A method for display color correction with improved accuracy and efficiency

Abstract

The present invention relates to the field of color correction technology, and in particular to a display color correction method that improves accuracy and efficiency. The present invention adopts the following technical scheme: the color gamut diagram coordinate values ​​of 256 pure color grayscale images of the display to be tested are collected and their x, y coordinate values ​​are compared with the corresponding x, y coordinate values ​​in the standard table, and the standard table is corrected, and the corrected standard table is used to perform Gamma correction on the display to be tested. The beneficial effect of the present invention is that the efficiency of the color correction of the display can be improved while reducing the amount of calculation. At the same time, when the LUT table is recorded into the IC chip of the display, the display is connected to the host through a video line, and the LUT table is directly transcribed into the Flash chip of the display IC chip, which can further improve the efficiency of transcription after color correction.

Description

Technical Field

[0001] The present invention relates to the technical field of color correction, and in particular to a display color correction method for improving accuracy and efficiency. Background Art

[0002] At present, there are two main methods for color calibration of displays. One is that an engineer with relevant qualifications and experience visually inspects the deviation between the color of the display and the target display or standard display and makes corrections and adjustments until the visual inspection meets the requirements. This method has the problem of unstable human subjective accuracy due to the judgment by the human eye. The other is to use a color analyzer to read the color gamut coordinate values ​​of the display to be tested in the RGB value of (0,0,0)~(255,0,0) 256 pure red pictures, (0,0,0)~(0,255,0) 256 pure green pictures, (0,0,0)~(0,0,255) 256 pure blue pictures, a total of 768 pictures, and compare them with the target display or standard display. According to the deviation, repeated corrections are made and an appropriate error tolerance range is formulated to control the relative accuracy of color calibration. This method has the problem of large amount of data collection and low efficiency of color calibration due to the need for repeated corrections. Summary of the invention

[0003] The purpose of the present invention is to provide a display color correction method, and more particularly to provide a display color correction method that can effectively improve color correction accuracy and color correction efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solution: a display color correction method with improved accuracy and efficiency, comprising the following steps:

[0005] S1. Use a color analyzer to read the color gamut coordinate values ​​of 256 pure color grayscale images of the display under test with RGB values ​​of (0, 0, 0) ~ (255, 255, 255), and obtain 256 sets of color gamut coordinates: (x1, y1, Lv1), (x2, y2, Lv2), ... (x255, y255, Lv255), and take the x and y coordinate values: (x1, y1), (x2, y2), ... (x255, y255).

[0006] S2. Use the x and y coordinate values ​​in the standard table of gamma correction for the target display or standard display for color correction, recorded as: (X1, Y1), (X2, Y2), ... (X255, Y255), to compare with the x and y coordinate values ​​of the display to be tested obtained in step S1 and calculate the difference between the x and y coordinates: △xn=Xn-xn, where n=0, 1, 2, ...255; △yn=Yn-yn, where n=0, 1, 2, ...255.

[0007] S3. Use the difference between the x and y coordinates obtained in step S2 to correct the x and y coordinate values ​​in the standard table used for gamma correction of the target display for color correction or the standard display: X'n=Xn+△xn, where n=0, 1, 2, ... 255; Y'n=Yn+△yn, where n=0, 1, 2, ... 255.

[0008] S4, replacing the x, y coordinate values ​​in the standard table for gamma correction of the target display or standard display for color correction with the corrected x, y coordinate values ​​obtained in step S3, to obtain a corrected standard table for gamma correction, and performing gamma correction on the display to be tested using the corrected standard table for gamma correction.

[0009] S5, repeating steps S1 to S4 until the difference between the x and y coordinates in step S2 is less than a preset threshold range, and then the repeated gamma correction is terminated.

[0010] S6, converting the last corrected standard table for Gamma correction into a LUT table of the display and transcribing it into the liquid crystal IC chip of the display to be tested, thereby completing the color correction of the display to be tested.

[0011] Specifically, in step S6, when converting the last corrected standard table for gamma correction obtained into the LUT table of the display and transcribing it into the liquid crystal IC chip of the display to be tested, a location for storing the LUT table is first divided in the Flash chip within the liquid crystal IC chip of the display to be tested, and after the host and the display to be tested are connected via a video cable, the host converts the last corrected standard table for gamma correction obtained into the LUT table and transmits it to the display to be tested via the video cable, and the LUT table is transcribed and updated at the location for storing the LUT table in the Flash chip via the DDC / CI protocol.

[0012] The beneficial effects of the present invention are as follows: a standard table for gamma correction is corrected by using a difference compensation method, thereby reducing the amount of calculation and improving the efficiency of color correction of a display; and when a LUT table is recorded into an IC chip of a display, the display is connected to a host through a video line, and the LUT table is directly transcribed into a Flash chip of the display IC chip, thereby further improving the efficiency of transcription after color correction. DETAILED DESCRIPTION

[0013] Embodiment 1, a display color correction method for improving accuracy and efficiency, comprising the following steps:

[0014] S1. Use a color analyzer to read the color gamut coordinate values ​​of 256 pure color grayscale images of the display under test with RGB values ​​of (0, 0, 0) ~ (255, 255, 255), and obtain 256 sets of color gamut coordinates: (x1, y1, Lv1), (x2, y2, Lv2), ... (x255, y255, Lv255), and take the x and y coordinate values: (x1, y1), (x2, y2), ... (x255, y255).

[0015] S2. Use the x and y coordinate values ​​in the standard table for gamma correction of the target display or standard display for color correction, recorded as: (X1, Y1), (X2, Y2), ... (X255, Y255), to compare with the x and y coordinate values ​​of the display to be tested obtained in step S1 and calculate the difference between the x and y coordinates: △xn=Xn-xn, where n=0, 1, 2, ... 255; △yn=Yn-yn, where n=0, 1, 2, ... 255. It should be noted that the standard table for gamma correction contains the color gamut coordinate values ​​corresponding to 256 pure color grayscale images, so that the x and y coordinate values ​​in the standard table are compared with the x and y coordinate values ​​of the display to be tested and the difference is calculated, which is used to correct the standard table in the following steps.

[0016] S3. Use the difference between the x and y coordinates obtained in step S2 to correct the x and y coordinate values ​​in the standard table used for gamma correction of the target display for color correction or the standard display: X'n=Xn+△xn, where n=0, 1, 2, ... 255; Y'n=Yn+△yn, where n=0, 1, 2, ... 255.

[0017] S4, replacing the x, y coordinate values ​​in the standard table for gamma correction of the target display or standard display for color correction with the corrected x, y coordinate values ​​obtained in step S3, obtaining a corrected standard table for gamma correction, and performing gamma correction on the display to be tested using the corrected standard table for gamma correction. Generally, gamma correction is performed directly using the standard table, but this application uses the corrected standard table for gamma correction, which can effectively reduce the amount of calculation and improve the efficiency of color correction.

[0018] S5, repeating steps S1 to S4 until the difference between the x and y coordinates in step S2 is less than a preset threshold range, and then the repeated gamma correction is terminated.

[0019] S6, converting the last corrected standard table for Gamma correction into a LUT table of the display and transcribing it into the liquid crystal IC chip of the display to be tested, thereby completing the color correction of the display to be tested.

[0020] In the prior art, after completing the Gamma correction, it is necessary to reintegrate the LUT table into the program or firmware of the liquid crystal IC chip to form a new burning file, and then download the burning file to the liquid crystal IC chip through the burning tool. In the present application, specifically, in step S6, when converting the last obtained corrected standard table for Gamma correction into the LUT table of the display and transcribing it into the liquid crystal IC chip of the display to be tested, a location for storing the LUT table is first divided in the Flash chip in the liquid crystal IC chip of the display to be tested, and after the host and the display to be tested are connected through a video line, the host converts the last obtained corrected standard table for Gamma correction into the LUT table through the video line to the display to be tested, and the location for storing the LUT table in the Flash chip is transcribed and updated through the DDC / CI protocol, thereby further simplifying the burning process and improving the color correction efficiency.

[0021] Of course, the above are only preferred embodiments of the present invention, and are not intended to limit the scope of use of the present invention. Therefore, any equivalent changes made to the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for display color correction with improved accuracy and efficiency, characterized in that: The steps include: S1. Use a color analyzer to read the color gamut coordinate values ​​of 256 pure color grayscale images of the display to be tested with RGB values ​​of (0, 0, 0) to (255, 255, 255), and obtain 256 sets of color gamut coordinates: (x1, y1, Lv1), (x2, y2, Lv2), ... (x255, y255, Lv255), and take the x and y coordinate values: (x1, y1), (x2, y2), ... (x255, y255); S2, using the x and y coordinate values ​​in the standard table of the color calibration target display or the standard display for gamma calibration, recorded as: (X1, Y1), (X2, Y2), ... (X255, Y255), and comparing them with the x and y coordinate values ​​of the display to be tested obtained in step S1, and calculating the difference between the x and y coordinates: △xn=Xn-xn, where n=0, 1, 2, ... 255; △yn=Yn-yn, where n=0, 1, 2, ... 255; S3, using the difference between the x and y coordinates obtained in step S2, the x and y coordinate values ​​in the standard table for gamma correction of the target display or the standard display for color correction are corrected: X'n=Xn+△xn, where n=0, 1, 2, ... 255; Y'n=Yn+△yn, where n=0, 1, 2, ... 255; S4, replacing the x and y coordinate values ​​in the standard table for gamma correction of the target display or the standard display for color correction with the corrected x and y coordinate values ​​obtained in step S3, to obtain a corrected standard table for gamma correction, and performing gamma correction on the display to be tested using the corrected standard table for gamma correction; S5, repeating steps S1 to S4 until the difference between the x and y coordinates in step S2 is less than a preset threshold range, and then the repeated gamma correction ends; S6, converting the last corrected standard table for Gamma correction into a LUT table of the display and transcribing it into the liquid crystal IC chip of the display to be tested, thereby completing the color correction of the display to be tested.

2. A display color correction method for improving accuracy and efficiency according to claim 1, characterized in that: In the step S6, when the last corrected standard table for gamma correction obtained is converted into the LUT table of the display and transcribed into the liquid crystal IC chip of the display to be tested, a location for storing the LUT table is first divided in the Flash chip in the liquid crystal IC chip of the display to be tested, and after the host and the display to be tested are connected through a video cable, the host converts the last corrected standard table for gamma correction obtained into the LUT table and transmits it to the display to be tested through the video cable, and the LUT table is transcribed and updated at the location for storing the LUT table in the Flash chip through the DDC / CI protocol.