CN100477804C - Color correction device, related system and method - Google Patents

Abstract

The present invention relates to a color correction device, a related system and a method, for example, applied between a digital image reproducing device and a projector, the projector projects a first image according to the first image data output by the digital image reproducing device, and the color correction method comprises the steps of: extracting the first image and converting it into second image data; adjusting a color value conversion matrix according to the first image data and the second image data; and using the color value conversion matrix to perform color correction on the third image data output by the digital image reproducing device to generate fourth image data for projection display by the projector. The present invention allows the projector to project an image close to the ideal color, thereby improving the deficiencies of the known projection system.

Description

Color correction device, related system and method

technical field

The present invention relates to a color correction device, a related system and a method, in particular to a color correction device, a related system and a method applied between a digital image reproduction device and a projector.

Background technique

Please refer to FIG. 1, which is a functional block diagram of a common presentation system, which mainly includes a computer system 10 and a projector 11, wherein the computer system 10 outputs the picture displayed on its own display 101 through a digital or analog video signal to the projector 11, and the projector converts it into projection light, and then displays the same picture on the projection screen as on the display 101 of the computer system 10.

However, since the display 101 of the computer system 10 is mostly a liquid crystal display or a kinescope display, its display principle is different from that of the projector 11 , so the characteristics presented in terms of color are also different. In this way, the degree of difference between the same digital image data displayed on the display 101 and the results displayed by the projector 11 can be easily recognized by ordinary human eyes. troubled.

For example, the color of some briefing contents is very important reference information, such as the design of advertising posters or fashion products. Edit until you get the color you want. However, when the picture carefully adjusted by the user is displayed by the above-mentioned known projector 11, the viewer cannot see the picture displayed on the display 101 because the display principles of the two are quite different or the color has not been corrected. The color makes the user unable to effectively realize the purpose of the briefing, and how to improve the deficiency of the above-mentioned known means in this respect is the most important purpose of the development of the present invention.

Contents of the invention

The invention relates to a color correction device, which is applied between a digital image reproduction device and a display device. The display device displays a first image according to the first image data output by the digital image reproduction device. The color correction device includes: an image sensor , which extracts the first image and converts it into second image data; and a color corrector, electrically connected to the image sensor, the digital image reproduction device and the display device, which uses the first image data and the second image data The color value conversion matrix is adjusted, and the color value conversion matrix is used to perform color correction on the third image data output by the digital image reproduction device to generate fourth image data for the display device.

According to the above technical solution, in the color correction device of the present invention, the display device performs display according to the fourth image data, and the color corrector uses the third signal transmission channel to transmit a series of preset correction image data to Display on the display of the digital image reproduction device itself, and then extract and convert the correcting images displayed on the display of the digital image reproduction device itself into a series of actual image data, and then find out the method that can convert the series of actual image data into the A series of third color value conversion matrices of image data for calibration.

According to the above technical solution, in the color correction device of the present invention, the display device is a projector, and the projector performs projection display according to the fourth image data, and the projector communicates with the color corrector through the second signal transmission channel The connection is completed, and the color corrector is connected with the digital image reproduction device through the first signal transmission channel.

According to the above technical solution, the digital image reproduction device applied to the color correction device of the present invention can be completed by a computer system or a digital laser disc player with a display, and the image sensor can be made of a charge-coupled device or a complementary metal The oxide semiconductor sensor is matched with the lens to complete.

According to the above technical solution, in the color correction device of the present invention, the first image data output by the digital image reproduction device electrically connected to it is a series of correction image data, and the color value of the correction image data is consistent with the preset A plurality of preset color values set in the color corrector are the same.

Another aspect of the present invention relates to a display system for displaying images, the display system comprising: a display device, which displays a first image according to the first image data output by a digital image reproduction device; an image sensor, which extracts the first image converting an image into second image data; and a color corrector electrically connected to the image sensor, the digital image reproduction device and the display device, which adjusts the color value according to the first image data and the second image data The conversion matrix is used to perform color correction on the third image data output by the digital image reproduction device by using the color value conversion matrix to generate fourth image data for the display device.

According to the above technical solution, in the display system of the present invention, the display device performs display according to the fourth image data, and the color corrector uses the third signal transmission channel to transmit a series of preset correction image data to the display on the display of the digital image reproduction device itself, and then extract and convert the correction image displayed on the display of the digital image reproduction device itself into a series of actual image data, and then find out the method that can convert the series of actual image data into the series of The third color value transformation matrix of the image data for correction.

According to the above technical solution, in the display system of the present invention, the display device is a projector, and the projector performs projection display according to the fourth image data, and the projector completes the process with the second signal transmission channel and the color corrector. connected, and the color corrector is connected with the digital image reproduction device through the first signal transmission channel.

According to the above technical solution, the display system of the present invention, wherein the display system is a home theater system.

According to the above technical solution, in the display system of the present invention, the image sensor can be completed by a charge-coupled device or a complementary metal-oxide-semiconductor sensor with a lens, and the first output output from the digital image reproduction device electrically connected The image data is a series of image data for correction, and the color value of the image data for correction is the same as a plurality of preset color values preset in the color corrector.

Still another aspect of the present invention relates to a digital image reproduction system for generating image data, the digital image reproduction system comprising: a digital image reproduction device that outputs first image data to a display device so that the display device displays the first image ; an image sensor, which extracts the first image and converts it into second image data; and a color corrector, electrically connected to the image sensor, the digital image reproduction device and the display device, which uses the first image data and the first image data The second image data is used to adjust the color value conversion matrix, and then the third image data output by the digital image reproduction device is used for color correction to generate fourth image data for the display device.

According to the above technical solution, in the digital image reproduction system of the present invention, the display device displays according to the fourth image data, and the color corrector uses the third signal transmission channel to transmit a series of preset image data for correction to be displayed on the display of the digital image reproduction device itself, and then the correction images displayed on the display of the digital image reproduction device itself are extracted and converted into a series of actual image data, and then found out that the series of actual image data can be converted into The third color value transformation matrix of the series of correction image data.

According to the above technical solution, in the digital image reproduction system of the present invention, the display device is a projector, and the projector performs projection display according to the fourth image data, and the projector uses the second signal transmission channel to communicate with the color correction The color corrector is connected with the digital image reproduction device through the first signal transmission channel.

According to the above technical solution, in the digital image reproduction system of the present invention, the digital image reproduction device can be completed by a computer system or a digital laser disc player with a display, and the image sensor can be equipped with a charge-coupled device or a complementary metal-oxide-semiconductor sensor. The first image data output by the digital image reproduction device is a series of correction image data, and the color value of the correction image data is the same as a plurality of preset color values preset in the color corrector .

Yet another aspect of the present invention relates to a color correction method for image display, the color correction method comprising the following steps: displaying a first image according to the first image data; extracting the first image and converting it into second image data; Adjusting a color value conversion matrix according to the first image data and the second image data; using the color value conversion matrix to perform color correction on the third image data output by the digital image reproduction device to generate fourth image data; and according to the color value conversion matrix. The fourth image data is used to display the second image.

According to the above technical solution, in the color correction method of the present invention, the step of displaying the first image is that a projector projects and displays the first image according to the first image data.

According to the above technical solution, in the color correction method of the present invention, wherein the first image data includes a series of correction image data, and the first image data has a plurality of preset color values.

According to the above technical solution, the color correction method of the present invention, wherein the series of image data for correction is generated by the digital image reproduction device or the color correction device.

According to the above technical solution, in the color correction method of the present invention, the color conversion function is a color value conversion matrix.

According to the above-mentioned technical solution, the color correction method of the present invention further includes the following steps: generating a series of preset correction image data and displaying it on the display of the digital image reproduction device itself; The calibration images displayed on the display are extracted and converted into a series of actual image data; a third color value conversion matrix that can convert the series of actual image data into the series of calibration image data is found.

The invention allows the projector to project an image close to the ideal color, thereby improving the deficiencies of the known projection system.

Description of drawings

The present invention obtains deeper understanding by following accompanying drawing and detailed description:

Figure 1 is a functional block diagram of a common presentation system.

FIG. 2( a ) is a schematic functional block diagram of the first preferred embodiment of the color correction device developed by the present invention to improve the known means.

Fig. 2(b), (c), (d), which are schematic flow charts of three preferred embodiment methods of the color correction method developed by the present invention to improve the known means.

FIG. 3( a ) is a schematic functional block diagram of the second preferred embodiment of the color correction device developed to improve the known means of the present invention.

Fig. 3(b) is a schematic flow chart of another preferred embodiment of the color correction method developed by the present invention to improve the known means.

FIG. 4( a ) is a schematic functional block diagram of a preferred embodiment of the digital image reproduction system developed by the present invention to improve the known means.

FIG. 4( b ) is a functional block diagram of a preferred embodiment of the projector system 42 developed by the present invention to improve the known means.

FIG. 4( c ) is a schematic functional block diagram of another preferred embodiment of the digital image reproduction system developed by the present invention to improve the known means.

FIG. 4( d ) is a schematic functional block diagram of another preferred embodiment of the projector system 42 developed by the present invention to improve the known means.

FIG. 5( a ) is a schematic flowchart of a method of a preferred embodiment of the color correction method developed to improve the known means of the present invention.

FIG. 5( b ) is a schematic flow chart of another preferred embodiment of the color correction method developed to improve the known means of the present invention.

Wherein, the reference signs are explained as follows:

10 Computer system 11 Projector

101 Display 20 Color correction device

21 Digital image reproduction equipment 22 Projector

201 Image sensor 202 Color corrector

210 first signal transmission channel 220 second signal transmission channel

30 The third signal transmission channel 41 Digital image reproduction system

42 Projector system 43 Digital image reproduction system

44 projector system

Detailed ways

Please refer to FIG. 2(a), which is a functional block diagram of a color correction device according to a first preferred embodiment of the present invention, wherein a color correction device 20 can be applied between a digital image reproduction device 21 and a projector 22, and the projector 22 is based on the image data output by the digital image reproduction device 21 to project a corresponding image for the user to watch. Although this embodiment uses the projector 22 for illustration, it is not intended to be limited to this, because the projector 22 can be replaced into other display devices, such as kinescope displays, liquid crystal displays, or plasma displays.

The color correction device 20 mainly includes two components, the first is an image sensor 201, and the image sensor 201 can be a charge coupled device (Charge Coupled Device, CCD for short) or a complementary metal oxide semiconductor sensor (Complementary Metal Oxide Semiconductor Sensor, CMOS for short). Sensor), and the main function of the image sensor 201 is to extract and convert the image projected by the projector 22 into image data. The second is a color corrector 202, which is electrically connected to the image sensor 201, the digital image reproduction device 21, and the projector 22. The function of the color corrector 202 is mainly based on the image data and digital output from the image sensor 201 The image data output by the image reproduction device 21 is used to adjust the color conversion function, and then use the color conversion function to perform color correction on the image data subsequently output by the digital image reproduction device 21 to generate corrected image data, and then use the projection The machine 22 projects a nearly ideal image according to the corrected image data.

The method of a specific embodiment of the present invention is described below. First, the digital image reproduction device 21 continuously generates image data to be projected and displayed by the projector 22 and passes through the first signal transmission channel 210 (for example, digital RGB signal lines or analog signal lines). RGB signal lines) are input to the color corrector 202, and then the color corrector 202 is sent to the projector 22 through the second signal transmission channel 220. In this embodiment, since the color corrector 202 cannot know the image data generated by the digital image reproduction device 21 in advance, a plurality of preset color values are preset in the color corrector 202, and then continuously monitor (monitor ) the image data sent in by the first signal transmission channel 210 to see if there is image data that meets the preset color value. And when there is an image conforming to any one of the preset color values mentioned above, the color corrector 202 can convert the image data obtained by extracting the image projected by the projector 22 from the image sensor 201 to the The actual display color value corresponding to the preset color value is retrieved, and then an ideal/actual color value pair (pair) is collected. And after a period of time, when the preset multiple preset color values in the color corrector 202 have all appeared, the color corrector 202 can collect enough ideal/actual color value pairs (pairs), and can use the multiple preset color values. The ideal/actual color value pair (pair) adjusts the color conversion function, and then the image data that is subsequently output to the color corrector 202 is color-corrected and then output to the projector 22, so that the projector 22 can project a color close to the ideal color of the image. The schematic flow chart of the above method is shown in FIG. 2( b ).

For example, N preset color values are preset in the color corrector 202, which are respectively (R1, G1, B1), (R2, G2, B2), ..., (RN, GN, BN), as follows: Matrix A indicates that when the image data sent by the first signal transmission channel 210 has an image that matches the above-mentioned color value, the color corrector 202 can find the corresponding actual display color value from the image extracted by the image sensor 201, Finally, the corresponding N actual display color values (R1', G1', B1'), (R2', G2', B2'), ..., (RN', GN', BN') can be collected, as follows Expressed in matrix A'. According to the matrix A and the matrix A', the first color value conversion matrix Ma can be derived, such that A*Ma=A', ie A=A'*Ma ⁻¹ . The color value conversion matrix Ma represents the distortion of the projection system, and to compensate for the distortion, the color value transmitted from the color corrector 202 to the projector 22 requires a second color value conversion matrix Mb to change A into A", namely A"=A*Mb, so that the ideal color is finally presented to the viewer, that is, A"*Ma=A, and because A"=A*Mb, so A*Mb*Ma=A, and then Mb= Ma ^-1 . In this way, the color values of all the pixels sent to the color corrector 202 are converted by the second color value conversion matrix Mb and then sent to the projector 22 for projection, which can effectively compensate the distortion of the system. The above-mentioned operations can be completed by a microprocessor (not shown in the figure) or other similar operation units in the color corrector 202, so it will not be described in detail here, but the second color value conversion matrix Mb follows the sampling color The number and type will vary, so the user can obtain a color value conversion matrix with different characteristics by changing the type and number of preset colors, so that it can adapt to the application of various images (such as portraits, landscapes, or commodities, etc.) .

Please refer to Fig. 2(c) again, which is a schematic flow chart of another correction method that can operate on the system as shown in Fig. 2(a). The difference from Fig. 2(b) is that the digital image reproduction device 21 can automatically The image data of the preset color value is output to the color corrector 202, for example, executed by a program, so that there is no need to wait for the random result generated by the digital image reproduction device 21, which has the advantage of faster correction speed.

In addition, the schematic flow chart shown in FIG. 2( d) is also another correction method that can operate on the system shown in FIG. 2( a ). The difference between it and FIG. The image data of the preset color value is directly output to the projector 22 for projection, and the color conversion function can also be generated through the feedback of the image sensor 201, and then the color correction can be completed in the normal display state, so that the projector 22 can project and display An image with close to ideal color.

Please refer to FIG. 3(a), which is a functional block diagram of a color correction device according to a second preferred embodiment of the present invention, where the difference from the first preferred embodiment is that the color corrector 202 can additionally transmit a third signal The channel 30 (such as a universal serial bus) transmits control signals to the digital image reproduction device 21, so that the digital image reproduction device 21 can first generate a series of image data for correction, and its color values are respectively preset in the color corrector 202. multiple preset color values, so that the color corrector 202 does not need to monitor (monitor) the image data sent in by the first signal transmission channel 210, but uses the digital image reproduction device 21 after booting into the color correction state A series of image data for correction generated by the control signal is automatically corrected, and then the second color value conversion matrix Mb is quickly adjusted; afterward, when the image sensor 201 is not in a normal display state, it will be subsequently output to The image data of the color corrector 202 is color corrected and then output to the projector 22 to project an image with correct color. Please refer to FIG. 3 (b) for the flow diagram of the correction method of this embodiment, and because the color corrector 202 of this embodiment can actively make the digital image reproduction device 21 generate preset color values for correction, except that there is no need Waiting for the result generated randomly by the digital image reproducing device 21 not only has the advantage of faster correction speed, but also the digital image reproducing device 21 and the color corrector 202 can achieve closer cooperation through the communication of control signals. In addition, the first signal transmission channel 210 and the third signal transmission channel 30 can also be implemented in a signal transmission bus specification at the same time, instead of being divided into two physical transmission lines.

The above-mentioned device is that the main body-color correction device 20 of the present invention is independently arranged outside the digital image reproduction device 21 and the projector 22, so that it can be elastically plugged and installed in different usage environments, such as being used in a home theater or desktop environment. It is also possible to integrate the color correction device 20 with the digital image reproduction device 21 or the projector 22 in a housing, such as the digital image reproduction system 41 or projector shown in Figure 4(a) and Figure 4(b). computer system 42, or even directly integrate the color corrector 202 into the software and hardware of the digital image reproduction device 21 or projector 22, as shown in Figure 4(c) and Figure 4(d), which means that the digital image reproduction The software and hardware of the system 43 or the projector system 44 complete the work of the color corrector 202, but these all belong to equivalent changes of the technical idea of the present invention.

The above-mentioned methods must be under the premise that the digital image reproduction device 43 and the image sensor 201 should have completed proper color correction before leaving the factory, so that the projector can reflect its color value more faithfully, and when the digital image reproduction device 21 fails When the color calibration is completed before leaving the factory, the device of the present invention can also provide the following two ways to complete its color calibration.

In the first way, the image sensor 201 turns to the display (not shown) of the digital image reproduction device 21 itself to extract and convert the image displayed into image data, and the color correction device 20 generates a series of correction image data, and then Through the transmission of the third signal transmission channel, it is displayed on the display of the digital image reproduction device 21 itself. In this way, through a correction mechanism similar to the above, the color displayed on the display of the digital image reproduction device 21 itself can be found. The value conversion matrix Mc is further provided as a reference when the system of the present invention performs color correction. Please refer to FIG. 5( a ) for a schematic flow chart of the above method.

And the second way is also to turn the image sensor 201 to the image displayed on the display (not shown) of the digital image reproducing device 21 itself to extract and convert it into image data, but the digital image reproducing device 21 itself generates and A series of image data for correction commonly preset by the color correction device 20 is automatically displayed on the display of the digital image reproduction device 21 itself. In this way, through a correction mechanism similar to the above, it is also possible to find out the color display to digital image reproduction The third color value conversion matrix Mc of the display of the device 21 itself provides a reference when the system of the present invention performs color correction. The schematic flow chart of the above method is shown in FIG. 5( b ).

To sum up, the present invention adds a color correction device 20 between the known digital image reproduction device 21 and the projector 22, and then utilizes its color feedback mechanism to perform color correction, as shown in Figure 2(b) or Figure 2 (c) or the steps shown in Fig. 2(d) and/or Fig. 3(b) flow charts, and if the digital image reproduction device 43 fails to complete the color correction before leaving the factory, it is necessary to perform the steps shown in Fig. 3(b) first. 5(a) or the color correction of FIG. 5(b), and then perform the correction procedure shown in the flow chart of FIG. 2(b) or FIG. 2(c) or FIG. 2(d) and/or FIG. 3(b). In this way, the projector 22 can project an image close to the ideal color, thereby improving the deficiencies of the known projection system, and achieving the main purpose of the present invention.

The digital image reproduction device 21 can be a computer system or a digital laser disc machine with a display, the image sensor can be completed by a charge-coupled device or a complementary metal-oxide-semiconductor sensor with a lens, and the projector can be a single-shot or three-shot projection machine etc. The method of the present invention can be widely applied thereto. Furthermore, although the above embodiments are described with a projector, it should be noted that the color correction mechanism of the present invention can also be applied to other environments such as home theaters. All other equivalent changes or modifications made without departing from the disclosed spirit of the present invention shall be included in the scope of the following claims.

Claims (22)

1. A color correction device, applied between a digital image reproduction device and a display device, the display device displays a first image according to the first image data output by the digital image reproduction device, the color correction device includes: an image sensor, which extracts the first image and converts it into second image data; and The color corrector is electrically connected to the image sensor, the digital image reproduction device and the display device, and adjusts a color value conversion matrix according to the first image data and the second image data, and then utilizes the color value conversion matrix to convert The third image data output by the digital image reproduction device is color-corrected to generate fourth image data for the display device. 2. The color correction device as claimed in claim 1, wherein the display device performs display according to the fourth image data. 3. The color correction device as claimed in claim 1, wherein the color corrector uses the third signal transmission channel to transmit a series of preset correction image data to the display of the digital image reproduction device itself for display, and then the digital The correction images displayed on the display of the image reproduction device are extracted and converted into a series of actual image data, and then a third color value conversion matrix for converting the series of actual image data into the series of correction image data is found. 4. The color correction device as claimed in claim 1, wherein the display device is a projector, and the projector performs projection display according to the fourth image data, and the projector completes with the color corrector through a second signal transmission channel connected, and the color corrector is connected with the digital image reproduction device through the first signal transmission channel. 5. The color correction device as claimed in claim 1, wherein the digital image reproduction device applied to it is completed by a computer system or a digital laser disc player with a display, and the image sensor is composed of a charge-coupled device or a complementary metal-oxide-semiconductor The sensor is matched with the lens to complete. 6. The color correction device according to claim 1, wherein the first image data output by the digital image reproduction device electrically connected to it is a series of image data for correction, and the color value of the image data for correction is the same as the preset The preset color values in the color corrector are the same. 7. A display system for displaying images, the display system comprising: a display device, which displays the first image according to the first image data output by the digital image reproduction device; an image sensor, which extracts the first image and converts it into second image data; and The color corrector is electrically connected to the image sensor, the digital image reproduction device and the display device, and adjusts a color value conversion matrix according to the first image data and the second image data, and then utilizes the color value conversion matrix to convert The third image data output by the digital image reproduction device is color-corrected to generate fourth image data for the display device. 8. The display system as claimed in claim 7, wherein the display device performs display according to the fourth image data. 9. The display system according to claim 7, wherein the color corrector uses the third signal transmission channel to transmit a series of preset correction image data to the display of the digital image reproduction device itself for display, and then the digital image The correction images displayed on the display of the playback device are extracted and converted into a series of actual image data, and then a third color value conversion matrix for converting the series of actual image data into the series of correction image data is found. 10. The display system according to claim 7, wherein the display device is a projector, and the projector performs projection display according to the fourth image data, and the projector is connected to the color corrector through a second signal transmission channel , and the color corrector is connected with the digital image reproduction device through the first signal transmission channel. 11. The display system of claim 7, wherein the display system is a home theater system. 12. The display system as claimed in claim 7, wherein the image sensor is completed by a charge-coupled device or a complementary metal-oxide-semiconductor sensor with a lens, and the first image output by the digital image reproduction device to which it is electrically connected The data is a series of image data for correction, and the color value of the image data for correction is the same as a plurality of preset color values preset in the color corrector. 13. A digital image reproduction system for generating image data, the digital image reproduction system comprising: A digital image reproduction device, which outputs the first image data to a display device so that the display device displays the first image; an image sensor, which extracts the first image and converts it into second image data; and The color corrector is electrically connected to the image sensor, the digital image reproduction device and the display device, and adjusts a color value conversion matrix according to the first image data and the second image data, and then utilizes the color value conversion matrix to convert The third image data output by the digital image reproduction device is color-corrected to generate fourth image data for the display device. 14. The digital image reproduction system as claimed in claim 13, wherein the display device displays according to the fourth image data. 15. The digital image reproduction system as claimed in claim 13, wherein the color corrector uses the third signal transmission channel to transmit a series of preset correction image data to the display of the digital image reproduction device itself for display, and then The correction images displayed on the display of the digital image reproduction device are extracted and converted into a series of actual image data, and then the third color value conversion matrix for converting the series of actual image data into the series of correction image data is found. 16. The digital image reproduction system as claimed in claim 13, wherein the display device is a projector, and the projector performs projection display according to the fourth image data, and the projector communicates with the color corrector through the second signal transmission channel The connection is completed, and the color corrector is connected with the digital image reproduction device through the first signal transmission channel. 17. The digital image reproduction system as claimed in claim 13, wherein the digital image reproduction device is completed by a computer system or a digital laser disc player with a display, and the image sensor is realized by a charge-coupled device or a complementary metal-oxide-semiconductor sensor with a lens. Finished, the first image data output by the digital image reproduction device is a series of correction image data, and the color values of the correction image data are the same as the preset color values preset in the color corrector. 18. A color correction method for image display, the color correction method comprising the following steps: displaying a first image according to the first image data; extracting the first image and converting it into second image data; adjusting a color value conversion matrix according to the first image data and the second image data; Using the color value transformation matrix to perform color correction on the third image data output by the digital image reproduction device to generate fourth image data; and The second image is displayed according to the fourth image data. 19. The color correction method as claimed in claim 18, wherein the step of displaying the first image is a projector projecting and displaying the first image according to the first image data. 20. The color correction method as claimed in claim 18, wherein the first image data comprises a series of correction image data, and the first image data has a plurality of preset color values. 21. The color correction method as claimed in claim 20, wherein the series of correction image data is generated by the digital image reproduction device or the color correction device. 22. The color correction method as claimed in claim 18, further comprising the steps of: Generate a series of preset image data for correction and display on the display of the digital image reproduction device itself; Extract and convert the correction image displayed on the display of the digital image reproduction device itself into a series of actual image data; and A third color value conversion matrix for converting the series of actual image data into the series of correction image data is found.

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