CN112331140B - Display screen color cast Mura repairing method and device - Google Patents
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Abstract
The invention discloses a method and a device for repairing color cast Mura of a display screen, wherein the method is used for repairing the color cast Mura based on a De-Mura technology and comprises the steps of respectively carrying out R, G, B channel luminous brightness data acquisition on a central area and other areas of the display screen, calculating corresponding color coordinates according to a three-primary-color principle, calculating a color coordinate loss value, setting constraint conditions, calculating the color cast through brightness change and Gamma mapping, carrying out R, G, B brightness adjustment required by color cast Mura compensation, and setting brightness and chromaticity constraint conditions to be the problem of minimum optimization.
Description
Technical Field
The invention belongs to the field of display screen detection and image processing, particularly relates to the field of display screen image detection and display effect optimization, and more particularly relates to a method and a device for repairing color cast Mura of a display screen.
Background
With the continuous development of display screen industry, the continuous update of display technology and display screen materials, screens such as OLED, mini-LED and uuled have been the mainstream display screens and are widely applied to various electronic devices, and such active light-emitting display screens have higher contrast, lighter and thinner size, and have many advantages such as being able to be bent and folded compared with LCD display screens. However, the uniformity of the brightness and the image sticking phenomenon of the active light-emitting display screen can cause low screen yield and high cost, and the compensation technology, namely the current De-Mura technology, is required to be used for solving the two problems except for continuously improving the process. The traditional De-Mura technology can solve the problem of uneven brightness in a certain range, but is limited to the reason of a compensation mechanism, and can not effectively solve Mura such as uneven chroma.
The color shift Mura is represented in brightness in such a way that the light intensity ratio of the RGB three primary colors in the color shift region is inconsistent with the ratio required by white light, and for the spectral color of equal-energy white light, the white light is normal white when the unit energies of the RGB three primary colors are equal. The existing De-Mura method generally approaches acquired screen brightness data to a target value by taking the brightness of a central area of a screen as the target value, only the consistency on the brightness is considered, but the influence of RGB (red, green and blue) three-primary-color brightness matching on the chromaticity is not considered, so that the traditional De-Mura method cannot effectively improve color cast Mura. For the screen with color cast Mura, the existing solution is to use a color Camera to respectively shoot white pictures for repairing, however, the method cannot avoid the problem of crosstalk of the screen body and the problem of inconsistency between Camera-RGB of the Camera and screen gray scale display. The other method is to adopt larger smoothing to the original brightness data of the data to eliminate the color cast, but the method is only suitable for being effective when the brightness of the screen body is more uniform, and once the screen body has other Mura, the De-Mura effect is deteriorated by the method.
Disclosure of Invention
Aiming at the problems, the invention provides a method and a device for restoring color cast Mura of a display screen, which are used for modifying original brightness data under the existing De-Mura method, wherein the modification principle is based on the relation between brightness and chroma.
The method for repairing color cast Mura of the display screen, provided by the invention, comprises the following specific steps:
s1, acquiring a target image of a target object by using a black and white camera;
s2, obtaining image edge contour information of the target image by using a convex hull detection algorithm, and performing sub-pixel positioning according to the image edge contour information;
s3, according to the electric charge obtained by the target image pixel pointCollecting brightness data R of three color channels R/G/B in the central region of the target image0、G0、B0The brightness data R0、G0、B0Transforming to a three-dimensional coordinate system XYZ system to obtain the color coordinate x of the central region0，y0，z0Acquiring brightness data R, G, B of three color channels R/G/B outside a central region of the target image, transforming the brightness data R, G, B into an XYZ system to obtain color coordinates x, y, z of the color cast region, and obtaining the color coordinates x, y, z of the color cast region according to the color coordinates x, y, z of the color cast region and the color coordinates x of the central region0，y0，z0Determining a color coordinate loss value ChromLoss of a color cast region;
s4, obtaining adjusted color cast region brightness data R ', G' and B 'according to the constraint condition of color cast judgment and the color cast region color coordinate loss value ChromLoss, determining the color cast region brightness data loss value LumLoss according to the color cast region brightness data R', G 'and B', and increasing the loss threshold limiting condition to ensure the color cast region brightness data loss value LumLoss is minimum;
and S5, calculating a Mura compensation value according to the Gamma mapping and the brightness data after the color cast region adjustment, and then repairing the color cast Mura.
The further technical scheme of the invention is as follows: acquiring the brightness data R in the central area of the screen0、G0、B0And the color coordinate x0，y0，z0As target values for luminance compensation and chrominance compensation.
The further technical scheme of the invention is as follows: when the color coordinate loss value chromaloss of the color cast region is determined in step S3, the chromaloss is defined as: ChromLoss ═ x-x0)2+(y-y0)2+(z-z0)2In step S4, the constraint conditions for color shift determination are: i x-x0|>δx，|y-y0|>δy，|z-z0|>δ z, wherein δ x, δ y, δ z are respectively threshold values for determining the existence of R/G/B three color cast Mura by human eyes.
The further technical scheme of the invention is as follows: step (ii) ofWhen determining the loss value LumLoss of the luminance data of the color cast region in S4, defining LumLoss as: LumLoss ═ R-R')2+(G-G')2+(B-B')2The loss threshold limiting condition is as follows: | R-R'. circuitry<δR，|G-G'|<δG,|B-B'|<δ B, wherein δ R, δ G and δ B are R/G/B three corresponding color allowable loss threshold values respectively.
The further technical scheme of the invention is as follows: the step S4 of adding the constraint condition to ensure that the luminance data loss value LumLoss is minimum specifically includes: the adjusted brightness data of the color cast region are R ', G ' and B ', and the loss value LumLoss of the brightness data of the color cast region is defined as: LumLoss ═ R-R')2+(G-G')2+(B-B')2The limiting conditions are as follows: | R-R'. circuitry<δR，|G-G'|<δG,|B-B'|<δ B, wherein δ R, δ G, δ B are R/G/B three corresponding color allowable loss threshold values.
The further technical scheme of the invention is as follows: the color cast Mura repairing method is designed into a minimization optimization problem model, and a Loss ═ ChromLoss @ p1+ LumLoss @ p2 is defined, wherein p1 is a color cast region color coordinate Loss value ChromLoss weight coefficient, p2 is a color cast region brightness data Loss value LumLoss weight coefficient, the Loss value is minimized as a target, and constraint conditions are the constraint conditions of color cast judgment and the constraint conditions of Loss threshold value.
The invention also provides a device for realizing the color cast Mura repairing method of the display screen, and the device comprises the following steps: the system comprises a target image acquisition module, a target image processing module, a target image data acquisition module, a target image adjustment module and a target image color cast restoration module, wherein the target image acquisition module acquires a target image of a target object by using a black-and-white camera; the target image processing module acquires image edge contour information of the target image by using a convex hull detection algorithm, and performs sub-pixel positioning according to the image edge contour information; the target image data acquisition module acquires brightness data according to the charges acquired by the target image pixel points and acquires brightness data R of three color channels R/G/B in the central region of the target image0、G0、B0The brightness data R0、G0、B0Conversion to threeAn XYZ system of dimension coordinate system for obtaining color coordinate x of the central region0，y0，z0Acquiring brightness data R, G, B of three color channels R/G/B outside a central region of the target image, transforming the brightness data R, G, B into an XYZ system to obtain color coordinates x, y, z of the color cast region, and obtaining the color coordinates x, y, z of the color cast region according to the color coordinates x, y, z of the color cast region and the color coordinates x of the central region0，y0，z0Determining a color coordinate loss value ChromLoss of a color cast region; the target image adjusting module obtains adjusted color cast region brightness data R ', G' and B 'according to a constraint condition of color cast judgment and the color cast region color coordinate loss value ChromLoss, determines a color cast region brightness data loss value LumLoss according to the color cast region brightness data R', G 'and B', and increases a loss threshold limiting condition to ensure that the color cast region brightness data loss value LumLoss is minimum; and the target image color cast repairing module is used for repairing color cast Mura after calculating a Mura compensation value according to Gamma mapping and brightness data after color cast region adjustment.
The further technical scheme of the invention is that the brightness data R acquired from the central area of the screen0、G0、B0And the color coordinate x0，y0，z0As target values for luminance compensation and chrominance compensation.
The further technical scheme of the invention is that the color coordinate loss value ChromLoss of the color cast region is defined as: ChromLoss ═ x-x0)2+(y-y0)2+(z-z0)2The constraint conditions for color cast determination are as follows: i x-x0|>δx，|y-y0|>δy，|z-z0|>δ z, wherein δ x, δ y, δ z are respectively threshold values for determining the existence of R/G/B three color cast Mura by human eyes.
The further technical solution of the present invention is that, the increasing of the loss threshold limiting condition to ensure the minimum loss value LumLoss of the luminance data specifically includes: the loss value of luminance data in the color cast region, LumLoss, is defined as: LumLoss ═ R-R')2+(G-G')2+(B-B')2The loss threshold limiting condition is as follows: | R-R'. circuitry<δR，|G-G'|<δG,|B-B'|<δ B, wherein δ R, δ G and δ B are R/G/B three corresponding color allowable loss threshold values respectively.
The further technical scheme of the invention is that the color cast Mura repairing method is designed into a minimization optimization problem model, and Loss ═ ChromLoss @ p1+ LumLoss @ p2 is defined, wherein p1 is a color cast region color coordinate Loss value ChromLoss weight coefficient, p2 is a color cast region brightness data Loss value LumLoss weight coefficient, the Loss value is minimized as a target, and the constraint conditions are the constraint conditions of color cast judgment and the constraint threshold limit conditions.
The method and the device for repairing color cast Mura of the display screen have the advantages that: the method solves the adverse effect of overlarge brightness change caused by color cast Mura restoration in the prior art, optimizes the additional adverse effect of uneven brightness when color cast Mura is restored, has simple and stable structure, improves the efficiency of color cast Mura restoration, and adds the color coordinate and the brightness loss value to restrict the distortion of the compensation value.
Drawings
The following further describes embodiments of the present invention with reference to the accompanying drawings:
FIG. 1 is a schematic flow chart of an embodiment of a color cast Mura repairing method according to the present invention;
FIG. 2 is a flow chart illustrating the process of optimizing luminance data according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an original image and corresponding local luminance data values in a central area according to an embodiment of the present disclosure;
FIG. 4 is a diagram illustrating an original image of a color cast region and corresponding local luminance data values according to an embodiment of the present disclosure;
FIG. 5 is a diagram illustrating an original image and corresponding local luminance data values of a central area after De-Mura according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating an original image of a De-Mura post-primary color partial area and corresponding local luminance data values according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a module according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical scheme of the present invention in detail, the present embodiment is implemented on the premise of the technical scheme of the present invention, and detailed implementation modes and specific steps are given.
The following is an explanation of the terminology designed for this invention:
fig. 1 is a schematic flow chart of an embodiment of a color cast Mura repairing method of the present invention, and the specific implementation steps are as follows:
the first step is to acquire a target image by using a black and white camera: and (3) acquiring R, G, B three-primary-color gray scale pictures needing to be repaired by using a black-and-white camera to obtain a target image.
Secondly, performing sub-pixel positioning on the target image according to the edge contour information: acquiring image edge pixel coordinates through a local maximum value, acquiring outline pixel coordinates by utilizing convex hull detection, confirming a four-side outline point set through a Hough transform detection straight line algorithm, and further solving corresponding vertexes and side lengths through four equations established by the four-side outline; gridding the area in the boundary according to the display resolution, establishing a grid index information table, and searching a four-side contour point set in the neighborhood of grid index points for sorting; and establishing an n-order quadratic polynomial model by using the sorted point set indexes and coordinates to realize the coordinate calculation of all the pixel points.
Thirdly, collecting brightness data according to the charges acquired by the pixel points, and collecting the brightness data R of the R/G/B three color channels in the central area of the target image0、G0、B0The brightness data R0、G0、B0Transforming to a three-dimensional coordinate system XYZ system, and acquiring the color coordinate of the central point as x0，y0，z0Acquiring brightness data R, G, B of three color channels R/G/B outside a central region of the target image, transforming the brightness data R, G, B into an XYZ system to obtain color coordinates x, y, z of the color cast region, and obtaining the color coordinates x, y, z of the color cast region according to the color coordinates x, y, z of the color cast region and the color coordinates x of the central region0，y0，z0And determining a color coordinate loss value ChrommLoss of the color cast region.
Because the Gamma calibration of the screen is based on the central area, the brightness data R acquired from the central area of the screen is used as the reference0、G0、B0And color coordinate x0，y0，z0As the target values of the luminance compensation and the chrominance compensation, in the embodiment, the central area is taken as the calibration standard of the color shift Mura, and the luminance data of the central area is taken as R0、G0、B0As shown in fig. 3, in this example,
since the color coordinate in the RGB system has negative value which is not beneficial to calculation and the expression mode of the color coordinate is not easy to understand, the brightness data R0、G0、B0The transformation is performed in the XYZ standard system:
(1) wherein R, G, B corresponds to the central region luminance data R0、G0、B0Further, the color coordinate x of the center region in the XYZ system0，y0，z0Can be obtained from the following formula (1) and the following definition (2):
(1) the color coordinate value x of the central region can be obtained by combining the formula (2) and the formula0、y0、z0。
And fourthly, obtaining adjusted brightness data R ', G' and B 'of the color cast region according to the constraint condition of color cast judgment and the color coordinate loss value ChromLoss of the color cast region, determining the brightness data loss value LumLoss of the color cast region according to the brightness data R', G 'and B' of the color cast region, and increasing the limit condition of a loss threshold to ensure that the brightness data loss value LumLoss of the color cast region is minimum.
The acquired brightness data of the color cast region is R, G, B, and as shown in fig. 4, the color coordinate values of the color cast region are x, y, z, δ x, δ y, and δ z, which are thresholds for determining color cast Mura by human eyes, and the constraint condition | x-x of color cast determination0|>δx,|y-y0|>δy,|z-z0|>The δ z relationship holds, defining the color coordinate loss value as:
ChromLoss＝(x-x0)2+(y-y0)2+(z-z0)2 (3)
and (3) adjusting to obtain color coordinates corresponding to the critical value of the color cast threshold, converting the color coordinates into an RGB system through an XYZ system, and converting the color coordinates into brightness data through the combination of the above formulas (1) and (2) to obtain adjusted brightness data R ', G ' and B ' of the color cast region. Considering that R ', G ', and B ' are a range value, and a step-dropping phenomenon between regions can occur after brightness is adjusted, to solve the step-dropping phenomenon, δ R, δ G, and δ B are defined as three corresponding color allowable loss thresholds of R/G/B, and then a brightness data loss value LumLoss of a color cast region is:
LumLoss＝(R-R')2+(G-G')2+(B-B')2 (4)
the limiting conditions are | R-R ' | < delta R, | G-G ' | < delta G, | B-B ' | < delta B. The specific implementation method of the optimization is shown in fig. 2, and the specific implementation method of the optimization is as follows: and (3) meeting the conditional color coordinate loss value ChrommLoss according to the brightness data of the color cast region, finely adjusting the changed brightness data in order to meet the conditional brightness data loss value LumLoss after the brightness data is changed, and adjusting the brightness data of the color cast region to simultaneously meet two conditions in the continuous fine adjustment iteration process.
And fifthly, calculating a Mura compensation value according to the Gamma mapping and the brightness data after the color cast region adjustment, and then repairing the color cast Mura. Designing the color cast Mura repairing method into a minimized optimization problem model, and defining:
Loss＝ChromLoss*p1+LumLoss*p2 (5)
p1 is color cast region color coordinate Loss value ChromLoss weight coefficient, p2 is color cast region brightness data Loss value LumLoss weight coefficient, the minimization of Loss value is taken as a target, the constraint condition is the constraint condition of color cast judgment and the Loss threshold limiting condition, the selectable range of p1 and p2 is [0,1], when the above formula meets the constraint condition and the limiting condition in the fourth step and is the minimum value, the color cast Mura problem can be solved by the modified brightness data at the moment, the current brightness data is a relative value and can not be directly expressed as a picture to be displayed in a screen for observation, and the conversion is needed according to the relation between the brightness data and the gray scale, namely, the Gamma mapping is used for converting the brightness data into the gray scale value. The specific formula is as follows:
wherein Gray is a Gray-scale value, R' is luminance data satisfying the condition after modification, gamma is a standard value of the current screen, the Gray-scale value obtained by the above formula is the final compensation data Mura compensation value, the effect diagram after repair is as shown in fig. 5 and 6, the total display effect areas of different repaired areas are consistent, and no obvious luminance and color deviation is seen.
As shown in fig. 7, the apparatus for implementing this embodiment specifically includes a target image obtaining module 1, a target image processing module 2, a target image data collecting module 3, a target image adjusting module 4, and a target image color shift repairing module 5, where the target image obtaining module 1 obtains a target image through a black-and-white camera; the target image processing module 2 carries out sub-pixel positioning on the target image according to the edge contour information; the target image data acquisition module 3 acquires and acquires brightness data according to the charges acquired by the pixel pointsBrightness data R of three color channels R/G/B in the central region of the target image0、G0、B0The brightness data R0、G0、B0Transforming to a three-dimensional coordinate system XYZ system, and acquiring the color coordinate of the central point as x0，y0，z0Acquiring brightness data R, G, B of three color channels R/G/B outside a central region of the target image, transforming the brightness data R, G, B into an XYZ system to obtain color coordinates x, y, z of the color cast region, and obtaining the color coordinates x, y, z of the color cast region according to the color coordinates x, y, z of the color cast region and the color coordinates x of the central region0，y0，z0Determining a color coordinate loss value ChromLoss of a color cast region; the target image adjusting module 4 obtains adjusted color cast region brightness data R ', G', B 'according to the constraint condition of color cast determination and the color cast region color coordinate loss value chromeloss, determines the color cast region brightness data loss value LumLoss according to the color cast region brightness data R', G ', B', and increases the loss threshold limiting condition to ensure the color cast region brightness data loss value LumLoss is minimum; and the target image color cast repairing module 5 is used for repairing color cast Mura after calculating a Mura compensation value according to Gamma mapping and brightness data after color cast region adjustment.
The preferred embodiments of the present invention are: acquiring the brightness data R in the central area of the screen0、G0、B0And the color coordinate x0，y0，z0As target values for luminance compensation and chrominance compensation.
The preferred embodiments of the present invention are: the color cast region color coordinate loss value ChromLoss is defined as: ChromLoss ═ x-x0)2+(y-y0)2+(z-z0)2The constraint conditions for color cast determination are as follows: i x-x0|>δx，|y-y0|>δy，|z-z0|>δ z, wherein δ x, δ y, δ z are respectively threshold values for determining the existence of R/G/B three color cast Mura by human eyes.
The preferred embodiments of the present invention are: the increasing the loss threshold limiting condition to ensure that the luminance data loss value LumLoss is minimum specifically includes: color(s)The partial area luminance data loss value LumLoss is defined as: LumLoss ═ R-R')2+(G-G')2+(B-B')2The loss threshold limiting condition is as follows: | R-R'. circuitry<δR，|G-G'|<δG,|B-B'|<δ B, wherein δ R, δ G and δ B are R/G/B three corresponding color allowable loss threshold values respectively.
The preferred embodiments of the present invention are: the color cast Mura repairing method is designed into a minimization optimization problem model, and a Loss ═ ChromLoss @ p1+ LumLoss @ p2 is defined, wherein p1 is a color cast region color coordinate Loss value ChromLoss weight coefficient, p2 is a color cast region brightness data Loss value LumLoss weight coefficient, the Loss value is minimized as a target, and constraint conditions are the constraint conditions of color cast judgment and the constraint conditions of Loss threshold value.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a step, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such step, method, or apparatus.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A method for repairing color cast Mura of a display screen is characterized by comprising the following steps:
s1, acquiring a target image of a target object by using a black and white camera;
s2, obtaining image edge contour information of the target image by using a convex hull detection algorithm, and performing sub-pixel positioning according to the image edge contour information;
s3, collecting brightness data according to the charges obtained by the target image pixel points, and collecting three R/G/B types in the central area of the target imageLuminance data R of color channel0、G0、B0The brightness data R0、G0、B0Transforming to a three-dimensional coordinate system XYZ system to obtain the color coordinate x of the central region0，y0，z0Acquiring brightness data R, G, B of three color channels R/G/B outside a central region of the target image, transforming the brightness data R, G, B into an XYZ system to obtain color coordinates x, y, z of the color cast region, and obtaining the color coordinates x, y, z of the color cast region according to the color coordinates x, y, z of the color cast region and the color coordinates x of the central region0，y0，z0Determining a color coordinate loss value ChromLoss of a color cast region;
s4, obtaining adjusted color cast region brightness data R ', G', B 'according to the constraint condition of color cast judgment and the color cast region color coordinate loss value ChromLoss, determining the color cast region brightness data loss value LumLoss according to the color cast region brightness data R', G ', B', and increasing the loss threshold limiting condition to ensure the color cast region brightness data loss value LumLoss is minimum, wherein the color cast region color coordinate loss value ChromLoss is determined as follows: ChromLoss ═ x-x0)2+(y-y0)2+(z-z0)2The constraint conditions for color cast determination are as follows: i x-x0|>δx，|y-y0|>δy，|z-z0|>δ z, wherein δ x, δ y and δ z are thresholds for determining the existence of R/G/B three color cast Mura by human eyes respectively;
and S5, calculating a Mura compensation value according to the Gamma mapping and the brightness data after the color cast region adjustment, and then repairing the color cast Mura.
2. The method for repairing color cast Mura of display screen according to claim 1, wherein the brightness data R obtained from the central area of the screen0、G0、B0And the color coordinate x0，y0，z0As target values for luminance compensation and chrominance compensation.
3. The method of claim 1 for repairing color cast Mura of display screen,when the color cast region luminance data loss value LumLoss is determined in step S4, LumLoss is defined as: LumLoss ═ R-R')2+(G-G')2+(B-B')2The loss threshold limiting condition is as follows: | R-R'. circuitry<δR，|G-G'|<δG,|B-B'|<δ B, wherein δ R, δ G and δ B are R/G/B three corresponding color allowable loss threshold values respectively.
4. The method of claim 3, wherein the method is designed as a minimization optimization problem model, defining Loss ═ ChromLoss × p1+ LumLoss × p2, wherein p1 is a Loss value ChromLoss weight coefficient of color coordinates in the color shift region, p2 is a Loss value LumLoss weight coefficient of luminance data in the color shift region, and the Loss value is minimized as a target, and the constraint conditions are the constraint conditions for determining the color shift and the constraint conditions for the Loss threshold.
5. A display screen color cast Mura restoration apparatus, the apparatus comprising:
the target image acquisition module acquires a target image of a target object by using a black and white camera;
the target image processing module is used for acquiring image edge contour information of the target image by using a convex hull detection algorithm and performing sub-pixel positioning according to the image edge contour information;
the target image data acquisition module is used for acquiring brightness data according to the charges acquired by the target image pixel points and acquiring brightness data R of three color channels R/G/B in the central region of the target image0、G0、B0The brightness data R0、G0、B0Transforming to a three-dimensional coordinate system XYZ system to obtain the color coordinate x of the central region0，y0，z0Acquiring brightness data R, G, B of three color channels R/G/B outside the central region of the target image, transforming the brightness data R, G, B into XYZ system to obtain color coordinates x, y, z of the color cast region, and obtaining the color coordinates x, y, z of the color cast region and the central region according to the color coordinates x, y, z of the color cast regionColor coordinate x of the field0，y0，z0Determining a color coordinate loss value ChromLoss of a color cast region;
the target image adjusting module obtains adjusted color cast region brightness data R ', G' and B 'according to a constraint condition of color cast judgment and the color cast region color coordinate loss value ChromLoss, determines a color cast region brightness data loss value LumLoss according to the color cast region brightness data R', G 'and B', and increases a loss threshold limiting condition to ensure that the color cast region brightness data loss value LumLoss is minimum, wherein the color cast region color coordinate loss value ChromLoss is defined as: ChromLoss ═ x-x0)2+(y-y0)2+(z-z0)2The constraint conditions for color cast determination are as follows: i x-x0|>δx，|y-y0|>δy，|z-z0|>δ z, wherein δ x, δ y and δ z are thresholds for determining the existence of R/G/B three color cast Mura by human eyes respectively;
and the target image color cast repairing module is used for repairing color cast Mura after calculating a Mura compensation value according to the Gamma mapping and the brightness data after the color cast region adjustment.
6. The device as claimed in claim 5, wherein the brightness data R obtained from the central area of the screen is used to repair color cast Mura0、G0、B0And the color coordinate x0，y0，z0As target values for luminance compensation and chrominance compensation.
7. The apparatus for restoring color cast Mura of a display screen according to claim 5, wherein said increasing the loss threshold constraint to ensure the minimum loss value LumLoss of luminance data comprises: the loss value of luminance data in the color cast region, LumLoss, is defined as: LumLoss ═ R-R')2+(G-G')2+(B-B')2The loss threshold limiting condition is as follows: | R-R'. circuitry<δR，|G-G'|<δG,|B-B'|<δ B, wherein δ R, δ G and δ B are R/G/B three corresponding color allowable loss threshold values respectively.
8. The apparatus of claim 7, wherein the color cast Mura repairing method is designed as a minimization optimization problem model, defining Loss as chromaloss p1+ LumLoss p2, where p1 is a chromacoordinate Loss value chromaloss weight coefficient of the color cast region, p2 is a chromadata Loss value LumLoss weight coefficient of the color cast region, and the Loss value is minimized as a target, and the constraint conditions are the constraint conditions for determining the color cast and the constraint conditions for limiting the Loss threshold.
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