Method, system, product, device and storage medium for correcting low-gray color distortion

Abstract

The application discloses a correction method, system, product, equipment and storage medium for low-gray color distortion, belongs to the technical field of LED display screen correction, and solves the technical problem of color distortion existing in low-gray display of an LED display image in the prior art. Step 1: an RGB color system of an LED display screen is acquired, the RGB color system of the LED display screen is converted into an xyY color space, and a deviation database is obtained; step 2: based on the deviation database, a compensation coefficient lookup table is constructed; and step 3: based on the compensation coefficient lookup table, color dithering is performed on a real-time image displayed by the LED display screen, color difference correction is performed on the real-time image displayed by the LED display screen after color dithering, and an LED display image after color difference correction is obtained. The application is used for improving the color of the LED display screen and restoring the precision of the LED display screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED display screen correction, in particular to a low-gray color distortion correction method, system, product, equipment and storage medium. BACKGROUND

[0002] LED (Light Emitting Diode) display is a common display technology that transmits the picture to be played to the LED display screen for display, realizing more rich and vivid display effect and giving strong visual impact. At present, it is widely used in scenes such as science and technology exhibition, advertisement propaganda and creative display, and can play video, text and image programs at will, and play various information in real time, synchronization and clear information transmission mode. However, the current LED display screen is prone to chroma deviation and non-linear response of brightness in low gray state, resulting in color distortion of dark field picture and incoherent gray scale transition.

[0003] The current color correction of LED display screen is usually global correction. This method has the advantages of convenience and speed, but the disadvantages are obvious. Traditional correction methods mostly rely on global gamma curve compensation, and it is difficult to adapt to the differences in different driving chips and lamp bead aging. Only one gamma (gamma) is used to simulate the human visual characteristic curve, and the low gray color distortion problem increases significantly with the increase of contrast, and it is difficult to accurately grasp the color correction of each gray level. In addition, this method cannot protect some human eye memory colors, which will cause the phenomenon of red skin color. At the same time, the LED display screen using single gamma correction has obvious technical limitations, mainly reflected in the insufficient adaptability of photoelectric characteristics and visual perception matching degree. Due to the quantum efficiency difference of R / G / B (red / green / blue) three-channel LED chips and the non-linear response characteristics of driving IC (integrated circuit), such as the sharp drop of red light efficiency in low current area, fixed gamma curve will cause serious color distortion and non-linear distortion of brightness in low gray interval, which destroys the gray scale continuity. At the same time, according to Weber-Fechner (Weber-Fechner) law, the sensitivity of human eye to low brightness area and single exponential characteristics do not match, causing the loss of visual distinguishability of part of gray scale, which significantly affects the HDR (High Dynamic Range) content restoration ability. In addition, the influence of LED wavelength batch drift and environmental light dynamic change is not considered, and single correction will amplify the color temperature deviation between modules, affecting the user's viewing experience of LED display screen.

[0004] In the prior art, Chinese patent document CN114067731A discloses a "method, device, and brightness correction system for low-grayscale correction of LED displays." The method sequentially obtains a preset grayscale setting value n and LED display brightness data for each grayscale below the grayscale setting value n. In the LED display brightness data, each light point on the LED display corresponds to n display brightness values. From the n display brightness values ​​corresponding to the light point to be corrected, the method selects grayscale value i, the display brightness value Pi corresponding to grayscale value i+1, and the display brightness value Pi+1. A target brightness value is set using the display brightness value Pi and the display brightness value Pi+1. The method also calculates the brightness compensation value b for the light point to be corrected using a preset brightness compensation value calculation strategy and the target brightness value, display brightness value Pi+1, display brightness value Pi, grayscale setting value n, and grayscale value i. However, this technical solution only corrects low-grayscale brightness and does not consider the impact of LED wavelength batch drift and dynamic changes in ambient light. This single correction can amplify color temperature deviations between modules, affecting the user's viewing experience of the LED screen.

[0005] In summary, the prior art has the technical problem of color distortion in low grayscale display of LED display images. Summary of the Invention

[0006] The present invention solves the technical problem of color distortion in low grayscale display of LED display images in the prior art.

[0007] The method for correcting low-grayscale color distortion of the present invention comprises the following steps:

[0008] Step 1: Obtain the RGB color system of the LED display screen, convert the RGB color system of the LED display screen into the xyY color space, and obtain a deviation database;

[0009] Step 2: construct a compensation coefficient lookup table based on the deviation database;

[0010] Step 3: Based on the compensation coefficient lookup table, color dithering is performed on the real-time image displayed on the LED display screen, and color difference correction is performed on the real-time image displayed on the LED display screen after color dithering to obtain an LED display image after color difference correction.

[0011] Furthermore, in the embodiment of the present invention, the RGB color system of the LED display screen is converted into the xyY color space in step 1 to obtain the deviation database, specifically:

[0012] Get the color gamut conversion parameters when the RGB color system of the LED display is converted to the xyY color space, and get the actual color of the LED display after the color gamut conversion. The color deviation between the actual color of the LED display after the color gamut conversion and the theoretical color after the color gamut conversion of the LED display is as follows:

[0013] ;

[0014] ;

[0015] ;

[0016] in, In xyY space Parameter deviation data value, is the truncation function, In xyY space Parameter deviation data value, To control the system accuracy, In xyY space Parameter deviation data value, 、 and is the brightness value of the three primary colors after gamma correction, and is the xyY color space coordinate of red, and is the xyY color space coordinate of green, and is the xyY color space coordinate of blue, 、 、 、 、 、 、 、 and are different color gamut conversion parameters, is the vertical coordinate in the RGB color system before conversion, is the vertical coordinate in the converted xyY color space, For the The quantized value of the red brightness correction parameter of each pixel, and Different The quantized value of the green brightness correction parameter of each pixel, and Different Quantized value of the blue brightness correction parameter of each pixel;

[0017] The color deviation between the actual color after the LED display screen color gamut conversion and the theoretical color after the LED display screen color gamut conversion is used as the deviation database.

[0018] Furthermore, in an embodiment of the present invention, the compensation coefficient lookup table in step 2 includes brightness compensation coefficients and correction parameters.

[0019] Furthermore, in the embodiment of the present invention, the color dithering of the real-time image displayed on the LED display screen in step 3 is specifically performed as follows:

[0020] The real-time image displayed on the LED display is evenly divided into multiple pixel windows, and the color deviations in the multiple pixel windows are diffused to adjacent pixel windows to obtain the real-time image displayed on the LED display after color dithering.

[0021] The low gray color distortion correction system of the present invention includes the following modules:

[0022] The conversion module obtains the RGB color system of the LED display screen, converts the RGB color system of the LED display screen into the xyY color space, and obtains a deviation database;

[0023] A construction module constructs a compensation coefficient lookup table based on the deviation database;

[0024] The correction module performs color dithering on the real-time image displayed on the LED display screen based on the compensation coefficient lookup table, and performs color difference correction on the real-time image displayed on the LED display screen after color dithering to obtain an LED display image after color difference correction.

[0025] A computer program product according to the present invention includes a computer program or an instruction, and is characterized in that when the computer program or the instruction is executed by a processor, any of the above-mentioned methods for correcting low-gray color distortion is implemented.

[0026] An electronic device according to the present invention comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0027] Memory for storing computer programs;

[0028] The processor is configured to implement any of the above-mentioned methods for correcting low-grayscale color distortion when executing a program stored in the memory.

[0029] A computer-readable storage medium according to the present invention is characterized in that a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, any of the above-mentioned methods for correcting low-gray color distortion is implemented.

[0030] A display screen according to the present invention is characterized in that the display screen adopts any of the above-mentioned low-gray color distortion correction methods to achieve correction of low-gray color distortion.

[0031] The present invention solves the technical problem of color distortion in low grayscale display of LED display images in the prior art. Specific beneficial effects include:

[0032] 1. The method for correcting low-gray color distortion proposed in the present invention models the LED display screen to obtain the color information of all pixels on the screen, performs theoretical calculations on the low-gray color information of the LED display screen, and uses the color deviation characteristics of each grayscale obtained by theoretical calculations to construct a compensation coefficient lookup table. The real-time image displayed by the LED display screen is color-dithered, and complementary colors are assigned in the spatial domain. The real-time image displayed by the color-dithered LED display screen is then color-corrected. Intelligent pixel-level control is achieved through color dithering, which improves the color of the LED display screen and restores the accuracy of the LED display screen, thereby improving the low-gray color cast problem of the LED display screen, significantly improving the accuracy of low-grayscale color restoration, and effectively correcting the color distortion phenomenon existing in the low-grayscale display of LED display images.

[0033] 2. The low-gray color distortion correction method proposed in the present invention converts the inherent deviation caused by the control system accuracy limitation into a system error that can be compensated by spatial modulation, diffuses the deviation of each pixel into a 2*2 pixel window, and realizes color dithering through an improved error diffusion algorithm. The overall display accuracy is improved through the synergy between pixels. The improved error diffusion algorithm adopts configurable pixel window size and diffusion coefficient, and can optimize parameters according to the characteristics of different display modules. While maintaining the details of the original image, it effectively improves the color expression of low grayscale areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0035] Figure 1 This is a schematic diagram of color mixing in the LED display screen according to the first embodiment;

[0036] Figure 2 This is a schematic diagram of the color distortion phenomenon caused by the control system accuracy problem described in the first embodiment;

[0037] Figure 3 2 is a schematic diagram of the color dithering window described in the fourth embodiment. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe various embodiments of the present invention in conjunction with the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0039] Implementation 1. The method for correcting low-gray color distortion according to this implementation comprises the following steps:

[0040] Step 1: Obtain the RGB color system of the LED display screen, convert the RGB color system of the LED display screen into the xyY color space, and obtain a deviation database;

[0041] Step 2: construct a compensation coefficient lookup table based on the deviation database;

[0042] Step 3: Based on the compensation coefficient lookup table, color dithering is performed on the real-time image displayed on the LED display screen, and color difference correction is performed on the real-time image displayed on the LED display screen after color dithering to obtain an LED display image after color difference correction.

[0043] The existing technology has the technical problem of color distortion in low grayscale display of LED display images.

[0044] To address the aforementioned technical issues, this embodiment provides a method for correcting low-grayscale color distortion. This method collects the RGB color system of an LED display image at low grayscale, combines it with the CIE (International Commission on Illumination) chromaticity coordinate theoretical model, constructs a nonlinear color gamut mapping relationship for each pixel, generates a compensation coefficient matrix, and applies this compensation coefficient to the control system to compensate for the low-grayscale color distortion problem of the LED display image. Specifically, the method includes the following steps:

[0045] Step 1: geometrically model the sub-pixels of the LED display screen, and obtain the color information of each grayscale pixel of the LED display screen by dividing the R / G / B channels. Convert the RGB color system into the xyY color space. The color of each pixel is expressed as ( ).

[0046] The color mixing principle of LED display screen complies with the Grassmann color matching principle. The color mixing method in LED display screen is as follows: Figure 1 shown.

[0047] First, based on the geometric modeling data of the LED display, the spatial position information of each sub-pixel is accurately obtained; then the RGB color of each sub-pixel is calculated, and then the RGB color system is converted to the xyY color space through the established color space conversion matrix. The conversion formula is:

[0048] ;

[0049] ;

[0050] ;

[0051] ;

[0052] in, is the transformation matrix, is the color coordinate in the converted xyY color space, is the input RGB color coordinate, and are the x and y coordinates in the xyY color space, respectively. is the brightness coordinate.

[0053] However, in actual applications, due to the accuracy problem of the control system, low-gray colors cannot be mixed, and low-gray color distortion occurs, such as Figure 2 As shown, therefore, by calculating the color deviation of each gray level in the low gray part due to the accuracy of the control system, a basis is provided for the subsequent color dithering.

[0054] Step 2: construct a compensation coefficient lookup table based on the deviation database;

[0055] Step 3: Based on the compensation coefficient lookup table, color dithering is performed on the real-time image displayed on the LED display screen, and color difference correction is performed on the real-time image displayed on the LED display screen after color dithering to obtain an LED display image after color difference correction;

[0056] Combining the human visual perception model, chromatic aberration correction is performed in the xyY color space to ensure that the color transition between adjacent pixels is natural and smooth after spatial dithering, which conforms to the spatial integration characteristics of the visual system.

[0057] Therefore, this embodiment uses the color deviation characteristics of each grayscale obtained by theoretical calculation to select a pixel window in the xyY color space of the real-time image displayed on the LED display screen for adaptive spatial color dithering processing, that is, the deviation of each pixel is diffused to the adjacent pixel window, and complementary colors are distributed in the spatial domain to achieve color dithering in the xyY color space. Through intelligent pixel-level regulation, the color of the LED display screen is improved and the accuracy of the LED display screen is restored, the overall color accuracy of the LED display screen is improved, the color difference is reduced, and the accuracy of low-grayscale color restoration is improved, solving the technical problem of color distortion in low-grayscale display of LED display images in the existing technology.

[0058] Implementation 2. This implementation is a further limitation of the low gray color distortion correction method described in Implementation 1. In step 1, the RGB color system of the LED display is converted into an xyY color space to obtain a deviation database, specifically:

[0059] Get the color gamut conversion parameters when the RGB color system of the LED display is converted to the xyY color space, and get the actual color of the LED display after the color gamut conversion. The color deviation between the actual color of the LED display after the color gamut conversion and the theoretical color after the color gamut conversion of the LED display is as follows:

[0060] ;

[0061] ;

[0062] ;

[0063] in, is the x parameter deviation data value in the xyY space, is the truncation function, is the Y parameter deviation data value in the xyY space, To control the system accuracy, is the y parameter deviation data value in the xyY space, 、 、 is the brightness value of the three primary colors after gamma correction, 、 is the xyY color space coordinate of red, 、 is the xyY color space coordinate of green, 、 is the xyY color space coordinate of blue, 、 、 、 、 、 、 、 、 is the color gamut conversion parameter, is the vertical coordinate in the RGB color system before conversion, is the vertical coordinate in the converted xyY color space, For the The quantized value of the red brightness correction parameter of each pixel, and Different The quantized value of the green brightness correction parameter of each pixel, and Different Quantized value of the blue brightness correction parameter of each pixel;

[0064] The color deviation between the actual color after the LED display screen color gamut conversion and the theoretical color after the LED display screen color gamut conversion is used as the deviation database.

[0065] In actual display, the LED display is composed of pixels. When the LED display performs color gamut conversion, the color difference function model of each pixel is fixed. One set of color gamut conversion parameters includes nine color gamut conversion parameters of the pixel, with the first Taking the red conversion parameter of a pixel as an example, it can be expressed as 、 、 、 、 、 、 、 and The color gamut conversion matrix of each pixel is related to the above nine color gamut conversion parameters. The value of the color gamut conversion parameter depends on the base color original color gamut RGB color system and the given target conversion color gamut xyY color space. These nine color gamut conversion parameters are discrete, and the value range of all color gamut conversion parameters is (0, 1]. When performing color gamut conversion calculations, since the control system is discrete and not continuous, the calculated data must be quantized. The specific quantization accuracy depends on the control accuracy of the display device. The correction parameters of each pixel can be expressed as:

[0066] ;

[0067] in, is the calibration parameter, 、 、 、 、 、 、 、 、 It is the color gamut conversion parameter.

[0068] The correction parameters of each pixel are calculated based on the color gamut conversion relationship, and the actual color of each pixel after color gamut conversion can be obtained as follows:

[0069] ;

[0070] ;

[0071] ;

[0072] ;

[0073] in, For the pixels, is the brightness value after conversion, ‌、 ‌、 The horizontal, vertical, and depth coordinates in the converted xyY color space, is the truncation function, which is used to simulate the truncation error generated by the control system. 、 、 is the brightness value of the three primary colors after gamma correction, 、 、 is the xyY color space coordinate of red, 、 、 is the xyY color space coordinate of green, 、 、 The xyY color coordinate of blue.

[0074] Under the influence of quantization error, there is a deviation between the actual color after the LED display color gamut conversion and the theoretical color after the LED display color gamut conversion. The expression of the color deviation between the two is:

[0075] ;

[0076] ;

[0077] in, In xyY space Parameter deviation data value, In xyY space Parameter deviation data value.

[0078] and The larger the value, the more obvious the quantization error is, which will cause the color uniformity of the LED display to fail to meet the viewing standard after the color gamut conversion. Therefore, in order to improve the viewing effect of the color of the LED display after conversion, the deviation value between the two must be reduced. Combining the above formula, we can get:

[0079] ;

[0080] ;

[0081] in, In xyY space Parameter deviation data value, For the control system accuracy.

[0082] Embodiment three. The embodiment is a further limitation of the correction method for low gray color distortion described in embodiment one, wherein the compensation coefficient lookup table in step 2 includes a brightness compensation coefficient and a correction parameter.

[0083] Based on the PWM (pulse width modulation) quantization model and the deviation database established in step 1 for the driving non-linear characteristics, a LUT (compensation coefficient lookup table) containing compensation parameters for each gray level of the three channels is constructed. By point-by-point acquisition of the pixel information of the LED display screen, the full-screen brightness coefficient is obtained, the concentration trend of the data set is determined, and the compensation parameter of each pixel point is calculated to obtain the brightness compensation coefficient. The LUT not only contains the brightness compensation coefficient, but also contains the correction parameter.

[0084] The PWM quantization model first discretizes the continuous-time analog signal based on the Nyquist sampling theorem to obtain instantaneous amplitude samples. Then, through a uniform or non-uniform quantizer, the amplitude value of each sample is mapped to a discrete level with limited precision, i.e., the amplitude value is assigned an integer multiple of the quantization step. The quantized amplitude value is converted into a pulse sequence with a corresponding duty cycle, and the pulse width is linearly mapped to the quantization level. This is usually achieved by a counter comparison mechanism. The final output PWM wave is reconstructed into a quantized analog signal through a low-pass filter, and the quantization error is manifested as a discrete deviation in the time domain.

[0085] Embodiment four. The embodiment is a further limitation of the correction method for low gray color distortion described in embodiment one, wherein the step 3 of performing color dithering on the real-time image displayed by the LED display screen is specifically:

[0086] The real-time image displayed by the LED display screen is evenly divided into multiple pixel windows, and the deviation of each pixel in the deviation database is diffused to the adjacent pixel windows to obtain the real-time image displayed by the LED display screen after color dithering.

[0087] As shown in Figure 3 In the real-time image processing link, the control system performs pixel-level analysis on the input signal. For each 2*2 pixel window, an improved error diffusion algorithm is used for dynamic adjustment. The quantization error of the target pixel is intelligently distributed to the adjacent pixel windows through complementary pixel brightness distribution in the spatial domain. The improved error diffusion algorithm is a prior art.

[0088] Embodiment five. The correction system for low gray color distortion described in the embodiment includes the following modules:

[0089] A conversion module is configured to convert the RGB color system of the LED display screen into an xyY color space to obtain a deviation database.

[0090] A construction module constructs a compensation coefficient lookup table based on the deviation database;

[0091] The correction module performs color dithering on the real-time image displayed on the LED display screen based on the compensation coefficient lookup table, and performs color difference correction on the real-time image displayed on the LED display screen after color dithering to obtain an LED display image after color difference correction.

[0092] Embodiment 6. A computer program product described in this embodiment includes a computer program or instructions, which, when executed by a processor, implements the method for correcting low-gray color distortion described in any one of Embodiments 1 to 4.

[0093] Embodiment 7. An electronic device described in this embodiment includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0094] Memory for storing computer programs;

[0095] The processor is configured to implement the method for correcting low-gray color distortion described in any one of embodiments one to four when executing the program stored in the memory.

[0096] Embodiment 8. The computer-readable storage medium described in this embodiment stores a computer program, and when the computer program is executed by a processor, the method for correcting low-gray color distortion described in any one of Embodiments 1 to 4 is implemented.

[0097] Embodiment 9. A display screen described in this embodiment adopts the low-gray color distortion correction method described in any one of Embodiments 1 to 4 to achieve correction of low-gray color distortion.

[0098] The above is a detailed introduction to the low-gray color distortion correction method, system, product, device and storage medium proposed in the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for correcting low gray color distortion, characterized in that: The following steps are involved: Step 1: Obtain the RGB color system of the LED display screen, convert the RGB color system of the LED display screen into the xyY color space, and obtain a deviation database; In step 1, the RGB color system of the LED display is converted into the xyY color space to obtain a deviation database, specifically: Get the color gamut conversion parameters when the RGB color system of the LED display is converted to the xyY color space, and get the actual color of the LED display after the color gamut conversion. The color deviation between the actual color of the LED display after the color gamut conversion and the theoretical color after the color gamut conversion of the LED display is specifically: ； ； ； in, In xyY space Parameter deviation data value, is the truncation function, In xyY space Parameter deviation data value, To control the system accuracy, In xyY space Parameter deviation data value, 、 and is the brightness value of the three primary colors after gamma correction, and is the xyY color space coordinate of red, and is the xyY color space coordinate of green, and is the xyY color space coordinate of blue, 、 、 、 、 、 、 、 and are different color gamut conversion parameters, is the vertical coordinate in the RGB color system before conversion, is the vertical coordinate in the converted xyY color space, For the The quantized value of the red brightness correction parameter of each pixel, and Different The quantized value of the green brightness correction parameter of each pixel, and Different Quantized value of the blue brightness correction parameter of each pixel; The color deviation between the actual color after the LED display screen color gamut conversion and the theoretical color after the LED display screen color gamut conversion is used as a deviation database; Step 2: construct a compensation coefficient lookup table based on the deviation database; Step 3: Based on the compensation coefficient lookup table, color dithering is performed on the real-time image displayed on the LED display screen, and color difference correction is performed on the real-time image displayed on the LED display screen after color dithering to obtain an LED display image after color difference correction.

2. The method for correcting low gray color distortion according to claim 1, wherein: The compensation coefficient lookup table in step 2 includes brightness compensation coefficients and correction parameters.

3. The method for correcting low gray color distortion according to claim 1, wherein: The color dithering of the real-time image displayed on the LED display screen in step 3 is specifically performed as follows: The real-time image displayed on the LED display is evenly divided into multiple pixel windows, and the color deviations in the multiple pixel windows are diffused to adjacent pixel windows to obtain the real-time image displayed on the LED display after color dithering.

4. A system for correcting low-grayscale color distortion, the system being constructed based on the method for correcting low-grayscale color distortion according to claim 1, characterized in that: Includes the following modules: The conversion module obtains the RGB color system of the LED display screen, converts the RGB color system of the LED display screen into the xyY color space, and obtains a deviation database; The conversion module converts the RGB color system of the LED display screen into the xyY color space to obtain a deviation database, specifically: Get the color gamut conversion parameters when the RGB color system of the LED display is converted to the xyY color space, and get the actual color of the LED display after the color gamut conversion. The color deviation between the actual color of the LED display after the color gamut conversion and the theoretical color after the color gamut conversion of the LED display is specifically: ； ； ； in, In xyY space Parameter deviation data value, is the truncation function, In xyY space Parameter deviation data value, To control the system accuracy, In xyY space Parameter deviation data value, 、 and is the brightness value of the three primary colors after gamma correction, and is the xyY color space coordinate of red, and is the xyY color space coordinate of green, and is the xyY color space coordinate of blue, 、 、 、 、 、 、 、 and are different color gamut conversion parameters, is the vertical coordinate in the RGB color system before conversion, is the vertical coordinate in the converted xyY color space, For the The quantized value of the red brightness correction parameter of each pixel, and Different The quantized value of the green brightness correction parameter of each pixel, and Different Quantized value of the blue brightness correction parameter of each pixel; The color deviation between the actual color after the LED display screen color gamut conversion and the theoretical color after the LED display screen color gamut conversion is used as a deviation database; A construction module constructs a compensation coefficient lookup table based on the deviation database; The correction module performs color dithering on the real-time image displayed on the LED display screen based on the compensation coefficient lookup table, and performs color difference correction on the real-time image displayed on the LED display screen after color dithering to obtain an LED display image after color difference correction.

5. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method for correcting low-gray color distortion according to any one of claims 1 to 3 is implemented.

6. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; Memory for storing computer programs; The processor is configured to implement the method for correcting low-gray color distortion according to any one of claims 1 to 3 when executing a program stored in the memory.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for correcting low-gray color distortion according to any one of claims 1 to 3 is implemented.

8. A display screen, characterized in that: The display screen adopts the low-gray color distortion correction method described in any one of claims 1 to 3 to achieve correction of low-gray color distortion.

Images