CN113393805A

CN113393805A - RGB (red, green and blue) three-color gamma correction method and system for LED display screen and computer storage medium thereof

Info

Publication number: CN113393805A
Application number: CN202110708194.0A
Authority: CN
Inventors: 罗维; 郭畅; 刘定
Original assignee: Shenzhen Uniview Led Co ltd
Current assignee: Shenzhen Uniview Led Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-09-14
Anticipated expiration: 2041-06-24
Also published as: CN113393805B

Abstract

The method comprises a brightness measuring step, an initial brightness calculating step, an initial parameter value calculating step, a theoretical brightness table generating step and a correction gray scale value calculating step, wherein the measured brightness value, the initial parameter value and the theoretical brightness value of RGB three colors of image data are respectively obtained, and the correction gray scale value of each gray scale level of R color is obtained through the R color measured brightness value and the R color theoretical brightness value; acquiring a correction gray scale value of each gray scale of the G color through the G color measurement brightness value and the G color theoretical brightness value; and acquiring the corrected gray-scale value of each gray level of the B color through the B color measurement brightness value and the B color theoretical brightness value, so that the gray-scale values of the three RGB colors in the image data are independently corrected, and the image data is redisplayed according to the corrected gray-scale values, thereby reducing the color cast problem and realizing the white balance of each level of 1-255.

Description

RGB (red, green and blue) three-color gamma correction method and system for LED display screen and computer storage medium thereof

Technical Field

The present application relates to the technical field of LED display screen devices, and in particular, to a RGB three-color gamma correction method and system for an LED display screen, and a storage medium thereof.

Background

The gamma curve in the LED display screen refers to the mapping relation between the brightness of natural reality and subjective visual brightness,this relationship is usually defined by a power function Y ═ X^gWhere Y is the luminance of natural reality, X is the subjective visual luminance, and g is the gamma value. The gamma correction of the LED display screen is to measure the brightness of each gray scale of the display screen through an optical device, adjust the gray scale value through the measured brightness value, and display the image data according to the adjusted gray scale value, so that the image data fits the brightness curve of the specified gamma value g (such as 2.2 or 2.8). The gamma correction adopted by the LED display screen at present uses one gamma table, namely the gamma tables of the three colors of RGB are the same.

Aiming at the related technology, because the electro-optic characteristics of the red, green and blue lamp beads are inconsistent, the brightness of each gray level can not reach the white balance easily because the three colors of RGB adopt one gamma table.

Disclosure of Invention

The invention aims to provide an RGB (red, green and blue) three-color gamma correction method for an LED display screen, which can improve the phenomenon that the brightness of each gray scale of RGB three colors cannot reach white balance.

The above object of the present invention is achieved by the following technical solutions:

a RGB tristimulus gamma correction method for an LED display screen, the method comprising:

measuring brightness, namely measuring the brightness value of each gray scale of the R color based on image data to generate an R color measurement brightness table, and acquiring the maximum brightness R of the R color according to the R color measurement brightness table_M(ii) a Measuring the brightness value of each gray scale of the G color based on the image data to generate a G color measurement brightness table, and acquiring the maximum brightness G of the G color according to the G color measurement brightness table_M(ii) a Measuring the brightness value of each gray scale of the B color based on the image data to generate a B color measurement brightness table, and acquiring the maximum brightness B of the B color according to the B color measurement brightness table_M；

Calculating initial brightness, setting white initial brightness V of image data_SCalculating the initial brightness R of the R color_SG color initial luminance G_SAnd initial brightness B of color B_SWherein, in the step (A),

R_S＝V_S·R_M/(R_M+G_M+B_M)，

G_S＝V_S·G_M/(R_M+G_M+B_M)，

B_S＝V_S·B_M/(R_M+G_M+B_M)；

calculating initial parameter value, calculating R color initial parameter value R_PG color initial parameter value G_PAnd initial parameter value B of color B_PWherein, in the step (A),

R_p＝exp(ln(R_S/R_M) G) is a gamma value,

G_p＝exp(ln(G_S/G_M) G) is a gamma value,

B_p＝exp(ln(B_S/B_M) G) g is a gamma value;

generating a theoretical brightness table, calculating the theoretical brightness value S of each gray level j of R color_R(j) Based on the theoretical brightness value S of each gray level j of the R color_R(j) Generating an R color theoretical brightness table; calculating theoretical brightness value S at each gray level j of G color_G(j) Based on the theoretical brightness value S of each gray level j of the G color_G(j) Generating a G color theoretical brightness table; calculating theoretical brightness value S at each gray level j of B color_B(j) Based on the theoretical brightness value S of the B color at each gray level j_B(j) Generating a B color theoretical brightness table, wherein j is an integer which is more than or equal to 1 and less than or equal to 255,

S_R(j)＝pow(R_p+(j-1)·(1-R_p)/254，g)·R_Mand g is a gamma value,

S_G(j)＝pow(G_p+(j-1)·(1-G_p)/254，g)·G_Mand g is a gamma value,

S_B(j)＝pow(B_p+(j-1)·(1-B_p)/254，g)·B_Mg is a gamma value;

calculating a corrected gray scale value, namely calculating an R color corrected gray scale value based on an R color theoretical brightness value and an R color measured brightness value, specifically, calculating error absolute values of the R color theoretical brightness value and the measured brightness values of all gray scales in an R color measured brightness table respectively, obtaining a gray scale value corresponding to the R color measured brightness value corresponding to the minimum error absolute value, and taking the gray scale value as the corrected gray scale value corresponding to the gray scale level in the R color theoretical brightness table;

calculating a G color correction gray scale value based on the G color theoretical brightness value and the G color measurement brightness value, specifically, calculating error absolute values of the G color theoretical brightness value and the measurement brightness value of each gray scale in the G color measurement brightness table respectively, obtaining a gray scale value corresponding to the G color measurement brightness value corresponding to the minimum error absolute value, and taking the gray scale value as a correction gray scale value corresponding to a gray scale level in the G color theoretical brightness table;

and calculating a B color correction gray scale value based on the B color theoretical brightness value and the B color measurement brightness value, specifically, calculating error absolute values of the B color theoretical brightness value and the measurement brightness value of each gray scale in the B color measurement brightness table respectively, obtaining a gray scale value corresponding to the B color measurement brightness value corresponding to the minimum error absolute value, and taking the gray scale value as a correction gray scale value corresponding to the gray scale in the B color theoretical brightness table.

By adopting the technical scheme, the measurement brightness value, the initial parameter value and the theoretical brightness value of RGB three colors in the image data are respectively obtained, and the correction gray scale value of each gray scale of R color is obtained through the R color measurement brightness value and the R color theoretical brightness value; acquiring a correction gray scale value of each gray scale of the G color through the G color measurement brightness value and the G color theoretical brightness value; the corrected gray scale values of all gray levels of the B color are obtained through the B color measurement brightness value and the B color theoretical brightness value, so that the gray scale values of the RGB three colors in the image data are independently corrected, the image data can be redisplayed according to the corrected gray scale values, the color cast problem is reduced, and the white balance of each gray level of 1-255 is realized.

Optionally, the method before the step of calculating a correction gray scale value further includes: setting a R color low brightness threshold R_TMeasuring the R color brightness value of each gray scale and the R color low brightness threshold value R_TComparing if the measured brightness value of the R color is less than or equal to the low brightness threshold value R of the R color_TCalculating an R color correction gray scale value based on the R color theoretical brightness value and the R color measurement brightness value; if the measured brightness value of the R color is larger than the low brightness threshold value R of the R color_TThen the measured brightness value of the R color is larger than the low brightness threshold value R of the R color_TIs divided into N sections, and the node of each section is set as a key point N_RObtaining each key point N_RGenerating an R color key point brightness table, and calculating an R color correction gray scale value based on the R color key point brightness table and the R color theoretical brightness table, wherein N is an integer greater than 0;

setting a G color low luminance threshold G_TMeasuring the brightness value of G color of each gray scale and the low brightness threshold value G of G color_TComparing if the measured brightness value of the G color is less than or equal to the low brightness threshold G of the G color_TCalculating a G color correction gray scale value based on the G color theoretical brightness value and the G color measurement brightness value; if the measured brightness value of the G color is larger than the low brightness threshold value G of the G color_TThen the measured brightness value of the G color is larger than the low brightness threshold value G of the G color_TIs divided into N sections, and the node of each section is set as a key point N_GObtaining each key point N_GGenerating a G color key point brightness table, and calculating a G color correction gray scale value based on the G color key point brightness table and the G color theoretical brightness table, wherein N is an integer greater than 0;

setting a B color low brightness threshold B_TMeasuring the brightness value of the B color of each gray scale and the low brightness threshold value B of the B color_TComparing if the measured brightness value of the B color is less than or equal to the low brightness threshold value B of the B color_TCalculating a B color correction gray scale value based on the B color theoretical brightness value and the B color measurement brightness value; if the measured brightness value of the B color is larger than the low brightness threshold value B of the B color_TThen the measured brightness value of the color B is larger than the low brightness threshold value B of the color B_TIs divided into N sections, and the node of each section is set as a key point N_BObtaining each key point N_BAnd generating a B color key point brightness table, and calculating a B color correction gray scale value based on the B color key point brightness table and the B color theoretical brightness table, wherein N is an integer greater than 0.

By adopting the technical scheme, as the current lamp bead manufacturing technology and the technology of driving the IC are continuously improved, the gray scale expression capacity of the LED display screen is greatly improved, the gray scale value is increased, and the measurement time is prolonged by measuring the brightness value of RGB (red, green and blue) by gray scale. Human eyes are sensitive to the perception of the part with lower brightness and insensitive to the perception of the part with higher brightness, and the human eyes can only perceive the brightness change when the brightness change is large. Therefore, each gray scale brightness value is divided into two parts according to the low brightness threshold value, the parts smaller than or equal to the low brightness threshold value are corrected one by one, key points are arranged at intervals of the parts larger than the low brightness threshold value, and correction is carried out according to the brightness value at the key points, so that the measurement duration can be reduced, and the working efficiency can be improved.

Optionally, the method for setting the low brightness threshold specifically includes setting a white low brightness threshold V in the image data_TCalculating R color low brightness threshold value R_TG color low luminance threshold value G_TAnd a low luminance threshold B of the B color_TWherein, in the step (A),

R_T＝V_T*R_M/(R_M+G_M+B_M)，

G_T＝V_T*G_M/(R_M+G_M+B_M)，

B_T＝V_T*B_M/(R_M+G_M+B_M)。

by adopting the technical scheme, when the brightness is low, human eyes are sensitive to the perception of brightness change, when the brightness is high, the human eyes are insensitive to the perception of brightness change, and the sensitive and insensitive intervals of human eyes can be distinguished conveniently by using the low brightness threshold value.

Optionally, the specific method for measuring the brightness values of the R color gray scales based on the image data and generating the R color measurement brightness table includes sequentially connecting the R color measurement brightness values of the R color gray scales with the R color low brightness threshold R from small to large_TComparing if the measured brightness value of R color is greater than the low brightness threshold value R of R color_TThe comparison is stopped, if the measured brightness value of the R color is less than or equal to the low brightness threshold value R of the R color_TGenerating an R color low brightness measuring table according to the R color measuring brightness value;

the specific method for measuring the brightness value of each gray scale of the G color based on the image data and generating the G color measurement brightness table comprises the steps of sequentially connecting the G color measurement brightness value of each gray scale with a G color low brightness threshold value G from small to large_TMaking a comparison, if G color measures brightnessValue greater than G color low luminance threshold G_TThe comparison is stopped, if the measured brightness value of the G color is less than or equal to the low brightness threshold value G of the G color_TGenerating a G color low brightness measuring meter according to the G color measuring brightness value;

the specific method for measuring the brightness values of all gray scales of the B color based on the image data and generating the B color measurement brightness table comprises the steps of sequentially connecting the B color measurement brightness values of all gray scales with a B color low brightness threshold B from small to large_TComparing if the measured brightness value of B color is greater than the low brightness threshold value B of B color_TThe comparison is stopped, if the measured brightness value of the B color is less than or equal to the low brightness threshold value B of the B color_TAnd generating a B color low brightness measuring table according to the B color measuring brightness value.

By adopting the technical scheme, human eyes are very sensitive to brightness change when the brightness is low, so that the brightness value of the part with the brightness smaller than the low brightness threshold value needs to be measured gray scale by gray scale to generate a low brightness measuring table, and then the part needs to be corrected one by one based on the measured brightness value and the theoretical brightness value, so that the corrected gray scale value accords with the perception curve of the human eyes.

Optionally, obtaining each key point N_RThe method before luminance value of (A) further comprises equaling the R color low luminance threshold R_TOr greater than and closest to the R color low brightness threshold R_TThe gray scale RSL corresponding to the R color measurement brightness value_TTo maximum R color gray scale SL_MAveragely divided into N sections, and each section of nodes is a key point N_RCalculating a key point N according to the corresponding gray level value_RCorresponding gray scale value RSL_i＝RSL_T+(SL_M-RSL_T) The key points are arranged in the same row, wherein i is the serial number of the key points, and i is an integer which is more than or equal to 1 and less than or equal to N;

obtaining each key point N_GThe method before luminance value of (A) further comprises equaling the G color low luminance threshold G_TOr greater than and closest to the G color low brightness threshold G_TG color measurement gray scale GSL corresponding to the brightness value_TTo maximum R color gray scale SL_MAveragely divided into N sections, and each section of nodes is a key point N_GCalculating a key point N according to the corresponding gray level value_GCorresponding gray scale value GSL_i＝GSL_T+(SL_M-GSL_T) The key points are arranged in the same row, wherein i is the serial number of the key points, and i is an integer which is more than or equal to 1 and less than or equal to N;

obtaining each key point N_BThe method before processing the luminance value further comprises equaling a B color low luminance threshold B_TOr greater than and closest to the B color low luminance threshold B_TThe gray scale BSL corresponding to the B color measurement brightness value_TTo maximum gray scale SL of color B_MAveragely divided into N sections, and each section of nodes is a key point N_BCalculating a key point N according to the corresponding gray level value_BCorresponding gray scale value BSL_i＝BSL_T+(SL_M-RSL_T) and/N x i, wherein i is the serial number of the key point, and i is an integer which is greater than or equal to 1 and less than or equal to N.

By adopting the technical scheme, the gray-scale value corresponding to each key point is obtained and is used for measuring the brightness value corresponding to the gray-scale value.

Optionally, the specific method for generating the R color key illumination table is based on each key point N_RCorresponding gray scale value RSL_iMeasure each key point N_RThe brightness value of (1) is determined according to each key point N_RBrightness value of and each key point N_RGenerating an R color key lightening table by using the gray scale value;

the specific method for generating the G color key illumination table is based on each key point N_GCorresponding gray scale value GSL_iMeasure each key point N_GThe brightness value of (1) is determined according to each key point N_GBrightness value of and each key point N_GGenerating a G color measurement brightness table according to the gray scale value;

the specific method for generating the key illumination table of the B color is that each key point N is based on_BCorresponding gray scale value BSL_iMeasure each key point N_BThe brightness value of (1) is determined according to each key point N_BBrightness value of and each key point N_BThe gray scale value of (A) generates a B color measurement brightness table.

By adopting the technical scheme, the brightness values at the key points are measured according to the gray-scale values at the key points, and the brightness values at the key points are integrated to generate the key lighting table.

Optionally, the specific method for calculating the R color correction gray scale value based on the R color key point brightness table and the R color theoretical brightness table is to obtain the position of the R color theoretical brightness value at each gray level in the R color key point brightness table, and calculate the R color correction gray scale value by using a linear interpolation method;

the specific method for calculating the G color correction gray scale value based on the G color key point brightness table and the G color theoretical brightness table comprises the steps of obtaining the position of the G color theoretical brightness value at each gray level in the G color key point brightness table, and calculating the G color correction gray scale value by adopting a linear interpolation method;

the specific method for calculating the B color correction gray scale value based on the B color key point brightness table and the B color theoretical brightness table is to obtain the position of the B color theoretical brightness value at each gray level in the B color key point brightness table and calculate the B color correction gray scale value by adopting a linear interpolation method.

By adopting the technical scheme, the linear interpolation method can determine the unknown quantity through the known quantity, so that the position of the theoretical brightness value in the key brightness table is obtained, and the gray-scale values corresponding to two key points adjacent to the theoretical brightness value are substituted into the linear interpolation formula, so that the corrected gray-scale value of the gray-scale level corresponding to the theoretical brightness value can be calculated.

The invention also aims to provide an RGB (red, green and blue) three-color gamma correction system of the LED display screen.

The second aim of the invention is realized by the following technical scheme:

an RGB tristimulus gamma correction system for an LED display screen, comprising:

a brightness measurement module for measuring brightness values of R gray scales based on image data, generating a R color measurement brightness table, and obtaining R color maximum brightness R according to the R color measurement brightness table_M(ii) a The method is used for measuring the brightness value of each gray scale of the G color based on the image data, generating a G color measurement brightness table and acquiring the maximum brightness G of the G color according to the G color measurement brightness table_M(ii) a Is used for measuring the brightness value of each gray scale of the B color based on the image data, generating a B color measurement brightness table and acquiring the maximum brightness B of the B color according to the B color measurement brightness table_M；

Module for calculating initial brightness and testA brightness measuring module connected to receive the maximum brightness R of R color_MMaximum brightness G of G color_MAnd maximum brightness B of B color_MAnd setting the initial white brightness V in the image data_SCalculating the initial brightness R of the R color_SG color initial luminance G_SAnd initial brightness B of color B_SWherein, in the step (A),

R_S＝V_S·R_M/(R_M+G_M+B_M)，

G_S＝V_S·G_M/(R_M+G_M+B_M)，

B_S＝V_S·B_M/(R_M+G_M+B_M)；

an initial parameter value calculating module connected with the brightness measuring module and the initial brightness calculating module for receiving the maximum brightness R of the R color_MMaximum brightness G of G color_MAnd maximum brightness B of B color_MAnd receiving the R color initial brightness R_SG color initial luminance G_SAnd initial brightness B of color B_SAnd calculating the R color initial parameter value R_PG color initial parameter value G_PAnd initial parameter value B of color B_PWherein R is_p＝exp(ln(R_S/R_M) G) is a gamma value,

G_p＝exp(ln(G_S/G_M) G) is a gamma value,

B_p＝exp(ln(B_S/B_M) G) g is a gamma value;

a theoretical brightness table generation module connected with the brightness measurement module and the initial parameter value calculation module and used for receiving the maximum brightness R of the R color_MMaximum brightness G of G color_MAnd maximum brightness B of B color_MAnd receiving the R color initial parameter value R_pG color initial parameter value G_pAnd initial parameter value B of color B_pAnd calculating theoretical brightness value S of R color at each gray level j_R(j) Based on the theoretical brightness value S of each gray level j of the R color_R(j) Generating an R color theoretical brightness table; calculating theoretical brightness value S at each gray level j of G color_G(j) Based on the theoretical brightness value S of each gray level j of the G color_G(j) Generating a G color theoretical brightness table; calculating theoretical brightness value S at each gray level j of B color_B(j) Based on the theoretical brightness value S of the B color at each gray level j_B(j) Generating a B color theoretical brightness table, wherein j is an integer which is more than or equal to 1 and less than or equal to 255,

S_R(j)＝pow(R_p+(j-1)·(1-R_p)/254，g)·R_Mand g is a gamma value,

S_G(j)＝pow(G_p+(j-1)·(1-G_p)/254，g)·G_Mand g is a gamma value,

S_B(j)＝pow(B_p+(j-1)·(1-B_p)/254，g)·B_Mg is a gamma value;

the calculation and correction gray scale value module is connected with the measurement brightness module and the theoretical brightness table generation module and is used for acquiring R color measurement brightness values and theoretical brightness values of all gray scales in the R color theoretical brightness table and calculating R color correction gray scale values based on the R color theoretical brightness values and the R color measurement brightness values, specifically, calculating error absolute values of the R color theoretical brightness values and the measurement brightness values of all gray scales in the R color measurement brightness table respectively, acquiring a gray scale value corresponding to the R color measurement brightness value corresponding to the minimum error absolute value, and taking the gray scale value as a correction gray scale value corresponding to the gray scale in the R color theoretical brightness table;

the gray scale correction method comprises the steps of obtaining a G color measurement brightness value and theoretical brightness values of all gray scales in a G color theoretical brightness table, and calculating a G color correction gray scale value based on the G color theoretical brightness value and the G color measurement brightness value, specifically, calculating error absolute values of the G color theoretical brightness value and the measurement brightness values of all gray scales in the G color measurement brightness table respectively, obtaining a gray scale value corresponding to the G color measurement brightness value corresponding to the minimum error absolute value, and taking the gray scale value as the correction gray scale value corresponding to the gray scale in the G color theoretical brightness table;

the method is used for obtaining a B color measurement brightness value and a theoretical brightness value of each gray level in a B color theoretical brightness table, and calculating a B color correction gray level value based on the B color theoretical brightness value and the B color measurement brightness value, specifically, calculating an error absolute value between the B color theoretical brightness value and the measurement brightness value of each gray level in the B color measurement brightness table, obtaining a gray level value corresponding to the B color measurement brightness value corresponding to the minimum error absolute value, and taking the gray level value as the correction gray level value corresponding to the gray level in the B color theoretical brightness table.

By adopting the technical scheme, the brightness measuring module is used for measuring the brightness values of RGB in the image data respectively, the initial brightness calculating module is used for calculating the initial brightness of RGB respectively, the initial parameter value calculating module is used for calculating the initial parameter values of RGB respectively, the theoretical brightness table generating module generates the theoretical brightness tables of RGB respectively, the gray scale value calculating and correcting module is used for calculating the corrected gray scale values of RGB three colors respectively according to the measured brightness values and the theoretical brightness values, the image data can be displayed again according to the corrected gray scale values, and the color cast problem can be improved.

The invention also provides a computer device.

The third object of the invention is realized by the following technical scheme:

a computer device comprising a memory and a processor, said memory having stored thereon a computer program that can be loaded by the processor and executed to perform any of the steps of the RGB tristimulus gamma correction method for an LED display screen described above.

The invention also provides a computer readable storage medium.

The fourth object of the invention is realized by the following technical scheme:

a computer-readable storage medium storing a computer program capable of being loaded and executing any one of the steps of the RGB three-color gamma correction method of the LED display panel described above.

In summary, the present application includes at least one of the following beneficial technical effects:

the RGB three colors in the image data are respectively and independently corrected, and the image data are displayed again according to the corrected gray scale values, so that the color cast problem is improved.

Drawings

Fig. 1 is a flowchart of an RGB tristimulus gamma correction method according to an embodiment of the present application.

Detailed Description

The present invention is described in further detail below with reference to fig. 1.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

The embodiment of the application provides a RGB three-color gamma correction method for an LED display screen, which specifically includes, with reference to fig. 1: the method comprises the steps of measuring brightness in step S100, calculating initial brightness in step S200, calculating initial parameter values in step S300, generating a theoretical brightness table in step S400 and calculating a corrected gray scale value in step S500.

The specific implementation manner of the step of measuring the brightness is that the image data is displayed through an LED box body with an LED display screen, the brightness value of each gray scale of R color, the brightness value of each gray scale of G color and the brightness value of each gray scale of B color in the image data are respectively measured by using a colorimeter, an R color measurement brightness table, a G color measurement brightness table and a B color measurement brightness table are generated, and the maximum brightness R of the R color is obtained according to the R color measurement brightness table_MObtaining the maximum brightness G of the G color according to the G color measurement brightness table_MAnd obtaining the maximum brightness B of the B color according to the B color measurement brightness table_M。

In combination with the embodiment, the measurement process is further explained by specific data, a certain LED box with an LED display screen is lighted, the gray scale display capability of the LED display screen is 16 bits, a colorimeter is called to measure the brightness value of each gray scale of R color, an R color measurement brightness table is generated, and the maximum brightness R of the R color is obtained according to the R color measurement brightness table_M309.1198, and then obtaining the maximum brightness G of the G color by the same method_M697.5598 maximum brightness B of color B_M＝122.4798。

As another specific implementation mode of the step of measuring the brightness, the gray scale expression capability of the LED display screen is greatly improved, the gray scale value is increased more and more due to the continuous improvement of the current lamp bead manufacturing technology and the technology of driving an IC (integrated circuit), and the measurement is carried out by gray scaleThe brightness values of RGB make the measurement time longer. Thus setting the R color low luminance threshold R_TMeasuring the R color brightness value and the R color low brightness threshold value R according to the sequence from small to large in gray scale_TComparing when the measured brightness value of the R color is equal to or greater than the low brightness threshold value R of the R color_TStopping the comparison, measuring the brightness value less than or equal to R color low brightness threshold value R for R color_TThe R color low brightness measurement table is generated. Setting G color low brightness threshold G by the same method_TGenerating a G color low-brightness measuring meter; setting a B color low brightness threshold B_TAnd generating a B color low brightness measuring meter. Adjusting the LED display screen to the R color gray scale of 255, and calling a colorimeter to measure the maximum brightness R of the R color_MMeasuring the maximum brightness G of the G color by the same method_MAnd maximum brightness G of G color_M，

The specific method for setting the low-brightness threshold value is that firstly, a white low-brightness threshold value V in the image data is set_T，V_TThe larger the correction effect, the better, but V_TThe larger the correction time, the more rapidly the white color is to be corrected, and the lower the brightness threshold V is generally_TSetting the maximum brightness R of the R color obtained in the step as 1% -2% of the maximum brightness of the white color_MMaximum brightness G of G color_MMaximum brightness B of color B_MAnd a white low luminance threshold V_TSubstituting formula to calculate R color low brightness threshold value R_T＝V_T*R_M/(R_M+G_M+B_M) G color low luminance threshold G_T＝V_T*G_M/(R_M+G_M+B_M) Low brightness threshold of B color B_T＝V_T*B_M/(R_M+G_M+B_M)。

According to the embodiment of the application, the measurement process is further explained through specific data, the LED box body is lightened, the gray level of the R color is adjusted to be 255, and the maximum brightness R of the R color is measured by calling a colorimeter_M309.1198; adjusting the gray scale of the G color to be 255, and calling a colorimeter to measure the maximum brightness G of the G color_M697.5598; adjusting the gray scale of the B color to be 255, and calling a colorimeter to measure the maximum brightness B of the B color_M＝122.4798。

Setting a white low luminance threshold V_T＝1.0cd/m²Maximum brightness R of R color_M309.1198G color maximum brightness G_M697.5598 maximum brightness B of color B_M122.4798 and a white low luminance threshold V_TSubstituting formula for 1 to calculate R color low brightness threshold value R_T，

R_T＝1.0*309.1198/(309.1198+697.5598+122.4798)≈0.2738。

Measuring R color brightness value by using a colorimeter from gray level 1 to gray level, sequentially increasing the gray levels, and when the R color measurement brightness value is equal to or greater than R color low brightness threshold value R_TWhen the measurement is stopped at 0.2738, an R color low brightness measurement table is generated based on the R color measurement brightness value:

TABLE 1R color low brightness measuring meter

Gray scale	Brightness value	Gray scale	Brightness value	Gray scale	Brightness value	Gray scale	Brightness value
								1	0.0053	14	0.076	27	0.1426	40	0.208
2	0.0106	15	0.081	28	0.1486	41	0.2141
								3	0.0159	16	0.0861	29	0.1527	42	0.22
4	0.0212	17	0.0913	30	0.1567	43	0.2268
								5	0.0263	18	0.0966	31	0.1611	44	0.2335
6	0.0311	19	0.1028	32	0.1657	45	0.2381
								7	0.0363	20	0.1088	33	0.1711	46	0.2429
8	0.0413	21	0.1131	34	0.1766	47	0.248
								9	0.0474	22	0.1173	35	0.1821	48	0.2532
10	0.0534	23	0.122	36	0.1874	49	0.2586
								11	0.06	24	0.1267	37	0.1925	50	0.2639
12	0.0666	25	0.1318	38	0.1975	51	0.2701
								13	0.0713	26	0.1367	39	0.2029	52	0.2763

As a specific implementation mode of the step of calculating the initial brightness, the image data is displayed by using an LED display screen, the initial brightness is different due to different display effects of the LED display screens of different devices, and a worker can freely set the initial white brightness V in the image data according to the display effect of the LED display screen at first_SMaximum brightness R of R color_MMaximum brightness G of G color_MMaximum brightness B of color B_MAnd white initial brightness V_SSubstituting formula to calculate R color initial brightness R_S，R_S＝V_S*R_M/(R_M+G_M+B_M) Calculating the initial brightness G of the G color_S，G_S＝V_S*G_M/(R_M+G_M+B_M) And calculating the initial brightness B of the color B_S，B_S＝V_S*B_M/(R_M+G_M+B_M). The staff can set multiple groups of white initial brightness V_SCorrecting, and comparing the correction result to determine the optimal initial white brightness value V_S。

With reference to this embodiment, the calculation process is further described by specific data, and for this LED box, the brightness of white at a gray scale level of 1 is set as the initial brightness V_SInitial brightness V_S＝0.3cd/m²Maximum brightness R of R color_MMaximum brightness G of G color_MMaximum brightness B of color B_MAnd white initial brightness V_SSubstituting the formula to calculate the initial brightness value of the R color: r_S＝0.3*309.1198/(309.1198+697.5598+122.4798)≈0.0821。

As a specific implementation mode of the step of calculating the initial parameter value, the maximum brightness R of the R color obtained in the step is used_MR color initial luminance R_SSubstituting the gamma value g into a formula to calculate the R color initial parameter value R_P，R_p＝exp(ln(R_S/R_M) (iv)/g); maximum brightness G of G color_MG color initial luminance G_SSubstituting the gamma value G into a formula to calculate the G color initial parameter value G_P，G_p＝exp(ln(G_S/G_M) (iv)/g); maximum brightness B of B color_MB initial brightness of color B_SSubstituting the gamma value g into a formula to calculate the initial parameter value B of the color B_P，B_p＝exp(ln(B_S/B_M) In terms of/g). Wherein the gamma value g can be selected from 2.2 to 2.8.

In combination with the embodiment of the present application, the measurement process is further explained by specific data, the gamma value g is set to 2.8, and the maximum brightness R of the R color is set_M309.1198, R color initial luminance R_SSubstituting 0.0821 and gamma value g 2.8 into formula to calculate R color initial parameter value R_P，R_p＝exp(ln(0.0821/309.1198)/2.8)≈0.052837。

As a specific embodiment of the step of generating the theoretical luminance table, the maximum luminance R of the R color obtained in the above step_MR color initial luminance R_SR color initial parameter value R_PSubstituting the gamma value g into a formula to calculate the theoretical brightness value S at each gray level j of the R color_R(j) Based on the theoretical brightness value S at each gray level j of the R color_R(j) Generating an R color theoretical brightness table; the maximum brightness G of the G color obtained in the step_MG color initial luminance G_SG color initial parameter value G_PSubstituting the gamma value G into a formula to calculate the theoretical brightness value S at each gray level j of the G color_G(j) Based on the theoretical brightness value S at each gray level j of the G color_G(j) Generating a G color theoretical brightness table; the maximum brightness B of the color B obtained in the above step_MB initial brightness of color B_SInitial parameter value B of color B_PSubstituting the gamma value g into a formula to calculate the theoretical brightness value S at each gray level j of the B color_B(j) Based on the theoretical brightness value S at each gray level j of the B color_B(j) Generating a B color theoretical brightness table, wherein j is an integer greater than or equal to 1 and less than or equal to 255, the gamma value g can be selected from 2.2 to 2.8,

S_R(j)＝pow(R_p+(j-1)·(1-R_p)/254，g)·R_M，

S_G(j)＝pow(G_p+(j-1)·(1-G_p)/254，g)·G_M，

S_B(j)＝pow(B_p+(j-1)·(1-B_p)/254，g)·B_M。

in conjunction with the embodiment of the present application, the measurement process is further described by specific data, the gamma value g is set to 2.8, and the maximum brightness R of the R color in the above step is set as R_M309.1198, R color initial luminance R_S0.0821, R color initial parameter value R_pSubstituting 0.052837 and gamma value g 2.8 into formula to calculate S_R(j)＝pow(R_p+(j-1)*(1-R_p)/254,g)*R_MAnd an R color theoretical luminance table with a gamma value of 2.8 is generated.

TABLE 2 theoretical brightness table of R color with gamma value of 2.8

As a specific implementation manner of the step of calculating and correcting the gray scale value, based on the R color theoretical brightness table and the R color measured brightness table obtained in the above steps, the theoretical brightness value of each gray scale in the R color theoretical brightness table is sequentially obtained, the error absolute value between the R color theoretical brightness value and the measured brightness value of each gray scale in the R color measured brightness table is calculated, the gray scale value of the measured brightness value corresponding to the minimum error absolute value is obtained, and the gray scale value is used as the corrected gray scale value of the gray scale of the R color;

based on the G color theoretical brightness table and the G color measurement brightness table obtained in the above steps, sequentially obtaining theoretical brightness values of all gray levels in the G color theoretical brightness table, calculating error absolute values of the G color theoretical brightness values and the measurement brightness values of all gray levels in the G color measurement brightness table, obtaining a gray level value of the measurement brightness value corresponding to the minimum error absolute value, and taking the gray level value as a correction gray level value of the gray level of the G color;

and based on the B color theoretical brightness table and the B color measured brightness table obtained in the step, sequentially obtaining the theoretical brightness value of each gray level in the B color theoretical brightness table, calculating the error absolute value of the B color theoretical brightness value and the measured brightness value of each gray level in the B color measured brightness table, obtaining the gray level value of the measured brightness value corresponding to the minimum error absolute value, and taking the gray level value as the corrected gray level value of the gray level of the B color.

In conjunction with the embodiment of the present application, the measurement process is further described by specific data, and if the theoretical luminance value of R color gray scale level 4 is 0.1406, the measured luminance of gray scale 27 in the R color measured luminance table is 0.1426, and the absolute value of the error between the theoretical luminance value of gray scale level 4 of R color and the theoretical luminance value of gray scale level 0.1406 is the smallest, the corrected gray scale value at R color gray scale level 4 is 27, and the corrected gray scale values of other gray scale levels of R color are calculated in the same manner.

As another specific embodiment of the step of calculating the corrected gray scale value, for the portion of the measured luminance value smaller than the low luminance threshold, the calculation is performed using the specific embodiment of calculating the corrected gray scale value described above. And for the part of which the measured brightness value is greater than the low brightness threshold value, setting key points, acquiring the brightness at the key points, generating a key brightness table, and calculating a correction gray-scale value based on the key brightness table and the theoretical brightness table.

The specific implementation manner of setting the key point of the R color is that the measured brightness value of the R color is larger than the low brightness threshold value R of the R color_TIs divided into N sections, and the node of each section is R color key point N_R(ii) a The specific implementation mode for setting the key point of the G color is that the measured brightness value of the G color is larger than the low brightness threshold value G of the G color_TIs divided into N sections, and the node of each section is G color key point N_G(ii) a The specific implementation mode for setting key points of the color B is to set the color BMeasuring brightness value greater than B color low brightness threshold value B_TIs divided into N sections, and the node of each section is a B color key point N_B(ii) a Wherein N is an integer greater than 0, the larger the value is, the better the correction effect is, and the general value range is 30-50.

In obtaining R color key point N_BThe method before the brightness value comprises that the R color low brightness threshold value R is equal to_TOr greater than and closest to the R color low brightness threshold R_TThe gray scale RSL corresponding to the R color measurement brightness value_TTo maximum R color gray scale SL_MAveragely divided into N sections, and each section of nodes is a key point N_RCalculating a key point N according to the corresponding gray level value_RCorresponding gray scale value RSL_i＝RSL_T+(SL_M-RSL_T) N x i; obtaining G color key point N_GThe method before the brightness value of (A) includes equaling the G color low brightness threshold G_TOr greater than and closest to the G color low brightness threshold G_TG color measurement gray scale GSL corresponding to the brightness value_TTo maximum R color gray scale SL_MAveragely divided into N sections, and each section of nodes is a key point N_GCalculating a key point N according to the corresponding gray level value_GCorresponding gray scale value GSL_i＝GSL_T+(SL_M-GSL_T) N x i; obtaining key point N of color B_BThe method before processing the luminance value comprises that the luminance value is equal to a B color low luminance threshold value B_TOr greater than and closest to the B color low luminance threshold B_TThe gray scale BSL corresponding to the B color measurement brightness value_TTo maximum gray scale SL of color B_MAveragely divided into N sections, and each section of nodes is a key point N_BCalculating a key point N according to the corresponding gray level value_BCorresponding gray scale value BSL_i＝BSL_T+(SL_M-RSL_T) N x i; wherein i is the serial number of the key point, and i is an integer greater than or equal to 1 and less than or equal to N.

The specific implementation mode for generating the R color key lighting table is to call the colorimeter and carry out comparison on the gray scale value RSL_iMeasuring corresponding brightness values to obtain each key point N of the R color_RProcessing brightness value according to each key point N_RBrightness value of and each key point N_RGenerating an R color key lightening table by using the gray scale value; for gray scale value GSL_iCorresponding toMeasuring the brightness value to obtain each key point N of G color_GProcessing brightness value according to each key point N_GBrightness value of and each key point N_GGenerating a G color key lightening table by using the gray scale value; for gray scale value BSL_iMeasuring corresponding brightness values to obtain key points N of B color_BProcessing brightness value according to each key point N_BBrightness value of and each key point N_BThe gray scale value of (B) generates a B color key lighting table.

The specific implementation mode of calculating the corrected gray level value based on the key point brightness table and the theoretical brightness table is that the position of the R color theoretical brightness value at each gray level in the R color key brightness table is obtained, and the gray level values corresponding to two key points adjacent to the theoretical brightness value are substituted into a linear interpolation formula for calculation, so that the corrected gray level value at the gray level corresponding to the R color theoretical brightness value can be obtained; acquiring the position of a theoretical brightness value of the G color at each gray level in a key brightness table of the G color, substituting gray values corresponding to two key points adjacent to the theoretical brightness value into a linear interpolation formula for calculation, and acquiring a corrected gray value at the gray level corresponding to the theoretical brightness value of the G color; and acquiring the position of the theoretical brightness value of the B color at each gray level in a key brightness table of the B color, substituting the gray level values corresponding to two key points adjacent to the theoretical brightness value into a linear interpolation formula for calculation, and acquiring the corrected gray level value at the gray level corresponding to the theoretical brightness value of the B color.

In the embodiment of the present application, the measurement process is further explained by specific data, and the gray scale display capability of the LED display screen in the embodiment of the present application is 16 bits, so that the maximum gray scale values of RGB are 65535, and N is set to 30. The color R is greater than and closest to the low brightness threshold value R of the color R measured by a colorimeter_TThe measured brightness value of 0.2738 is 0.2763, the corresponding gray scale value is 52, the gray scale value 52 is divided into 30 segments, the highest gray scale value 65535 of each segment is the key point N_RThe number of key points is 30.

Greater than and closest to the R color low luminance threshold R_TThe gray scale RSL corresponding to the R color measurement brightness value_TIs a number of the order of 52,maximum R-tone SL_M65535, assume that i is 1 to 30 of a certain key point N_RThe gray scale value RSL at i_i52+ (65535-52)/30 × i, and calculating the key point N in turn_RAnd calling a colorimeter to measure the brightness value corresponding to each gray value to generate a key lighting table of the R color.

TABLE 3 key lightening Table for R color

Number i	Gray scale	Brightness value	Number i	Gray scale	Brightness value	Number i	Gray scale	Brightness value
									0	52	0.2763
1	2234	11.6018	11	24054	118.1198	21	45874	223.7998
									2	4416	22.4018	12	26236	128.1498	22	48056	233.1298
3	6598	33.0418	13	28418	139.0898	23	50238	243.5098
									4	8780	43.6968	14	30600	149.9898	24	52420	253.6198
5	10962	54.3278	15	32782	159.8898	25	54602	263.9498
									6	13144	64.9458	16	34964	171.0298	26	56784	274.8898
7	15326	75.5378	17	37146	181.4198	27	58966	286.2098
									8	17508	86.1328	18	39328	191.0598	28	61148	295.1698
9	19690	96.6498	19	41510	202.2998	29	63330	306.6198
									10	21872	107.3498	20	43692	212.5198	30	65535	309.1198

Calculating an R color correction gray scale value based on the R color key point brightness table and the R color theoretical brightness table, wherein if the R color gray scale is 3.3301 with the theoretical brightness value of 40, the R color correction gray scale value is positioned between the key point 0 and the key point 1, the gray scale value of the key point 0 is 52, and the measured brightness of the key point 0 is 0.2763; the gray scale value of the key point 1 is 2234, the measured brightness of the key point 1 is 11.6018, and the corrected gray scale value at the R color gray scale level 40 is (2234-52)/(11.6018-0.2763) × (3.3301-0.2763) +52 ≈ 640, and the corrected gray scale values of the other R color gray scales are calculated in the same way.

And integrating the corrected gray-scale values obtained by the two implementation modes to obtain the corrected gray-scale values of the RGB three colors.

TABLE 4 corrected grayscale values of RGB three colors

Based on the method, the embodiment of the application also discloses a three-color gamma correction system for the LED display screen, which comprises the following modules:

A module for calculating initial brightness connected with the brightness measuring module and used for receiving the maximum brightness R of the R color_MMaximum brightness G of G color_MAnd maximum brightness B of B color_MAnd setting the initial white brightness V in the image data_SCalculating the initial brightness R of the R color_SG color initial luminance G_SAnd initial brightness B of color B_SWherein, in the step (A),

R_S＝V_S·R_M/(R_M+G_M+B_M)，

G_S＝V_S·G_M/(R_M+G_M+B_M)，

B_S＝V_S·B_M/(R_M+G_M+B_M)；

an initial parameter value calculating module connected with the brightness measuring module and the initial brightness calculating module for receiving the maximum brightness R of the R color_MMaximum brightness G of G color_MAnd maximum brightness B of B color_MAnd receiving the R color initial brightness R_SG color initial luminance G_SAnd initial brightness B of color B_SAnd calculating the R color numberStarting parameter value R_PG color initial parameter value G_PAnd initial parameter value B of color B_PWherein R is_p＝exp(ln(R_S/R_M) G) is a gamma value,

G_p＝exp(ln(G_S/G_M) G) is a gamma value,

B_p＝exp(ln(B_S/B_M) G) g is a gamma value;

S_R(j)＝pow(R_p+(j-1)·(1-R_p)/254，g)·R_Mand g is a gamma value,

S_G(j)＝pow(G_p+(j-1)·(1-G_p)/254，g)·G_Mand g is a gamma value,

S_B(j)＝pow(B_p+(j-1)·(1-B_p)/254，g)·B_Mg is a gamma value;

Based on the method, the embodiment of the application further discloses a computer device, which comprises a memory and a processor, wherein the memory stores a computer program which can be loaded by the processor and executes any step of the RGB three-color gamma correction method of the LED display screen.

Based on the above method, the embodiment of the present application further discloses a computer readable storage medium storing a computer program capable of being loaded and executing any step of the RGB three-color gamma correction method for the LED display screen.

Claims

1. An RGB (red, green and blue) three-color gamma correction method for an LED display screen is characterized by comprising the following steps:

R_S=V_S·R_M/(R_M+G_M+B_M)，

G_S=V_S·G_M/(R_M+G_M+B_M)，

B_S=V_S·B_M/(R_M+G_M+B_M)；

R_p=exp(ln(R_S/R_M) G) is a gamma value,

G_p=exp(ln(G_S/G_M) G) is a gamma value,

B_p=exp(ln(B_S/B_M) G) g is a gamma value;

S_R(j)=pow(R_p+(j-1)·(1-R_p)/254，g)·R_Mand g is a gamma value,

S_G(j)=pow(G_p+(j-1)·(1-G_p)/254，g)·G_Mand g is a gamma value,

S_B(j)=pow(B_p+(j-1)·(1-B_p)/254，g)·B_Mg is a gamma value;

2. The RGB tristimulus gamma correction method for LED display screen of claim 1, wherein the method before the step of calculating the correction gray scale value further comprises: setting a R color low brightness threshold R_TMeasuring the R color brightness value of each gray scale and the R color low brightness threshold value R_TComparing if the measured brightness value of the R color is less than or equal to the low brightness threshold value R of the R color_TBased on the theoretical luminance values of R colors and RCalculating an R color correction gray scale value by using the color measurement brightness value; if the measured brightness value of the R color is larger than the low brightness threshold value R of the R color_TThen the measured brightness value of the R color is larger than the low brightness threshold value R of the R color_TIs divided into N sections, and the node of each section is set as a key point N_RObtaining each key point N_RGenerating an R color key point brightness table, and calculating an R color correction gray scale value based on the R color key point brightness table and the R color theoretical brightness table, wherein N is an integer greater than 0;

3. The RGB three-color gamma correction method for LED display screen as claimed in claim 2, wherein the method comprisesThe method for setting the low brightness threshold is to set a white low brightness threshold V in the image data_TCalculating R color low brightness threshold value R_TG color low luminance threshold value G_TAnd a low luminance threshold B of the B color_TWherein, in the step (A),

R_T=V_T*R_M/(R_M+G_M+B_M)，

G_T=V_T*G_M/(R_M+G_M+B_M)，

B_T=V_T*B_M/(R_M+G_M+B_M)。

4. the RGB three-color gamma correction method of LED display screen of claim 2, wherein said measuring the brightness values of R color gray scales based on the image data to generate the R color measurement brightness table comprises sequentially comparing the R color measurement brightness values of the gray scales with a R color low brightness threshold R in descending order of magnitude_TComparing if the measured brightness value of R color is greater than the low brightness threshold value R of R color_TThe comparison is stopped, if the measured brightness value of the R color is less than or equal to the low brightness threshold value R of the R color_TGenerating an R color low brightness measuring table according to the R color measuring brightness value;

the specific method for measuring the brightness value of each gray scale of the G color based on the image data and generating the G color measurement brightness table comprises the steps of sequentially connecting the G color measurement brightness value of each gray scale with a G color low brightness threshold value G from small to large_TComparing if the measured brightness value of the G color is greater than the low brightness threshold value G of the G color_TThe comparison is stopped, if the measured brightness value of the G color is less than or equal to the low brightness threshold value G of the G color_TGenerating a G color low brightness measuring meter according to the G color measuring brightness value;

the specific method for measuring the brightness values of all gray scales of the B color based on the image data and generating the B color measurement brightness table comprises the steps of sequentially connecting the B color measurement brightness values of all gray scales with a B color low brightness threshold B from small to large_TComparing if the measured brightness value of B color is greater than the low brightness threshold value B of B color_TThe comparison is stopped, if color B is presentMeasuring a brightness value less than or equal to the B color low brightness threshold B_TAnd generating a B color low brightness measuring table according to the B color measuring brightness value.

5. The RGB three-color gamma correction method for LED display screen as claimed in claim 2, wherein each key point N is obtained_RThe method before luminance value of (A) further comprises equaling the R color low luminance threshold R_TOr greater than and closest to the R color low brightness threshold R_TThe gray scale RSL corresponding to the R color measurement brightness value_TTo maximum R color gray scale SL_MAveragely divided into N sections, and each section of nodes is a key point N_RCalculating a key point N according to the corresponding gray level value_RCorresponding gray scale value RSL_i=RSL_T+（SL_M-RSL_T) The key points are arranged in the same row, wherein i is the serial number of the key points, and i is an integer which is more than or equal to 1 and less than or equal to N;

obtaining each key point N_GThe method before luminance value of (A) further comprises equaling the G color low luminance threshold G_TOr greater than and closest to the G color low brightness threshold G_TG color measurement gray scale GSL corresponding to the brightness value_TTo maximum R color gray scale SL_MAveragely divided into N sections, and each section of nodes is a key point N_GCalculating a key point N according to the corresponding gray level value_GCorresponding gray scale value GSL_i=GSL_T+（SL_M-GSL_T) The key points are arranged in the same row, wherein i is the serial number of the key points, and i is an integer which is more than or equal to 1 and less than or equal to N;

obtaining each key point N_BThe method before processing the luminance value further comprises equaling a B color low luminance threshold B_TOr greater than and closest to the B color low luminance threshold B_TThe gray scale BSL corresponding to the B color measurement brightness value_TTo maximum gray scale SL of color B_MAveragely divided into N sections, and each section of nodes is a key point N_BCalculating a key point N according to the corresponding gray level value_BCorresponding gray scale value BSL_i=BSL_T+（SL_M-RSL_T) and/N x i, wherein i is the serial number of the key point, and i is an integer which is greater than or equal to 1 and less than or equal to N.

6. The RGB three-color gamma correction method of LED display screen as claimed in claim 5, wherein the R color key-lighting table is generated based on each key point N_RCorresponding gray scale value RSL_iMeasure each key point N_RThe brightness value of (1) is determined according to each key point N_RBrightness value of and each key point N_RGenerating an R color key lightening table by using the gray scale value;

7. The RGB three-color gamma correction method of LED display screen of claim 6, wherein the specific method for calculating R color correction gray scale value based on R color key point brightness table and R color theoretical brightness table is to obtain the position of R color theoretical brightness value at each gray level in R color key brightness table, and calculate R color correction gray scale value by linear interpolation method;

8. An RGB three-color gamma correction system for an LED display screen, comprising:

R_S=V_S·R_M/(R_M+G_M+B_M)，

G_S=V_S·G_M/(R_M+G_M+B_M)，

B_S=V_S·B_M/(R_M+G_M+B_M)；

an initial parameter value calculating module connected with the brightness measuring module and the initial brightness calculating module for receiving the maximum brightness R of the R color_MMaximum brightness G of G color_MAnd maximum brightness B of B color_MAnd receiving the R color initial brightness R_SG color initial luminance G_SAnd initial brightness B of color B_SAnd calculating the R color initial parameter value R_PG color initial parameter value G_PAnd initial parameter value B of color B_PWherein, in the step (A),

R_p=exp(ln(R_S/R_M) G) is a gamma value,

G_p=exp(ln(G_S/G_M) G) is a gamma value,

B_p=exp(ln(B_S/B_M) G) g is a gamma value;

S_R(j)=pow(R_p+(j-1)·(1-R_p)/254，g)·R_Mand g is a gamma value,

S_G(j)=pow(G_p+(j-1)·(1-G_p)/254，g)·G_Mand g is a gamma value,

S_B(j)=pow(B_p+(j-1)·(1-B_p)/254，g)·B_Mg is a gamma value;

9. A computer device comprising a memory and a processor, the memory having stored thereon a computer program that can be loaded by the processor and that executes the method according to any of claims 1 to 7.

10. A computer-readable storage medium, characterized in that a computer program is stored which can be loaded and which executes the method according to any one of claims 1 to 7.