CN113284456A - Method and device for determining correction coefficient of display screen lamp point and computer equipment - Google Patents

Method and device for determining correction coefficient of display screen lamp point and computer equipment Download PDF

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CN113284456A
CN113284456A CN202110827101.6A CN202110827101A CN113284456A CN 113284456 A CN113284456 A CN 113284456A CN 202110827101 A CN202110827101 A CN 202110827101A CN 113284456 A CN113284456 A CN 113284456A
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gray scale
correction coefficient
value
color parameter
lamp point
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CN113284456B (en
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何志民
王利文
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Colorlight Cloud Technology Co Ltd
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Colorlight Cloud Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature

Abstract

The application relates to a method and a device for determining a correction coefficient of a display screen lamp point and computer equipment. The method comprises the following steps: acquiring an original image of a display screen to be corrected; aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales respectively; and acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale. By adopting the method, the correction coefficient of the lamp point and the color parameter value of the lamp point form a more accurate linear corresponding relation, thereby improving the correction effect of correcting the display screen by adopting the correction coefficient.

Description

Method and device for determining correction coefficient of display screen lamp point and computer equipment
Technical Field
The present application relates to the field of LED display screen correction technologies, and in particular, to a method and an apparatus for determining a correction coefficient of a display screen light point, a computer device, and a storage medium.
Background
When an industrial camera is used for correcting an LED display screen in the prior art, the brightness or stimulus value of a lamp point is collected at a single gray scale, so that the brightness or stimulus value of the lamp point and a correction coefficient are determined to be in a completely linear relationship, and the correction coefficient of the brightness or stimulus value of the lamp point is further determined.
However, in practice, due to the differences of the screen hardware itself and the differences of the acquisition devices and the acquisition methods, the variation of the lamp stimulation value or brightness with the correction coefficient may not be completely linear (for example, the actual brightness of the lamp is 100 when the correction coefficient is 1, and if the brightness of the lamp is adjusted from 100 to 80, the correction coefficient used is 0.8, and the actual brightness of the lamp does not become the expected brightness 80). Therefore, the correction effect of correcting the LED display screen by using the correction coefficient determined by the existing method is often poorer than the ideal correction effect.
Disclosure of Invention
In view of the above, it is necessary to provide a method, an apparatus, a computer device and a storage medium for determining a correction coefficient of a display lamp point, in order to solve the technical problem that the correction effect of correcting an LED display screen by using the correction coefficient determined by the conventional method is often worse than the ideal correction effect.
A method for determining a correction coefficient of a display screen lamp point comprises the following steps:
acquiring an original image of a display screen to be corrected;
aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales respectively;
and acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
In one embodiment, if the color parameter value is a luminance value, the obtaining a correction coefficient of the light point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale includes:
acquiring gamma values of the plurality of gray scales; the plurality of gray scales comprise a first gray scale, a second gray scale and a third gray scale;
obtaining a first brightness correction coefficient and a second brightness correction coefficient according to the gamma value of each gray scale;
and obtaining the brightness correction coefficient of the lamp point according to a target brightness value, the first brightness correction coefficient, the second brightness correction coefficient and the brightness value under each gray scale.
In one embodiment, the obtaining the first brightness correction coefficient and the second brightness correction coefficient according to the gamma value of each gray scale includes:
acquiring the ratio of the gamma value of the first gray scale to the gamma value of the third gray scale as a first brightness correction coefficient;
and acquiring the ratio of the gamma value of the second gray scale to the gamma value of the third gray scale as a second brightness correction coefficient.
In one embodiment, the brightness correction factor of the lamp point is obtained by the following relation:
Figure 601834DEST_PATH_IMAGE001
wherein the content of the first and second substances,p brightness of lightA brightness correction coefficient representing the lamp point,d 1which represents a first luminance correction coefficient, is,d 2which represents the second luminance correction coefficient, is,Lwhich represents the brightness value of the object,L 1indicating a first brightness value of the lamp point at a first gray level,L 2representing a second luminance value of the lamp point at a second gray scale.
In one embodiment, if the color parameter value is a tristimulus value, the obtaining a correction coefficient of the light point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale includes:
acquiring gamma values of the plurality of gray scales; the plurality of gray scales comprise a low gray scale, a first gray scale, a second gray scale and a third gray scale;
gamma value gamma according to the low gray scale0Gamma value gamma of the first gray scale1Gamma value gamma of the second gray scale2And gamma value gamma of the third gray scale to obtain a low gray scale chromaticity correction coefficientp 0=γ0Gamma, first chroma correction factorp 1=γ1Gamma, and second chroma correction factorp 2=γ2/γ；
According to the targetTristimulus values: rd, Gd, Bd, the low gray scale chromaticity correction coefficientp 0The first chroma correction coefficientp 1The second chroma correction factorp 2The tristimulus value at low gray scale: r0、G0、B0And the tristimulus value under the first gray scale: r1、G1、B1And a tristimulus value at the second gray scale: r2、G2、B2Obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points respectively;
wherein the tristimulus values at low grey scale are:
Figure 191078DEST_PATH_IMAGE002
，
the tristimulus values at the first gray level are:
Figure 377340DEST_PATH_IMAGE003
，
the tristimulus values at the second grey scale are:
Figure 569287DEST_PATH_IMAGE004
，
the target tristimulus values are:
Figure 790183DEST_PATH_IMAGE005
。
in one embodiment, the method further comprises, according to the target tristimulus value: rd, Gd, Bd, the low gray scale chromaticity correction coefficientp 0The first chroma correction coefficientp 1The second chroma correction factorp 2The tristimulus value at low gray scale: r0、G0、B0And the tristimulus value under the first gray scale: r1、G1、B1And a tristimulus value at the second gray scale: r2、G2、B2Obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points respectively, comprising:
obtaining a relational expression for achieving the target color gamut:
Figure 783285DEST_PATH_IMAGE006
，
Figure 581477DEST_PATH_IMAGE007
and
Figure 452481DEST_PATH_IMAGE008
；
obtaining coefficients according to the three relational expressions for achieving the target color gamut
Figure 652518DEST_PATH_IMAGE009
、
Figure 317986DEST_PATH_IMAGE010
And
Figure 478840DEST_PATH_IMAGE011
respectively as follows:
Figure 481431DEST_PATH_IMAGE012
，
Figure 535974DEST_PATH_IMAGE013
and
Figure 139387DEST_PATH_IMAGE014
；
using tristimulus values of the first gray scaleR 1、G 1、B 1Tristimulus values instead of the low gray levelsR 0、G 0、B 0To obtain substituted coefficients
Figure 787538DEST_PATH_IMAGE009
、
Figure 328240DEST_PATH_IMAGE010
And
Figure 502870DEST_PATH_IMAGE011
respectively as follows:
Figure 244561DEST_PATH_IMAGE015
according to substituted coefficients
Figure 504641DEST_PATH_IMAGE009
、
Figure 989980DEST_PATH_IMAGE010
And
Figure 19116DEST_PATH_IMAGE011
the chromaticity correction coefficients corresponding to the tristimulus values of the lamp point are respectively obtained by the following relational expression:
Figure 695823DEST_PATH_IMAGE016
。
in one embodiment, after obtaining the correction coefficient of the light point in the display screen to be corrected according to the target color parameter value and the color parameter value at each gray scale, the method further includes:
acquiring an original color parameter value of the lamp point;
and correcting the original color parameter value based on the correction coefficient to obtain the corrected color parameter value of the lamp point.
A correction coefficient determining apparatus for a display screen light point, the apparatus comprising:
the image acquisition module is used for acquiring an original image of the display screen to be corrected;
the data acquisition module is used for acquiring color parameter values of any lamp point in the original image under a plurality of preset gray scales;
and the coefficient determining module is used for acquiring a target color parameter value of the lamp point and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring an original image of a display screen to be corrected;
aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales respectively;
and acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring an original image of a display screen to be corrected;
aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales respectively;
and acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
After the original image of the display screen to be corrected is obtained, the color parameter values of the lamp point under the preset multiple gray scales are collected for any lamp point in the original image, so that after the target color parameter value of the lamp point is obtained, the correction coefficient of the lamp point in the display screen can be obtained according to the target color parameter value and the color parameter value under each gray scale. The method determines the correction coefficient of the lamp point through the color parameter values of the lamp point under a plurality of gray scales, wherein, the correction involves two times of correction, namely brightness correction and chroma correction, so that the correction coefficient of the lamp point and the color parameter value of the lamp point can form more accurate linear corresponding relation, thereby improving the correction effect of correcting the display screen by adopting the correction coefficient.
Drawings
FIG. 1 is a diagram illustrating an exemplary embodiment of a method for determining correction coefficients for display lamp spots;
FIG. 2 is a flowchart illustrating the step of determining the luminance correction factor of the lamp point according to an embodiment;
FIG. 3 is a diagram illustrating the relationship between chrominance and gray scale values in one embodiment;
FIG. 4 is a flowchart illustrating a method for determining correction coefficients for display screen lighting points according to another embodiment;
FIG. 5 is a block diagram showing the structure of a correction coefficient determining apparatus for a display panel lighting point according to an embodiment;
FIG. 6 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that the term "first \ second" referred to in the embodiments of the present invention is only used for distinguishing similar objects, and does not represent a specific ordering for the objects, and it should be understood that "first \ second" may exchange a specific order or sequence order if allowed. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that embodiments of the invention described herein may be practiced in sequences other than those illustrated or described herein.
In an embodiment, as shown in fig. 1, a method for determining a correction coefficient of a display lamp point is provided, and this embodiment is illustrated by applying the method to a terminal, it is to be understood that the method may also be applied to a server, and may also be applied to a system including the terminal and the server, and is implemented by interaction between the terminal and the server. In this embodiment, the method includes the steps of:
and step S102, acquiring an original image of the display screen to be corrected.
In the specific implementation, the display screen to be corrected can be an LED display screen, an original image of the display screen to be corrected can be obtained by image acquisition of the display screen to be corrected through image acquisition equipment, the acquired original image can be transmitted to the terminal after the original image is obtained, the terminal calculates a correction coefficient based on the original image and sends the correction coefficient to the receiving card, the display screen to be corrected is corrected through the receiving card, and the receiving card is arranged in the display screen to be corrected.
Step S104, aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales.
Wherein, the gray level represents the gradation level with different brightness between the brightest and the darkest, the maximum level of the gray level can be determined by the color bit number, for example, when the color bit number is 8bit, it is equivalent to 28=256 levels of gray scale, the maximum gray scale is 255; when the color bit number is 10 bits, it is equivalent to 210=1024 gradations, and the maximum gradation is 1023.
Wherein the color parameter values comprise luminance values and tristimulus values, wherein the tristimulus values are representative of the amount of stimulus levels of three primary colors, namely red, green and blue, that cause the human retina to perceive a certain color.
The preset plurality of gray scales include at least three gray scales, such as a first gray scale, a second gray scale and a third gray scale, wherein the third gray scale can be the highest gray scale of all levels of gray scales corresponding to the current color bit number. It is understood that the greater the number of preset gradations, the higher the accuracy of the determined correction coefficient.
The gray levels for determining the luminance correction coefficients and the gray levels for determining the chrominance correction coefficients corresponding to the tristimulus values may be different.
In a specific implementation, the preset plurality of gray scales may include at least three gray scales, each of which is different from the other, and the embodiment takes the three gray scales as a first gray scale, a second gray scale and a third gray scale, respectively, as an example, to describe the scheme of the embodiment. Specifically, for any one lamp point in the original image, color parameter values of the lamp point under a plurality of preset gray scales are collected, that is, brightness values of the lamp point under a first preset gray scale, a second preset gray scale and a third preset gray scale are collected, tristimulus values of the lamp point under the first preset gray scale, the second preset gray scale and the third preset gray scale are collected, a brightness correction coefficient of the lamp point can be calculated according to the brightness values of the lamp point under the first preset gray scale, the second preset gray scale and the third preset gray scale, and chromaticity correction coefficients corresponding to the tristimulus values of the lamp point are calculated according to the tristimulus values of the lamp point under the first preset gray scale, the second preset gray scale and the third preset gray scale.
And S106, acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
The target color parameter value can represent a color parameter value to which the lamp point needs to be adjusted, and the target color parameter value comprises a target brightness value and a target tristimulus value.
The correction coefficients of the lamp points comprise brightness correction coefficients and chromaticity correction coefficients corresponding to the tristimulus values respectively. RGB corresponds to a luminance correction coefficient, and RGB corresponds to three chrominance correction coefficients.
It can be understood that due to differences of screen hardware and differences of the acquisition device and the acquisition method, change curves of tristimulus values or brightness changing along with the correction coefficients between different lamp points may be different, and non-linearity degrees between the three stimulus values may also be different, so that when the correction coefficients of the lamp points are obtained, the concept of respectively obtaining the correction coefficients of each lamp point and respectively obtaining the chromaticity correction coefficients corresponding to the brightness correction coefficients and the three stimulus values for each lamp point is adopted to improve the correction effect of the display screen.
In the specific implementation, after the first gray scale, the second gray scale and the third gray scale are determined, the gamma values of the gray scales are respectively obtained, and the first correction coefficient and the second correction coefficient are obtained according to the gamma values of the gray scales. And acquiring the correction coefficient of the lamp point according to the target parameter value, the first correction coefficient, the second correction coefficient and the color parameter value under each gray scale.
More specifically, when the color parameter value is a brightness value, a first brightness correction coefficient and a second brightness correction coefficient are obtained according to the gamma value of each gray scale, and after a target brightness value of the lamp point is obtained, the brightness correction coefficient of the lamp point is obtained according to the target brightness value of the lamp point, the first brightness correction coefficient, the second brightness correction coefficient and the brightness value of the lamp point under each gray scale. And when the color parameter value is a tristimulus value, obtaining a first chromaticity correction coefficient and a second chromaticity correction coefficient according to the gamma value of each gray scale, and after obtaining a target tristimulus value of the lamp point, obtaining chromaticity correction coefficients corresponding to the tristimulus values of the lamp point according to the target tristimulus value of the lamp point, the first chromaticity correction coefficient, the second chromaticity correction coefficient and the tristimulus values of the lamp point under each gray scale.
In the method for determining the correction coefficient of the lamp point of the display screen, after the original image of the display screen to be corrected is obtained, the color parameter values of the lamp point under the preset multiple gray scales are collected aiming at any lamp point in the original image, so that after the target color parameter value of the lamp point is obtained, the correction coefficient of the lamp point in the display screen to be corrected can be obtained according to the target color parameter value and the color parameter values under the various gray scales. The method determines the correction coefficient of the lamp point through the color parameter values of the lamp point under a plurality of gray scales, wherein, the correction involves two times of correction, namely brightness correction and chroma correction, so that the correction coefficient of the lamp point and the color parameter value of the lamp point can form more accurate linear corresponding relation, thereby improving the correction effect of correcting the display screen by adopting the correction coefficient.
In one embodiment, as shown in fig. 2, when the color parameter value is a luminance value, the step S106 includes:
step S202, acquiring gamma values of a plurality of gray scales; the plurality of gray scales may include a first gray scale, a second gray scale, and a third gray scale;
step S204, obtaining a first brightness correction coefficient and a second brightness correction coefficient according to the gamma value of each gray scale;
step S206, obtaining the brightness correction coefficient of the lamp point according to the target brightness value, the first brightness correction coefficient, the second brightness correction coefficient and the brightness value under each gray scale.
Wherein the gamma value may represent a relationship between an input value and a brightness at the output of the display at the time of image processing.
The third gray scale can be the highest gray scale of the gray scales corresponding to the current color bit number. For example, when the color bit number is 8 bits, a total of 256 levels of gray scale (0-255), the highest gray scale is 255; when the color bit number is 10 bits, the total 1024 gray levels (0-1023) are provided, and the highest gray level is 1023.
The first brightness correction coefficient can represent a correction coefficient corresponding to the brightness of the lamp point under the first gray scale.
The second brightness correction coefficient may represent a correction coefficient corresponding to the brightness of the lamp point at the second gray scale.
The target brightness value can be understood as the brightness value to which the lamp point needs to be adjusted.
In a specific implementation, the first brightness correction coefficient may be obtained by calculating a ratio of a gamma value of the first gray scale to a gamma value of the highest gray scale, the second brightness correction coefficient may be obtained by calculating a ratio of a gamma value of the second gray scale to a gamma value of the highest gray scale, and when there are more than three gray scales, the nth brightness correction coefficient may be obtained by calculating a ratio of a gamma value of the nth gray scale to a gamma value of the highest gray scale.
It can be understood that, when the variation of the brightness correction coefficient is relatively small, the variation of the lamp point brightness along with the brightness correction coefficient can be approximately considered to be linear, so if it is assumed that the brightness value corresponding to the first brightness correction coefficient is the first brightness value and the brightness value corresponding to the second brightness correction coefficient is the second brightness value, the following relationship holds:
Figure 177620DEST_PATH_IMAGE017
based on the relational expression, after obtaining the target brightness value, the first brightness correction coefficient, the second brightness correction coefficient, the first brightness value and the second brightness value, substituting the values into the relational expression, and then obtaining the brightness correction coefficient of the lamp point.
In an embodiment, the step S204 specifically includes: acquiring the ratio of the gamma value of the first gray scale to the gamma value of the third gray scale as a first brightness correction coefficient; and acquiring the ratio of the gamma value of the second gray scale to the gamma value of the third gray scale as a second brightness correction coefficient.
In the specific implementation, taking the preset multiple gray scales as the first gray scale, the second gray scale and the highest gray scale as an example, it is noted that the gamma values of the respective gray scales are gamma1、γ2Gamma, the first brightness correction coefficient (denoted as d)1) Can be expressed as: d1=γ1V, second luminance correction factor (denoted as d)2) Can be expressed as: d2=γ2/γ。
For example, the gamma value γ =2915 when the highest gray scale is 255, and the gamma values γ when the first gray scale is 225 and the second gray scale is 246, respectively1=2060 and gamma2=2648, the first brightness correction coefficient d1=γ1/γ =2060/2915=0.707, and the second luminance correction coefficient d2=γ2/γ=2648/2915=0.905。
Further, if the first brightness value under the first gray scale is recorded asL 1Second luminance value at second gray levelL 2And the target brightness value is L, and based on the relation between the brightness value and the correction coefficient, the brightness correction coefficient of the lamp point can be obtainedp Brightness of lightCan be expressed as:
Figure 466650DEST_PATH_IMAGE001
。
in the above embodiment, when the color parameter value is a luminance value and the luminance correction coefficient changes less, it is considered that the luminance changes linearly with the correction coefficient, and thus after the target luminance value, the first luminance correction coefficient, the second luminance correction coefficient, and the luminance value at each gray scale are obtained, the luminance correction coefficient of the lamp point is determined based on the linear relationship between the luminance value and the luminance correction coefficient.
In one embodiment, when the color parameter value is a tristimulus value, the step S106 further includes: obtaining a first chrominance correction coefficient and a second chrominance correction coefficient according to preset gamma values of a plurality of gray scales; the plurality of gray scales comprise a first gray scale, a second gray scale and a third gray scale; and obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points according to the target tristimulus values, the first chromaticity correction coefficient, the second chromaticity correction coefficient and the tristimulus values under each gray scale.
The first chrominance correction coefficient can represent a correction coefficient corresponding to a tristimulus value of the lamp point under the first gray scale.
The second chromaticity correction coefficient may represent a correction coefficient corresponding to a tristimulus value of the lamp point at the second gray scale.
The target tristimulus value can be understood as the tristimulus value to which the lamp point needs to be adjusted.
In a specific implementation, the first chrominance correction coefficient may be obtained by calculating a ratio of a gamma value of the first gray scale to the highest gray scale, the second chrominance correction coefficient may be obtained by calculating a ratio of a gamma value of the second gray scale to the highest gray scale, and when there are more than three gray scales, the nth chrominance correction coefficient may be obtained by calculating a ratio of a gamma value of the nth gray scale to the highest gray scale.
It is understood that, similar to the brightness correction of the lamp point, the relationship between the brightness of the lamp point and the brightness correction coefficient is not completely linear, the relationship between the three stimulus values and the correction coefficient is not completely linear, and the degree of nonlinearity of the three stimulus values may be different. If the tristimulus values of a single lamp point are regarded as a three-dimensional vector, the direction and the magnitude of the three-dimensional vector will change with the correction coefficient. When the correction coefficient varies little, it can be approximated that the tristimulus values each vary linearly with the correction coefficient. Therefore, the correction coefficient of the multi-gray-scale chromaticity correction can be calculated according to the relationship that the chromaticity correction coefficient corresponding to each tristimulus value and the tristimulus value respectively change linearly.
In one embodiment, when the color parameter value is a tristimulus value, the step S106 further includes: acquiring gamma values of a plurality of gray scales; the plurality of gray scales comprise a low gray scale, a first gray scale, a second gray scale and a third gray scale; gamma value gamma according to low gray scale0Gamma value gamma of the first gray scale1Gamma value gamma of the second gray scale2Gamma value gamma of the third gray scale to obtain a low gray scale chromaticity correction coefficientp 0=γ0Gamma, first chroma correction factorp 1=γ1Gamma, and second chroma correction factorp 2=γ2Gamma; according to the target tristimulus value: rd, Gd, Bd, low gray scale chromaticity correction coefficientp 0First chroma correction factorp 1Second chroma correction factorp 2Tristimulus values at low grey scale: r0、G0、B0The tristimulus value under the first gray scale: r1、G1、B1And tristimulus values at the second gray scale: r2、G2、B2And obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points.
The low gray scale chromaticity correction coefficient may represent a correction coefficient corresponding to a tristimulus value of the lamp point at a low gray scale.
In the specific implementation, the process of obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp point is as follows: setting four gray levels as a low gray level, a first gray level, a second gray level and a highest gray level, wherein the first gray level can be 225 gray level, the second gray level can be 246 gray level, and the tristimulus values of the lamp point under each gray level can be respectively expressed as:
the tristimulus values of the lamp points under the low gray scale, namely the tristimulus values of the three primary colors of red, green and blue are respectively as follows:
Figure 350292DEST_PATH_IMAGE018
the tristimulus values of the lamp point under the first gray scale are respectively as follows:
Figure 699365DEST_PATH_IMAGE019
the tristimulus values of the lamp point under the second gray scale are respectively as follows:
Figure 668458DEST_PATH_IMAGE020
the target tristimulus values of the lamp points are respectively:
Figure 495600DEST_PATH_IMAGE005
to achieve the target color gamut, the following equation needs to be established:
Figure 499328DEST_PATH_IMAGE006
wherein the content of the first and second substances,
Figure 774627DEST_PATH_IMAGE021
being the principal component of the target gamut tristimulus value,
Figure 106382DEST_PATH_IMAGE022
and
Figure 861849DEST_PATH_IMAGE023
the reason why the above formula holds for the sub-components of the tristimulus values of the target color gamut is that when the low gray scale is converted into the target gray scale, the conversion of the low gray scale and the target gray scale is not in a linear relationship, so that the expression relationship of the target color gamut of the target gray scale is formed by combining expressions corresponding to the linear relationship of the gray scales, as shown in fig. 3, wherein R is shown in the figure1、R2And RdThe three stimulus values under the first gray scale, the three stimulus values under the second gray scale and the red component value in the target three stimulus values respectively, wherein the numerical value of the second gray scale can be larger than that of the first gray scale, and the numerical value of the target gray scale can be in the range of the first gray scale and the second gray scaleAnd the values of the first gray scale and the second gray scale can be changed, so long as the change of the correction coefficient is small, the tristimulus values can be approximately considered to be linearly changed along with the correction coefficient.
By converting the above formula, the method can be obtained
Figure 329870DEST_PATH_IMAGE024
Further, multiply both ends of the above formula by
Figure 145380DEST_PATH_IMAGE025
The following can be obtained:
Figure 964431DEST_PATH_IMAGE026
due to the fact that
Figure 523588DEST_PATH_IMAGE027
The product of (d) is a unit vector, and thus:
Figure 610231DEST_PATH_IMAGE012
then there is a coefficient
Figure 331062DEST_PATH_IMAGE028
Similarly, to achieve the target color gamut, the following two relationships need to be satisfied:
Figure 637410DEST_PATH_IMAGE007
，
Figure 734679DEST_PATH_IMAGE008
wherein, the formula
Figure 442872DEST_PATH_IMAGE029
In (1),
Figure 334604DEST_PATH_IMAGE030
is a main component, and is characterized in that,
Figure 128248DEST_PATH_IMAGE031
and
Figure 406039DEST_PATH_IMAGE032
is a minor component; a formula
Figure 703159DEST_PATH_IMAGE008
In (1),
Figure 31372DEST_PATH_IMAGE033
is a main component, and is characterized in that,
Figure 46733DEST_PATH_IMAGE034
and
Figure 751384DEST_PATH_IMAGE035
is the minor component.
And the above
Figure 667125DEST_PATH_IMAGE009
The relational expression (c) is obtained in the same way and is based on the formula
Figure 166239DEST_PATH_IMAGE029
And
Figure 668896DEST_PATH_IMAGE036
is obtained by
Figure 911659DEST_PATH_IMAGE010
And
Figure 183371DEST_PATH_IMAGE011
respectively as follows:
Figure 853387DEST_PATH_IMAGE037
，
Figure 843340DEST_PATH_IMAGE038
in practical application, in order to save the time for acquiring the image, the tristimulus values of low gray scale may not be acquiredR 0、G 0、B 0But using the tristimulus value of the first gray levelR 1、G 1、B 1Instead, low gray-scale chrominance correction coefficientsp 0Also by the first chrominance correction factorp 1Instead, there is no significant difference in the actual correction effect, and therefore, it is possible to obtain:
Figure 624214DEST_PATH_IMAGE039
further, the relation of the chromaticity correction coefficients corresponding to the tristimulus values of the lamp point is:
Figure 783056DEST_PATH_IMAGE016
wherein the content of the first and second substances,
Figure 623973DEST_PATH_IMAGE040
、
Figure 101222DEST_PATH_IMAGE041
and
Figure 685787DEST_PATH_IMAGE042
respectively representing the correction coefficients of the three primary colors of red, green and blue in the tristimulus values of the lamp point.
In the process of obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points, based on the condition of meeting the target color gamut, obtaining each stimulus value in the target tristimulus values, and obtaining the relational expressions between the stimulus values and the red stimulus value, the green stimulus value and the blue stimulus value of each gray scale respectively, namely obtaining the three relational expressions which can reach the target tristimulus values, and further converting and obtaining the chromaticity correction coefficients corresponding to the three stimulus values based on the three relational expressions.
It should be noted that, in the present application, the process of obtaining the chromaticity correction coefficients corresponding to the luminance correction coefficient and the tristimulus values of the lamp point in the display screen to be corrected is obtained based on the highlight condition, that is, the chromaticity correction coefficient and the luminance correction coefficient corresponding to the tristimulus values of the lamp point under the highlight multi-gray scale are obtained.
In the present embodiment, when the color parameter values are tristimulus values and the luminance correction coefficients change less, the tristimulus values are considered to change linearly with the respective correction coefficients, and thus, after obtaining the target tristimulus values, the first chrominance correction coefficient, the second chrominance correction coefficient, and the tristimulus values under each gray scale, determining chromaticity correction coefficients corresponding to the tristimulus values of the lamp points based on linear relationship between the tristimulus values and the respective correction coefficients, the method for determining chromaticity correction coefficients corresponding to the tristimulus values of the lamp points respectively through the tristimulus values of the lamp points under a plurality of gray scales, so that the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points and the tristimulus values of the lamp points can form a more accurate linear corresponding relationship, therefore, the correction effect of correcting the display screen by adopting the chromaticity correction coefficients corresponding to the tristimulus values can be improved.
In one embodiment, after the step S106, the method further includes: acquiring an original color parameter value of a lamp point; and correcting the original color parameter value based on the correction coefficient to obtain the corrected color parameter value of the lamp point.
Wherein the original color parameter values comprise an original luminance value and an original tristimulus value.
The correction coefficient comprises a luminance correction coefficient and a chrominance correction coefficient corresponding to the tristimulus value.
In a specific implementation, after obtaining an original brightness value and an original tristimulus value of a lamp point, the brightness of the lamp point can be corrected by adopting a brightness correction coefficient to obtain a corrected brightness value of the lamp point, and the tristimulus values of the lamp point are respectively corrected by adopting chromaticity correction coefficients corresponding to the tristimulus values to obtain the corrected tristimulus values. More specifically, when the tristimulus values of the lamp point are corrected, the red stimulus values in the tristimulus values may be corrected by using the correction coefficient of the red component, the green stimulus values in the tristimulus values may be corrected by using the correction coefficient of the green component, and the blue stimulus values in the tristimulus values may be corrected by using the correction coefficient of the blue component.
In practical application, the brightness and chromaticity of the lamp point in the LED display screen can be corrected based on the chromaticity equation C = X [ X ] + Y [ Y ] + Z [ Z ], wherein X, Y, Z is the tristimulus value of the lamp point, and the tristimulus value of the two mixed colors is the sum of the tristimulus values of all the component colors. In addition, for convenience of calculation, the luminance is generally determined only by [ Y ] primary colors of the three primary colors, i.e., the [ Y ] primary colors of the three primary colors represent both chromaticity and luminance, and the [ X ] and [ Z ] primary colors represent only chromaticity.
In this embodiment, the brightness of the lamp point is corrected by using the brightness value of the lamp point, the tristimulus values of the lamp point are respectively corrected by using the chromaticity correction coefficients corresponding to the tristimulus values of the lamp point, and the brightness and the tristimulus values of the lamp point and the correction coefficients respectively form more correct linear correspondence, so that the uniformity of the brightness and the chromaticity of the display screen is improved when the brightness correction and the chromaticity correction are performed by using the respective correction coefficients, thereby ensuring a good correction effect.
In another embodiment, as shown in fig. 4, a method for determining a correction coefficient of a display lamp point is provided, where the method includes the following steps:
step S402, acquiring an original image of a display screen to be corrected;
step S404, aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales; the color parameter values include a luminance value and a tristimulus value;
step S406, acquiring gamma values of a plurality of preset gray scales; the plurality of gray scales comprise a first gray scale, a second gray scale and a highest gray scale;
step S408, acquiring the ratio of the gamma value of the first gray scale to the gamma value of the highest gray scale as a first correction coefficient; the first correction coefficient is a first brightness correction coefficient or a first chrominance correction coefficient;
step S410, acquiring the ratio of the gamma value of the second gray scale to the gamma value of the highest gray scale as a second correction coefficient; the second correction coefficient is a second brightness correction coefficient or a second chrominance correction coefficient;
step S412, obtaining a target color parameter value of the lamp point, and obtaining a correction coefficient of the lamp point according to the target color parameter value, the first correction coefficient, the second correction coefficient and the color parameter value under each gray scale;
step S412a, when the color parameter value is a brightness value, obtaining a brightness correction coefficient of the light point according to the target brightness value, the first brightness correction coefficient, the second brightness correction coefficient, and the brightness value under each gray scale;
step S412b, when the color parameter value is a tristimulus value, obtaining chromaticity correction coefficients corresponding to the tristimulus values of the lamp point according to the target tristimulus value, the first chromaticity correction coefficient, the second chromaticity correction coefficient, and the tristimulus values under the plurality of gray scales.
The method for determining the correction coefficient of the lamp point of the display screen provided by the embodiment can enable the luminance and the tristimulus value of the lamp point to form more accurate linear corresponding relations with the correction coefficient respectively in the process of high-luminance multi-gray-scale luminance correction and chrominance correction, so that when the luminance correction and the chrominance correction are respectively carried out through the chrominance correction coefficients corresponding to the luminance correction coefficient and the tristimulus value, the luminance and the chrominance are more uniform, and a good correction effect is ensured.
It should be understood that although the steps in the flowcharts of fig. 1, 2 and 4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1, 2 and 4 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 5, there is provided a correction coefficient determining apparatus for a display lamp spot, including: an image acquisition module 502, a data acquisition module 504, and a coefficient determination module 506, wherein:
an image obtaining module 502, configured to obtain an original image of a display screen to be corrected;
a data acquisition module 504, configured to acquire, for any light point in the original image, color parameter values of the light point under a plurality of preset gray scales respectively;
and the coefficient determining module 506 is configured to obtain a target color parameter value of the lamp point, and obtain a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
In one embodiment, if the color parameter value is a luminance value, the coefficient determining module 506 is specifically configured to obtain gamma values of a plurality of gray scales; the plurality of gray scales comprise a first gray scale, a second gray scale and a third gray scale; obtaining a first brightness correction coefficient and a second brightness correction coefficient according to the gamma value of each gray scale; and obtaining the brightness correction coefficient of the lamp point according to the target brightness value, the first brightness correction coefficient, the second brightness correction coefficient and the brightness value under each gray scale.
In an embodiment, the coefficient determining module 506 is further configured to obtain a ratio of a gamma value of the first gray scale to a gamma value of the third gray scale as a first brightness correction coefficient; and acquiring the ratio of the gamma value of the second gray scale to the gamma value of the third gray scale as a second brightness correction coefficient.
In one embodiment, the brightness correction factor for the lamp point is obtained by the following relation:
Figure 463250DEST_PATH_IMAGE043
wherein the content of the first and second substances,p brightness of lightA brightness correction coefficient representing a lamp point,d 1which represents a first luminance correction coefficient, is,d 2which represents the second luminance correction coefficient, is,Lwhich represents the brightness value of the object,L 1indicating a first brightness value of the lamp point at a first gray level,L 2representing a second luminance value of the lamp point at a second gray scale.
In one embodiment, if the color parameter value is a tristimulus value, the coefficient determining module 506 is further configured to obtain gamma values of a plurality of gray scales; the plurality of gray scales comprise a low gray scale, a first gray scale, a second gray scale and a third gray scale; gamma value gamma according to low gray scale0Gamma value gamma of the first gray scale1Gamma value gamma of the second gray scale2Gamma value gamma of the third gray scale to obtain a low gray scale chromaticity correction coefficientp 0=γ0Gamma, first chroma correction factorp 1=γ1Gamma, and second chroma correction factorp 2=γ2Gamma; according to the target tristimulus value: rd, Gd, Bd, low gray scale chromaticity correction coefficientp 0First chroma correction factorp 1Second chroma correction factorp 2Tristimulus values at low grey scale: r0、G0、B0The tristimulus value under the first gray scale: r1、G1、B1And tristimulus values at the second gray scale: r2、G2、B2Obtaining chromaticity correction coefficients corresponding to the tristimulus values of the lamp points;
wherein the tristimulus values at low grey scale are:
Figure 350435DEST_PATH_IMAGE044
，
the tristimulus values at the first gray level are:
Figure 174034DEST_PATH_IMAGE003
，
the tristimulus values at the second grey scale are:
Figure 936192DEST_PATH_IMAGE004
，
the target tristimulus values are:
Figure 161637DEST_PATH_IMAGE005
。
in an embodiment, the coefficient determining module 506 is further configured to obtain a relation that reaches the target color gamut:
Figure 219722DEST_PATH_IMAGE006
，
Figure 796197DEST_PATH_IMAGE029
and
Figure 597931DEST_PATH_IMAGE036
(ii) a Obtaining coefficients according to the three relations to achieve the target color gamut
Figure 84407DEST_PATH_IMAGE009
、
Figure 703607DEST_PATH_IMAGE010
And
Figure 878630DEST_PATH_IMAGE011
respectively as follows:
Figure 608689DEST_PATH_IMAGE012
，
Figure 684092DEST_PATH_IMAGE045
and
Figure 349560DEST_PATH_IMAGE046
(ii) a Using tristimulus values of the first gray scaleR 1、G 1、B 1Tristimulus values instead of the low gray levelsR 0、G 0、B 0To obtain substituted coefficients
Figure 369469DEST_PATH_IMAGE009
、
Figure 778584DEST_PATH_IMAGE010
And
Figure 833128DEST_PATH_IMAGE011
respectively as follows:
Figure 168032DEST_PATH_IMAGE047
(ii) a According to substituted coefficients
Figure 409658DEST_PATH_IMAGE009
、
Figure 481519DEST_PATH_IMAGE010
And
Figure 531514DEST_PATH_IMAGE011
the chromaticity correction coefficients corresponding to the tristimulus values of the lamp point are respectively obtained by the following relational expression:
Figure 397839DEST_PATH_IMAGE016
。
in one embodiment, the device further comprises a correction module for obtaining the original color parameter value of the lamp point; and correcting the original color parameter value based on the correction coefficient to obtain the corrected color parameter value of the lamp point.
It should be noted that, the device for determining the correction coefficient of the display screen light point of the present application corresponds to the method for determining the correction coefficient of the display screen light point of the present application one to one, and the technical features and the beneficial effects thereof described in the embodiments of the method for determining the correction coefficient of the display screen light point of the present application are all applicable to the embodiments of the device for determining the correction coefficient of the display screen light point, and specific contents can be referred to the description in the embodiments of the method of the present application, and are not repeated herein, and thus, the description is hereby made. In addition, all or part of the modules in the device for determining the correction coefficient of the display screen lamp point can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 6. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of determining a correction factor for a display lamp spot. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring an original image of a display screen to be corrected;
aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales respectively;
and acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring an original image of a display screen to be corrected;
aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales respectively;
and acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method for determining a correction coefficient of a display screen light point is characterized by comprising the following steps:
acquiring an original image of a display screen to be corrected;
aiming at any lamp point in the original image, collecting color parameter values of the lamp point under a plurality of preset gray scales respectively;
and acquiring a target color parameter value of the lamp point, and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
2. The method according to claim 1, wherein if the color parameter value is a luminance value, the obtaining a correction coefficient of the light point in the display screen to be corrected according to the target color parameter value and the color parameter value at each gray scale comprises:
acquiring gamma values of the plurality of gray scales; the plurality of gray scales comprise a first gray scale, a second gray scale and a third gray scale;
obtaining a first brightness correction coefficient and a second brightness correction coefficient according to the gamma value of each gray scale;
and obtaining the brightness correction coefficient of the lamp point according to a target brightness value, the first brightness correction coefficient, the second brightness correction coefficient and the brightness value under each gray scale.
3. The method of claim 2, wherein obtaining a first luminance correction factor and a second luminance correction factor according to the gamma value of each gray scale comprises:
acquiring the ratio of the gamma value of the first gray scale to the gamma value of the third gray scale as a first brightness correction coefficient;
and acquiring the ratio of the gamma value of the second gray scale to the gamma value of the third gray scale as a second brightness correction coefficient.
4. A method according to any one of claims 2-3, wherein the brightness correction factor for the lamp spot is obtained by the following relation:
Figure DEST_PATH_IMAGE001
wherein the content of the first and second substances,p brightness of lightA brightness correction coefficient representing the lamp point,d 1which represents a first luminance correction coefficient, is,d 2which represents the second luminance correction coefficient, is,Lwhich represents the brightness value of the object,L 1indicating a first brightness value of the lamp point at a first gray level,L 2representing a second luminance value of the lamp point at a second gray scale.
5. The method according to claim 1, wherein if the color parameter value is a tristimulus value, the obtaining a correction coefficient of the light point in the display screen to be corrected according to the target color parameter value and the color parameter value at each gray scale comprises:
acquiring gamma values of the plurality of gray scales; the plurality of gray scales comprise a low gray scale, a first gray scale, a second gray scale and a third gray scale;
gamma value gamma according to the low gray scale0Gamma value gamma of the first gray scale1Gamma value gamma of the second gray scale2And gamma value gamma of the third gray scale to obtain a low gray scale chromaticity correction coefficientp 0=γ0Gamma, first chroma correction factorp 1=γ1Gamma, and second chroma correction factorp 2=γ2/γ；
According to the target tristimulus value: rd, Gd, Bd, the low gray scale chromaticity correction coefficientp 0The first chroma correction coefficientp 1The second chroma correction factorp 2The tristimulus value at low gray scale: r0、G0、B0And the tristimulus value under the first gray scale: r1、G1、B1And a tristimulus value at the second gray scale: r2、G2、B2Obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points respectively;
wherein the tristimulus values at low grey scale are:
Figure 996115DEST_PATH_IMAGE002
，
the tristimulus values at the first gray level are:
Figure DEST_PATH_IMAGE003
，
the tristimulus values at the second grey scale are:
Figure 511148DEST_PATH_IMAGE004
，
the target tristimulus values are:
Figure DEST_PATH_IMAGE005
。
6. the method of claim 5, wherein the method is based onTarget tristimulus value: rd, Gd, Bd, the low gray scale chromaticity correction coefficientp 0The first chroma correction coefficientp 1The second chroma correction factorp 2The tristimulus value at low gray scale: r0、G0、B0And the tristimulus value under the first gray scale: r1、G1、B1And a tristimulus value at the second gray scale: r2、G2、B2Obtaining the chromaticity correction coefficients corresponding to the tristimulus values of the lamp points respectively, comprising:
obtaining a relational expression for achieving the target color gamut:
Figure 946808DEST_PATH_IMAGE006
、
Figure DEST_PATH_IMAGE007
and
Figure 390559DEST_PATH_IMAGE008
；
obtaining coefficients according to the three relational expressions for achieving the target color gamut
Figure DEST_PATH_IMAGE009
、
Figure 872356DEST_PATH_IMAGE010
And
Figure DEST_PATH_IMAGE011
respectively as follows:
Figure 692544DEST_PATH_IMAGE012
，
Figure DEST_PATH_IMAGE013
and
Figure 484176DEST_PATH_IMAGE014
；
using tristimulus values of the first gray scaleR 1、G 1、B 1Tristimulus values instead of the low gray levelsR 0、G 0、B 0To obtain substituted coefficients
Figure DEST_PATH_IMAGE015
、
Figure 364408DEST_PATH_IMAGE016
And
Figure 208867DEST_PATH_IMAGE011
respectively as follows:
Figure DEST_PATH_IMAGE017
according to substituted coefficients
Figure 567167DEST_PATH_IMAGE018
、
Figure 570895DEST_PATH_IMAGE010
And
Figure 323825DEST_PATH_IMAGE011
the chromaticity correction coefficients corresponding to the tristimulus values of the lamp point are respectively obtained by the following relational expression:
Figure DEST_PATH_IMAGE019
。
7. the method according to claim 1, further comprising, after obtaining the correction coefficients of the light points in the display screen to be corrected according to the target color parameter values and the color parameter values at the respective gray levels, the steps of:
acquiring an original color parameter value of the lamp point;
and correcting the original color parameter value based on the correction coefficient to obtain the corrected color parameter value of the lamp point.
8. A device for determining correction coefficients for a lamp spot of a display screen, the device comprising:
the image acquisition module is used for acquiring an original image of the display screen to be corrected;
the data acquisition module is used for acquiring color parameter values of any lamp point in the original image under a plurality of preset gray scales;
and the coefficient determining module is used for acquiring a target color parameter value of the lamp point and acquiring a correction coefficient of the lamp point in the display screen to be corrected according to the target color parameter value and the color parameter value under each gray scale.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111862880A (en) * 2019-04-15 2020-10-30 西安诺瓦电子科技有限公司 Method for acquiring multi-color gamma correction table and display control method, device and system
CN113763873A (en) * 2021-09-13 2021-12-07 北京集创北方科技股份有限公司 Correction method, system and device of LED display screen, electronic equipment and storage medium
CN113903285A (en) * 2021-09-09 2022-01-07 西安诺瓦星云科技股份有限公司 Display unit correction method, device and computer readable storage medium
CN113936590A (en) * 2021-10-26 2022-01-14 卡莱特云科技股份有限公司 Brightness correction method and device based on virtual pixel LED display screen and display system
CN113936589A (en) * 2021-10-26 2022-01-14 卡莱特云科技股份有限公司 Virtual pixel correction method and device
CN114067731A (en) * 2021-11-27 2022-02-18 卡莱特云科技股份有限公司 Low gray scale correction method and device for LED display screen and brightness correction system
CN114299857A (en) * 2021-12-30 2022-04-08 卡莱特云科技股份有限公司 Multilayer correction method and device for LED display screen and computer equipment
CN114327339A (en) * 2021-12-29 2022-04-12 卡莱特云科技股份有限公司 LED display screen simulation correction display method and device and electronic equipment
CN114582278A (en) * 2022-05-05 2022-06-03 卡莱特云科技股份有限公司 Method, device and system for adjusting brightness correction coefficient of LED display screen
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WO2023000631A1 (en) * 2021-07-21 2023-01-26 卡莱特云科技股份有限公司 Method and apparatus for determining correction coefficient of display screen light point, and computer device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101447173A (en) * 2008-12-22 2009-06-03 北京巨数数字技术开发有限公司 System for adjusting point-to-point brightness in a plant and method
CN101650908A (en) * 2009-07-20 2010-02-17 北京巨数数字技术开发有限公司 Benchmark brightness obtaining method, point-to-point correction system and correction method
CN101916539A (en) * 2010-08-20 2010-12-15 西安诺瓦电子科技有限公司 System and method for correcting brightness and chromaticity of LED display screen point by point
WO2013091542A1 (en) * 2011-12-20 2013-06-27 深圳市奥拓电子股份有限公司 Led display screen point-by-point correction system and point-by-point correction method
US20140146090A1 (en) * 2012-11-23 2014-05-29 Samsung Display Co., Ltd. Method of storing gamma data in a display device, display device and method of operating a display device
CN104299565A (en) * 2014-10-13 2015-01-21 西安诺瓦电子科技有限公司 Low grey scale correction method and system of LED display device
CN104464623A (en) * 2014-12-05 2015-03-25 西安诺瓦电子科技有限公司 Method and device for adjusting low gray scales of LED
CN109036333A (en) * 2018-09-17 2018-12-18 广州视源电子科技股份有限公司 Display parameters bearing calibration, device, terminal device and the storage medium of display
CN112201203A (en) * 2020-12-07 2021-01-08 卡莱特（深圳）云科技有限公司 Method and device for determining brightness gradient error of LED display screen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001209358A (en) * 2000-01-26 2001-08-03 Seiko Epson Corp Correction of irregularity in display image
JP4923863B2 (en) * 2005-10-07 2012-04-25 セイコーエプソン株式会社 Image display system, image display apparatus, and image correction processing program
CN101377918B (en) * 2008-09-19 2013-02-27 李鑫 Electronic display screen system, method and system for correcting electronic display screen brightness
CN101436394B (en) * 2008-12-22 2013-02-27 李鑫 Liquid crystal display adjustment device, liquid crystal display device and image signal processing method
CN113284456B (en) * 2021-07-21 2021-12-10 卡莱特云科技股份有限公司 Method and device for determining correction coefficient of display screen lamp point and computer equipment

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101447173A (en) * 2008-12-22 2009-06-03 北京巨数数字技术开发有限公司 System for adjusting point-to-point brightness in a plant and method
CN101650908A (en) * 2009-07-20 2010-02-17 北京巨数数字技术开发有限公司 Benchmark brightness obtaining method, point-to-point correction system and correction method
CN101916539A (en) * 2010-08-20 2010-12-15 西安诺瓦电子科技有限公司 System and method for correcting brightness and chromaticity of LED display screen point by point
WO2013091542A1 (en) * 2011-12-20 2013-06-27 深圳市奥拓电子股份有限公司 Led display screen point-by-point correction system and point-by-point correction method
US20140146090A1 (en) * 2012-11-23 2014-05-29 Samsung Display Co., Ltd. Method of storing gamma data in a display device, display device and method of operating a display device
CN104299565A (en) * 2014-10-13 2015-01-21 西安诺瓦电子科技有限公司 Low grey scale correction method and system of LED display device
CN104464623A (en) * 2014-12-05 2015-03-25 西安诺瓦电子科技有限公司 Method and device for adjusting low gray scales of LED
CN109036333A (en) * 2018-09-17 2018-12-18 广州视源电子科技股份有限公司 Display parameters bearing calibration, device, terminal device and the storage medium of display
CN112201203A (en) * 2020-12-07 2021-01-08 卡莱特（深圳）云科技有限公司 Method and device for determining brightness gradient error of LED display screen

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111862880A (en) * 2019-04-15 2020-10-30 西安诺瓦电子科技有限公司 Method for acquiring multi-color gamma correction table and display control method, device and system
WO2023000631A1 (en) * 2021-07-21 2023-01-26 卡莱特云科技股份有限公司 Method and apparatus for determining correction coefficient of display screen light point, and computer device
CN113903285A (en) * 2021-09-09 2022-01-07 西安诺瓦星云科技股份有限公司 Display unit correction method, device and computer readable storage medium
CN113763873A (en) * 2021-09-13 2021-12-07 北京集创北方科技股份有限公司 Correction method, system and device of LED display screen, electronic equipment and storage medium
CN113936589B (en) * 2021-10-26 2022-09-30 卡莱特云科技股份有限公司 Virtual pixel brightness and chrominance correction method and device
CN113936590B (en) * 2021-10-26 2022-09-16 卡莱特云科技股份有限公司 Brightness correction method and device based on virtual pixel LED display screen and display system
CN113936589A (en) * 2021-10-26 2022-01-14 卡莱特云科技股份有限公司 Virtual pixel correction method and device
CN113936590A (en) * 2021-10-26 2022-01-14 卡莱特云科技股份有限公司 Brightness correction method and device based on virtual pixel LED display screen and display system
CN114067731A (en) * 2021-11-27 2022-02-18 卡莱特云科技股份有限公司 Low gray scale correction method and device for LED display screen and brightness correction system
CN114327339A (en) * 2021-12-29 2022-04-12 卡莱特云科技股份有限公司 LED display screen simulation correction display method and device and electronic equipment
CN114327339B (en) * 2021-12-29 2024-04-12 卡莱特云科技股份有限公司 LED display screen simulation correction display method and device and electronic equipment
CN114299857A (en) * 2021-12-30 2022-04-08 卡莱特云科技股份有限公司 Multilayer correction method and device for LED display screen and computer equipment
CN114299857B (en) * 2021-12-30 2023-05-30 卡莱特云科技股份有限公司 LED display screen multilayer correction method and device and computer equipment
CN114582278A (en) * 2022-05-05 2022-06-03 卡莱特云科技股份有限公司 Method, device and system for adjusting brightness correction coefficient of LED display screen
CN114582278B (en) * 2022-05-05 2022-07-15 卡莱特云科技股份有限公司 Method, device and system for adjusting brightness correction coefficient of LED display screen
CN114927091A (en) * 2022-05-30 2022-08-19 卡莱特云科技股份有限公司 Heat shield effect processing method, device and system of LED display screen
CN114927091B (en) * 2022-05-30 2023-11-28 卡莱特云科技股份有限公司 Thermal screen effect processing method, device and system for LED display screen

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