, for example, you can use the detector line. Thus, all the wavelengths of the light spectrum can be measured very accurately and reliably. Because of this, using the calibration and correction, it is possible to provide an accurate and reliable result, but also an exact match to each other different colors in different cells and display devices.

Often the view RGB colors calculated by the spectrum information of the reference colors. The RGB color space is the most commonly used method of representing colors, currently used in cameras and display devices, and therefore calibration and color correction based on this method is applicable to most currently used digital cameras and display devices. On the basis of representation of the RGB reference color, formed from the spectrum information of the reference color, the system function of the camera and/or the display device generates by subtraction or summation of the values of RGB colors or view RGB colors, generated from information reference spectrum of colors from RGB values color cameras and/or the display device. Using system function, determine the adjusted representation of the RGB color camera and/or the display device. Thus, it is possible to determine the defects in the RGB color space of the camera and/or the display device so that the base may be formed in the table represent RGB, and this table corresponds to the shape of the table represent RGB generated by the camera and/or display device, in which for each value from 0 to 255 colors R, G and has its own value system function. Thanks to this method enables you to precisely adjust the defects associated with the individual devices in the presentation of the colors RGB camera or the display device (in other words, even small deviations of some of the values 0-255 colors R, G or b). View RGB colors corresponding to the new lighting conditions, calculated by the spectrum of light and spectra of the reference colors. Using this information, the system function, obtained as rezultatiivi device, update to match the lighting conditions. The adjusted representation of the RGB camera and/or the display device is formed by summing the color values of the RGB system functions, updated based on changes in luminance for RGB color values representing colors RGB camera and/or display device. Thus, it can be corrected representation of RGB color camera and/or a display device using a very simple calculation, and in this case, the color correction can be performed very rapidly and therefore can be easily implemented in real time in practical options for use.

Brief description of drawings

Hereinafter the invention is explained in more detail with reference to the accompanying drawings, on which:

figure 1 presents the principle of the method of calibrating the color camera and/or the display device in accordance with the invention, and

figure 2 presents a schematic diagram of the correction color in real time for a color image.

Detailed description of the invention

In the method of color calibration, digital camera diagram, shown in figure 1, the reference color is removed from the camera for which you want to calibrate the colors. In this case, the reference color is generated from the table is s color test MB 24, which contain 24 different colors. The camera produces 24-bit color RGB representation of the image of the subject. Color RGB representation generated by the camera, is a table that contains the color values corresponding to the values 0-255 color components R, G and b, which were formed by the camera sensor. For color calibration of the spectra of the reference colors formed from the reference color by using a detector wave length of light, or use a previously measured reference spectra colors. In addition, the spectrum of light measured during lighting when photographing the reference colors. Measurement of spectrum lighting also perform using the detector wavelength. Using a range of lighting, receive information about how the intensity of light was separated into various wavelengths, and using this allows correction of the spectra of the reference colors so that they match the lighting conditions at the time of photographing. Representation of the RGB camera and information on all spectra are passed to the computer for color calibration of the camera. The computer can represent, for example, a microcomputer or integrated system (for example, the camera system). As the GUI interface is used foam (SDL, Simple direct layer) in VA is iante perform in accordance with figure 1. To save these images using 32-bit format to save image data, although, as stated above, the image data read in the form of 24 bits from the camera. Changing formats is implemented using the interface of the foam.

In the computer representation of the RGB colors corresponding to the representation of the RGB camera, is generated by the formatting of the spectra of the reference colors and spectra of light by multiplying the spectrum of the reference colors on the spectrum of lighting. View RGB colors, generated from information reference spectrum of colors, is a table resembling the color representation of the RGB camera, and this table shows the meaning of the colors corresponding to the elements 0-255 color components R, G and B. then the function of the system (table correction) represent RGB color camera expect from view RGB colors, the generated representation of the RGB camera and the information spectrum. Values of the correction table also save as a 32-bit representation of the RGB colors in a table that has the above form. The very end of the calibration colors represent colors RGB camera is performed by adding the values of the RGB color values (correction table) system function to the values of the RGB camera. To simplify the interface of the foam is required to form a vector of bits from neg the selected values in the table, as shown in the diagram in figure 1. Thus eliminating the overflow interface PPU. After adding the correction table, the camera generates a representation of the RGB colors from the image data generated by the sensor, and is the RGB representation corresponds to the representation of the color, measured using a detector wave length of light in the reference colors in the conditions existing at the time of photographing. Color calibration of this kind takes into account the individual defects (for example, the deviation of certain wavelengths/wavelength ranges)that occur in the device imaging camera, and, as a result, allows you to get the (correct) view color that very closely matches the representation of the colors obtained from the information of the spectrum, in addition, the color calibration of this kind with the camera always takes into account the influence of lighting, so the representation of the colors generated by the camera corresponds to the representation of the reference colors that the eye sees better than the camera is calibrated using the previously known method, despite lighting conditions.

Color calibration of the display device, simplifying the representation of the RGB colors, in principle, is that it corresponds to the color calibration of the camera when in the beginning is defined by the system function before the provision of RGB colors of the display device using the view RGB colors for the reference color, formed by the display device, and view RGB reference color based on the information spectrum. View RGB colors, formed by the display device, receive, for example, by measuring colors of the display device using the meter color or using a detector wave length of light, and with the formation of representations of RGB colors of the display device in the form of a table from a view colors on the three values obtained as the measurement result. Since the spectra of the reference colors in advance from the measured spectra of the reference colors can be simplified (often directly measured spectra of the reference color in certain lighting conditions in advance to get the reference colors), in this case there is no need again to measure the spectra of the reference colors. Spectrum lighting is measured using a detector wave length of light, and the spectra of the reference colors adjusted to match the lighting conditions at the time of calibration, as previously presented, by subtraction of the spectra of the reference color spectrum lighting. System function (table correction) represent RGB color display device formed by the RGB representation of the color of the reference color, formed by the display device, and an RGB representation of the reference colors, formed the s of the information spectrum. The color of the display device is calibrated by multiplying the color value correction table on the color values represent RGB colors formed by the display device, and in this case, the representation of the colors generated by the display device corresponds to the accurate representation of the color of the reference color, formed from the information of the spectrum.

Often it is preferable to calibrate the color camera and the display device simultaneously. Thus, it becomes possible to make the color image captured by the camera, looked as accurately as possible and were presented in a display device as a natural color. For example, the captured color reference color, in this case, have the same color on the display, as in natural conditions, regardless of the lighting conditions. The spectra of the reference colors, generated from information spectrum and the measured spectra lighting, can be used while calibrating the color camera and the display device. Therefore, only the RGB representation of the color produced by the display device, it is necessary to measure separately, while the RGB representation of the color camera is automatically generated at the time of photographing the reference colors.

Figure 2 presents a diagram depicting the principle of correction of the color digital image in real-time. The color correction is performed using a camera with a calibrated colors or the display device. The color calibration is performed, for example, in accordance with the principle presented in figure 1. In the correction of the exact RGB values are formed from the color spectra of the reference colors, and also of the light spectrum. The method is not limited to RGB values, but it can be used in any other color spaces with three or more components. Such information to the color calibration allows you to perform color correction in real time, to match the lighting. The same method is used for display devices, but the reproduction of the spectra measured, for example, using a radiometer measuring radiation device display.

Color correction of digital camera or the display device begins with the measurement of a spectrum lighting or select spectrum lighting from the database. Spectrum lighting also can be accurately measured or can be measured only by its exact characteristics, which can be used to identify the range. Spectrum lighting can also be identified on the basis of color information, or based on the content of the image. Using a range of lighting, generate accurate and, to the extent possible, the correct environment, for example, to the traditional RGB color space to the existing terms of photography. Optimal color space create way is combining the light spectrum with the spectra of reference colors, the resulting calibration colors.

Final color correction is performed by editing the image data with a calibrated color using the camera or the display device so that they match the exact color values generated in accordance with appropriate lighting. When color correcting also take into account individual color, detected by a camera or a display device, on the basis of data of the color calibration of the camera or the display device. Color defects resulting from calibration, save as a value of the RGB color space, for example, in the case of the color space, created on the basis of lighting, subtract the RGB values or type in accordance with the data to the color calibration of the camera or the display device. Form a table of RGB color space, corresponding to values 0 to 255 for each component, and in these tables represent changes corresponding to each value. Based on these changes, perform the correction of the image data, for example, by subtracting the corresponding values from the original RGB image data. This way, if necessary, can be used to edit a color image so as to match different lighting conditions, which can vary the t lighting conditions at the time of photographing, for example, an image taken with incandescent lighting. In this case, the spectrum of light that is selected, for example, by the user, is used as a spectrum lighting.

The method and apparatus in accordance with the invention for calibration or correction of the color camera and/or the display device can be implemented in many different variants that differ from the examples of the scenarios presented above. The method may also be implemented in other color spaces, in addition to the RGB color space. The method can be applied, for example, RGBE, RGBA, CMYK, YUV, YIQ, HSV, and the respective color spaces, consisting of various components. In addition, this method can be used for calibration and correction of spectral colors of the camera, as well as in the presentation of spectral images in the above-mentioned color spaces. In addition, the various stages of the method can be implemented in many different ways. Calibration and correction can also be performed by comparing the reference colors represented in a display device, or photograph, the reference color with the corresponding physical reference colors, and by adjusting the presentation device color display and camera so that they match the physical representations of the reference colors that are visible to glazedlook. This can be realized by adjusting using the light spectrum and calculate the new RGB representations of the spectra of the reference color by using the above-spectrum lighting. In addition, for example, the measurement of the spectra of the reference colors can be performed using different devices/methods that are suitable for the measurement of the spectrum. For example, the detector wavelength can be used radiometer, and the light can be divided into a spectrum using a variety of known ways, such as a prism, grating, or a different color filters, before measuring the intensity of different wavelengths of light using a semiconductor detector. In many cases, the measurement of the spectrum of the reference color is not required, as it was previously measured. In such cases, you need to determine only the range of lighting, so you can ensure representation of RGB colors of the reference color based on the information spectrum, lighting conditions, existing at the time of photography.

The invention is not limited presents the preferred option of the application, but may be varied within the framework of the idea of the invention stated in the claims.

1. A method of calibrating the color camera and/or the display device and correction of defects colors, and is this the way a digital image, formed with the camera and/or the display device, regulate by correcting color values of a digital image camera and/or the display device, wherein the digital image is generated/received by the camera and/or the display device, adjust using the database generated from the spectrum information of the reference color, and that color appearance of the database generated from the information of the spectrum of the reference colors, take into account the influence of the lighting spectrum lighting.

2. The method according to claim 1, characterized in that the representation of colors in a database generated from the information of the spectrum of the reference colors, counting from the spectra of the reference colors and the spectrum of light by combining light spectrum with the spectra of reference colors.

3. The method according to claim 1 or 2, characterized in that when changing the lighting in the database represent colors that are generated from the information of the spectrum of the reference colors, again calculated by combining the spectra of the reference colors with the spectrum of the modified illumination.

4. The method according to claim 1, characterized in that the spectra of the reference colors and/or spectrum of light corresponding to the lighting conditions at the time of photographing, measured by a detector wave length of light.

5. The method according to claim 1, and in this way the ISP is lsout color space, composed of components, wherein using the database, calculated by the spectrum information of the reference color, for regulating the color space that is generated from the component.

6. The method according to claim 5, characterized in that the database generated from the information of the spectrum of the reference colors, form the system function of the camera and/or the display device by subtracting from the color values generated by the components of the color values of the camera and/or the display device, presenting flowers, formed from the components of the information spectrum of the reference colors, and that with the help of system functions determine the adjusted components forming a color view camera and/or the display device.

7. The method according to claim 6, characterized in that the adjusted components that formed the view color camera and/or the display device, is formed by summing the values of the colors formed from components of the system function of the color values generated from the components view color camera and/or the display device.

8. The method according to claim 7, characterized in that the presentation of the colors RGB are used as representations of colors formed from components.

9. Device for calibrating the color camera and/or the display device and to correct the Def is mswb colors in digital images moreover, this device comprises equipment intended for regulation of the digital image generated by the camera and/or display device by correcting the color values of a digital image camera and/or the display device, wherein the device comprises equipment intended for the correction of digital images generated/produced using the camera and/or the display device, using the data generated from the spectrum information of the reference color, and that the device contains equipment for accounting representation of the colors of the database generated from information reference spectrum of colors, effects lighting spectrum lighting.



 

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