Method and system for measuring gamma characteristic of LED screen

Abstract

The invention belongs to the field of LED display processing, particularly relates to a method and a system for measuring gamma characteristics of an LED screen, and aims to solve the problems of low measurement speed, high price of measurement equipment, long measurement time and high environmental requirements of the current method. The method comprises the following steps: grouping m to-be-measured level values from small to large; the to-be-tested level values of each group are displayed on a to-be-tested screen; during display, position rotation is carried out, and photographing calculation is carried out to obtain a measurement brightness value of each level value to be measured in each rotation; dividing each measured brightness value by the measured brightness value of the reference level value to obtain a reference brightness value; dividing the a reference brightness value by the (a + 1) reference brightness value to obtain a reference brightness value ratio; averaging the ratios of the reference brightness values to obtain a final ratio; and based on all the final ratios, splicing the m to-be-measured level values to obtain a measurement result. The error and the cost are reduced, and the measurement result is accurate and reliable.

Description

Background Art

[0002] The Gamma characteristic of an LED screen describes the nonlinear relationship between the screen's output brightness and the input electrical signal. In electronic display technology, the Gamma value reflects the degree of this nonlinear conversion.

[0003] The human eye is not linearly sensitive to changes in brightness, but tends to perceive greater changes at lower brightness levels. Therefore, a display system with an appropriate Gamma value can better match the way the human eye perceives, making the transition from dark to bright look more natural and smooth. The correct Gamma characteristic helps to maintain details in the image, especially in the mid-tones and dark areas. This is especially important for displaying high-quality photos, videos and other content. The Gamma characteristic also affects the relative brightness between different colors, which in turn affects the overall color balance. Proper Gamma settings can help ensure the correct ratio between basic colors such as red, green and blue, and avoid color distortion. In the design and manufacturing process of LED display screens, only by considering the Gamma characteristics of the screen can the final product present the best visual effects. For professional purposes, such as film screening, TV broadcasting and high-end photography, it is crucial to understand and control the Gamma characteristics of display devices, because users in these fields have very high requirements for image quality. In short, the Gamma characteristics of LED screens are one of the important parameters that determine their display performance, which directly affects the brightness distribution, color reproduction and visual comfort of the image. Although the specific method of gamma correction is not discussed here, understanding the gamma characteristics itself is very helpful for selecting and using the appropriate LED display. Measuring the actual gamma characteristics of the screen is necessary. The traditional method of using a high-precision illuminance meter to measure gamma is accurate, but it can only measure one grayscale at a time, the measurement speed is slow and the measurement equipment is expensive. In addition, the existing gamma characteristic method takes a long time to measure, the measurement equipment is expensive, and has high environmental requirements when measuring low-brightness grayscales. Summary of the invention

[0004] In order to solve the above problems in the prior art, namely, only one grayscale can be measured at a time, the measurement speed is slow, the measurement equipment is expensive, the measurement time is long, and the environmental requirements are high, the present invention provides a method for measuring the gamma characteristics of an LED screen, the method comprising: Group m level values ​​to be tested from small to large, each group has n level values ​​to be tested, and two adjacent groups contain at least one identical level value to be tested; m is the number of all level values ​​to be tested; n is the number of level values ​​to be tested in each group, and n>2; Divide the screen to be measured into n + 1 regions with the same shape and size; the measured level values of each group are all displayed on the screen to be measured; for the measured level values of any group, one region of the screen to be measured is used to display the reference level value, and the remaining n regions are used to respectively display the n measured level values of this group; when the measured level values of any group are displayed on the screen to be measured, rotation of the positions of the measured level values is performed, and a photographing result is obtained by taking a photo each time. Based on all the photographing results, the measured brightness value of each measured level value corresponding to each rotation is calculated. Divide each measured brightness value by the measured brightness value of the reference level value of this group to obtain the reference brightness value; based on all the reference brightness values, divide the reference brightness value of the a-th measured level value in each current region of the screen to be measured by the reference brightness value of the (a + 1)-th measured level value in the current region to obtain the ratio of the reference brightness values of each adjacent measured level value; take the average of the ratios of the reference brightness values of the adjacent measured level values of the same measured level value in different regions to obtain the final ratio of the reference brightness values of the adjacent measured level values; 0 < a < n; a is the number of the measured level value in the screen to be measured. Based on all the final ratios of the reference brightness values of the adjacent measured level values, splice the m measured level values to obtain the gamma characteristic measurement result of the m measured level values.

[0005] In a preferred embodiment, obtaining a photographing result by taking a photo each time includes: when taking a photo of the screen to be measured, the position of the screen to be measured in the photo remains unchanged.

[0006] In a preferred embodiment, the reference level value is the largest measured level value among the measured level values of its group.

[0007] In a preferred embodiment, for any group of measured level values, when rotating the positions of the measured level values, the number of rotations is not less than 3 times and not more than n times.

[0008] In the second aspect of the present invention, a system for measuring the gamma characteristic of an LED screen is proposed. The system includes: A level value grouping module that groups m measured level values from small to large. Each group has n measured level values, and at least one same measured level value is included in two adjacent groups; m is the number of all measured level values; n is the number of measured level values in each group, and n > 2. A brightness measurement module is used to divide the screen to be measured into n + 1 regions with the same shape and size; the measured level values of each group are all displayed on the screen to be measured; for the measured level values of any group, one region of the screen to be measured is used to display the reference level value, and the remaining n regions are used to respectively display the n measured level values of this group; when the measured level values of any group are displayed on the screen to be measured, the positions of the measured level values are rotated, and a photo is taken each time a rotation is performed to obtain a photo-taking result, and the measured brightness value of each measured level value corresponding to each rotation is calculated based on all the photo-taking results; An average value calculation module is used to divide each measured brightness value by the measured brightness value of the reference level value of this group to obtain the reference brightness value; based on all the reference brightness values, divide the reference brightness value of the a-th measured level value in each current region of the screen to be measured by the reference brightness value of the (a + 1)-th measured level value in the current region to obtain the ratio of the reference brightness values of adjacent measured level values; calculate the average value of the ratios of the reference brightness values of adjacent measured level values of the same measured level value in different regions to obtain the final ratio of the reference brightness values of adjacent measured level values; 0 < a < n; a is the number of the measured level value in the screen to be measured; A result acquisition module is used to splice m measured level values based on all the final ratios of the reference brightness values of adjacent measured level values to obtain the gamma characteristic measurement result of the m measured level values.

[0009] In a third aspect of the present invention, an electronic device is proposed, including: at least one processor; and a memory communicatively connected to at least one of the processors; wherein, the memory stores instructions executable by the processor, and the instructions are used to be executed by the processor to implement the above method for measuring the gamma characteristic of an LED screen.

[0010] In a fourth aspect of the present invention, a computer-readable storage medium is proposed, and the computer-readable storage medium stores computer instructions, and the computer instructions are used to be executed by the computer to implement the above method for measuring the gamma characteristic of an LED screen.

[0011] The beneficial effects of the present invention: (1) The present application provides a method for measuring the gamma characteristic of an LED screen using a consumer-grade single-lens reflex camera, which can obtain the gamma characteristic of the measured LED screen conveniently and quickly at a lower hardware cost; (2) The present application uses the reference area and the rotation display for multiple measurements to eliminate the errors and interferences introduced by the camera and the LED screen in multiple measurements and single measurements, and the measurement result is accurate and reliable; (3) This application can quickly obtain the gamma characteristics of the LED screen by measuring the brightness of multiple groups of level values ​​at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 is a schematic diagram of a method for measuring the gamma characteristics of an LED screen according to an embodiment of the present invention; Figure 2 It is a schematic diagram of displaying n level values ​​to be measured on the screen to be measured in a method for measuring the gamma characteristics of an LED screen according to an embodiment of the present invention; Figure 3 It is a schematic diagram of a method for measuring the gamma characteristic of an LED screen according to an embodiment of the present invention, in which n level values ​​to be measured are rotated for the first time and then displayed on the screen to be measured; Figure 4 It is a schematic diagram of a method for measuring the gamma characteristics of an LED screen according to an embodiment of the present invention, in which n level values ​​to be measured are rotated for a second time and then displayed on the screen to be measured; Figure 5 It is a structural diagram of a computer system of a server for implementing the method, system, and device embodiments of the present application. DETAILED DESCRIPTION

[0013] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0014] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0015] The present invention provides a method for measuring the gamma characteristics of an LED screen, the method comprising: Group m level values ​​to be tested from small to large, each group has n level values ​​to be tested, and two adjacent groups contain at least one identical level value to be tested; m is the number of all level values ​​to be tested; n is the number of level values ​​to be tested in each group, and n>2; Divide the screen to be measured into n + 1 regions with the same shape and size; the measured level values of each group are all displayed on the screen to be measured; for the measured level values of any group, one region of the screen to be measured is used to display the reference level value, and the remaining n regions are used to respectively display the n measured level values of this group; when the measured level values of any group are displayed on the screen to be measured, rotation of the positions of the measured level values is performed, and a photo is taken each time a rotation is made to obtain a photo-taking result, and the measured brightness value of each measured level value corresponding to each rotation is calculated based on all the photo-taking results; Divide each measured brightness value by the measured brightness value of the reference level value of this group to obtain the reference brightness value; based on all the reference brightness values, divide the reference brightness value of the a-th measured level value in each current region of the screen to be measured by the reference brightness value of the (a + 1)-th measured level value in the current region to obtain the ratio of the reference brightness values of each adjacent measured level value; take the average of the ratios of the reference brightness values of adjacent measured level values of the same measured level value in different regions to obtain the final ratio of the reference brightness values of adjacent measured level values; 0 < a < n; a is the number of the measured level value in the screen to be measured; Based on all the final ratios of the reference brightness values of adjacent measured level values, splice the m measured level values to obtain the gamma characteristic measurement result of the m measured level values.

[0016] For a clearer description of the method for measuring the gamma characteristic of the LED screen of the present invention, the following is combined with Figure 1 Expand and describe each step in the embodiment of the present invention in detail.

[0017] The method for measuring the gamma characteristic of the LED screen in the first embodiment of the present invention is described in detail as follows: Fix the relative spatial relationship between the single-lens reflex camera and the screen to be measured, so that the single-lens reflex camera can take pictures of the screen to be measured and then measure the brightness value; Group the m measured level values from small to large, with n measured level values in each group, and at least one same measured level value is included in adjacent groups; m is the number of all measured level values; n is the number of measured level values in each group, and n > 2; The screen to be measured is divided into n + 1 regions with the same shape and size; the measured level values of each group are all displayed on the screen to be measured; for the measured level values of any group, one region of the screen to be measured is used to display the reference level value, usually taking the largest measured level value in the group, and the remaining n regions are used to respectively display the n measured level values of the group; when the measured level values of any group are displayed on the screen to be measured, the positions of the measured level values are rotated, and a photo is taken each time for rotation to obtain a photo result, and the measured brightness value of each measured level value corresponding to each rotation is calculated based on all the photo results; taking a photo each time for rotation to obtain a photo result includes: when taking a photo of the screen to be measured, the position of the screen to be measured in the photo remains unchanged.

[0018] In this embodiment, the method for calculating the measured brightness value of each measured level value corresponding to each rotation is as follows: in the image captured by the camera, for the n + 1 measurement regions, first determine n + 1 regions that are the same in size and shape, can cover the n + 1 measurement regions, and do not overlap. Then calculate the mean value of the sampled images in each region as the measured brightness value of that region. Once these regions are determined, they will not change in subsequent measurements.

[0019] In this embodiment, the reference level value is the largest measured level value among the measured level values of its group. The reference region selects the largest level value among the n measured level values in the current group as the reference level value. As Figure 2 shown, display the n measured level values on the screen to be measured; take a photo to obtain the first group of photo results; Then rotate the level values displayed in the n measurement regions, as Figure 3 shown, rotate the measured level value of E(1) to display E(n), and rotate the measured level value of E(a) to display E(a - 1). Then take a photo and calculate to obtain the second group of photo results; 0 < a < n; a is the number of the measured level value.

[0020] Then rotate again, as Figure 4 shown, take a photo to obtain the third group of photo results; In this embodiment, for any group of measured level values, when rotating the positions of the measured level values, the number of rotations is not less than 3 times and not more than n times.

[0021] The measured brightness values ​​are shown in Table 1 below: L(x, y, z) represents the measured brightness value of the zth level value to be measured in the xth round, the yth area. L(1,Ref,n) is the measured brightness value of the reference level value of the first round, L(1,1,1) is the measured brightness value of the first level value to be measured in the first area of ​​the first round; L(1,2,2) is the measured brightness value of the second level value to be measured in the second area of ​​the first round; L(1,3,3) is the measured brightness value of the third level value to be measured in the third area of ​​the first round; L(1,n,n) is the measured brightness value of the nth level value to be measured in the nth area of ​​the first round; L(2,Ref,n) is the measured brightness value of the reference level value of the second round, L(2,1,n) is the measured brightness value of the nth level value to be measured in the first area of ​​the second round, L(2,2,1) is the measured brightness value of the first level value to be measured in the second area of ​​the second round; L(2,3,2) is the measured brightness value of the second level value to be measured in the third area of ​​the second round; L(2,n,n-1) is the measured brightness value of the n-1th level value to be measured in the nth area of ​​the second round; L(3,Ref,n) is the measured brightness value of the reference level value of the third round; L(3,1,n-1) is the measured brightness value of the n-1th level value to be measured in the first area of ​​the third round; L(3,2,n) is the measured brightness value of the nth level value to be measured in the second area of ​​the third round; L(3,n,n-2) is the measured brightness value of the n-2th level value to be measured in the nth area of ​​the third round; L(f,Ref,n) is the measured brightness value of the reference level value of the fth round; L(f,1,2) is the measured brightness value of the second level value to be measured in the first area of ​​the fth round; L(f,2,3) is the measured brightness value of the third level value to be measured in the second area of ​​the f-th round; L(f,3,4) is the measured brightness value of the fourth level value to be measured in the third area of ​​the f-th round; L(f,n,1) is the measured brightness value of the first level value to be measured in the n-th area of ​​the f-th round; Table 1 Number of rotations Reference area Region 1 Area 2 Area 3 … Region n 1 L(1,Ref,n) L(1,1,1) L(1,2,2) L(1,3,3) … L(1,n,n) 2 L(2,Ref,n) L(2,1,n) L(2,2,1) L(2,3,2) … L(2,n,n-1) 3 L(3,Ref,n) L(3,1,n-1) L(3,2,n) L(3,3,1) … L(3,n,n-2) … … … … … … … f L(f,Ref,n) L(f,1,2) L(f,2,3) L(f,3,4) … L(f,n,1) The measured brightness value of each level value to be measured corresponding to each rotation is divided by the measured brightness value of the reference level value of this group to obtain the reference brightness value; In this embodiment, obtaining the final brightness value specifically includes: in order to correct the error between multiple shooting measurements, the measurement results of all areas are divided by the measured brightness value of the reference level value of the current round of measurement to obtain the reference brightness value, specifically: L'(x,y,z) = L(x,y,z) / L(x,Ref,n), wherein L'(x,y,z) represents the reference brightness value of the zth level value to be measured in the xth round, the yth area, and L(x, Ref,n) is the measured brightness value of the reference level value of the xth round; L'(1,1,1) is the reference brightness value of the first level value to be measured in the first round, the first area, and the first level value to be measured; L'(1,2,2) is the reference brightness value of the second level value to be measured in the first round, the second area, and the second level value to be measured; L'(1,3,3) is the reference brightness value of the third level value to be measured in the first round, the third area, and the third level value to be measured; L'(1,4,4) L'(1,n,n) is the reference brightness value of the 4th level value to be measured in the 1st round, the 4th area; L'(2,1,n) is the reference brightness value of the nth level value to be measured in the 1st round, the nth area; L'(2,2,1) is the reference brightness value of the 1st level value to be measured in the 2nd round, the 2nd area; L'(2,3,2) is the reference brightness value of the 2nd level value to be measured in the 2nd round, the 3rd area; L'(2,4,3) is the reference brightness value of the 3rd level value to be measured in the 2nd round, the 4th area; L'(2,n,n-1) is the reference brightness value of the n-1th level value to be measured in the 2nd round, the nth area; L'(3,1,n-1) L'(3,2,n) is the reference brightness value of the n-1th level value to be measured in the 3rd round, the 1st area; L'(3,3,1) is the reference brightness value of the 1st level value to be measured in the 3rd round, the 3rd area; L'(3,4,2) is the reference brightness value of the 2nd level value to be measured in the 3rd round, the 4th area; L'(3,n,n-2) is the reference brightness value of the n-2th level value to be measured in the 3rd round, the nth area; L'(n,1,2) is the reference brightness value of the 2nd level value to be measured in the nth round, the 1st area; L'(n,2,3) is the reference brightness value of the 3rd level value to be measured in the nth round, the 2nd area; L'(n,3,4) is the reference brightness value of the 4th level value to be measured in the nth round, the 3rd area; L'(n,4,5) is the reference brightness value of the 5th level value to be measured in the nth round, the 4th area; L'(n,n,1) is the reference brightness value of the 1st level value to be measured in the nth round, the nth area; finally, all the reference brightness values ​​are obtained, as shown in Table 2 below; Table 2 Number of rotations Region 1 Area 2 Area 3 Region 4 … Region n 1 L'(1,1,1) L'(1,2,2) L'(1,3,3) L'(1,4,4) … L'(1,n,n) 2 L'(2,1,n) L'(2,2,1) L'(2,3,2) L'(2,4,3) … L'(2,n,n-1) 3 L'(3,1,n-1) L'(3,2,n) L'(3,3,1) L'(3,4,2) … L'(3,n,n-2) … … … … … … … n L'(n,1,2) L'(n,2,3) L'(n,3,4) L'(n,4,5) … L'(n,n,1) Based on all the reference luminance values, for any area in the screen under test, divide the reference luminance value of the a-th measured level value in the current area by the reference luminance value of the a+1-th measured level value in the current area to obtain the ratio of the reference luminance values of the adjacent measured level values in the current area. Finally, obtain the ratios of the reference luminance values of all the adjacent measured level values, where 0 < a < n; a is the number of the measured level value. Based on the ratios of the reference luminance values of all the adjacent measured level values, calculate the average value of the ratios of the reference luminance values of the adjacent measured level values of the same measured level value in different areas to obtain the final ratio of the reference luminance values of the adjacent measured level values. F'(1) = (F(1,1) + F(2,1) + … + F(n,1)) / n. Based on the final ratios of the reference luminance values of all the adjacent measured level values, splice the m measured level values to obtain the gamma characteristic measurement results of the m measured level values. F'(1) is the average value of the ratios of the reference luminance value of the 1st measured level value and the reference luminance value of the 2nd measured level value measured in all areas. F(1,1) is the ratio of the reference luminance value of the 1st measured level value and the reference luminance value of the 2nd measured level value measured in the 1st area. F(2,1) is the ratio of the reference luminance value of the 1st measured level value and the reference luminance value of the 2nd measured level value measured in the 2nd area. F(n,1) is the ratio of the 1st reference luminance value and the 2nd reference luminance value measured in the n-th area.F(2,2) is the ratio of the second reference brightness value measured in the second area to the third reference brightness value; F(3,3) is the ratio of the third reference brightness value measured in the third area to the fourth reference brightness value; F(4,4) is the ratio of the fourth reference brightness value measured in the fourth area to the fifth reference brightness value; F(3,2) is the ratio of the second reference brightness value measured in the third area to the third reference brightness value; F(4,3) is the ratio of the third reference brightness value measured in the fourth area to the fourth reference brightness value, F(n,n-1) is the ratio of the n-1th reference brightness value measured in the nth area to the nth reference brightness value, F(1,n-1) is the ratio of the n-1th reference brightness value measured in the first area to the nth reference brightness value, F(3,1) is the ratio of the n-1th reference brightness value measured in the first area to the nth reference brightness value, is the ratio of the first reference brightness value measured in the third area to the second reference brightness value, F(4,2) is the ratio of the second reference brightness value measured in the fourth area to the third reference brightness value, F(n,n-2) is the ratio of the n-2th reference brightness value measured in the nth area to the n-1th reference brightness value; F(1,2) is the ratio of the second reference brightness value measured in the first area to the third reference brightness value; F(2,3) is the ratio of the third reference brightness value measured in the second area to the fourth reference brightness value; F(3,4) is the ratio of the fourth reference brightness value measured in the third area to the fifth reference brightness value; F(4,5) is the ratio of the fifth reference brightness value measured in the fourth area to the sixth reference brightness value; F(n,1) is the ratio of the first reference brightness value measured in the nth area to the second reference brightness value. Each level value to be measured corresponds to each reference brightness value one by one. For example, the first reference brightness value measured in the nth region corresponds to the first level value to be measured in the nth region. As shown in Table 3;. Table 3 Number of rotations Region 1 Area 2 Area 3 Region 4 … Region n 1 F(1,1) F(2,2) F(3,3) F(4,4) … - 2 - F(2,1) F(3,2) F(4,3) … F(n,n-1) 3 F(1,n-1) - F(3,1) F(4,2) … F(n,n-2) … … … … … … n F(1,2) F(2,3) F(3,4) F(4,5) … F(n,1) In this embodiment, based on the final ratio of the reference brightness values ​​of all adjacent level values ​​to be measured, m level values ​​to be measured are spliced ​​to obtain the gamma characteristic measurement results of the m level values ​​to be measured. Assuming m=2n-1, the measurement is divided into two groups, the first group measures the measured brightness values ​​of the 1st to nth level values ​​to be measured, and the second group measures the measured brightness values ​​of the nth to 2n-1th level values ​​to be measured, and only one level value n is overlapped. At this time, the first group of data obtains the ratio relationship F'(1)_g1~ F'(n-1)_g1, and the second group of data obtains the ratio relationship F'(n)_g2~ F'(2n-2)_g2. This situation does not need to be processed. F'(1)~ F'(n-1) directly takes F'(1)_g1~F'(n-1)_g1, and F'(n)~F'(2n-2) directly takes F'(n)_g2~F'(2n-2)_g2 as the measurement result. Assume that m=2n-2 is divided into two groups of measurements. The first group measures the 1st to nth level values ​​to be measured, and the second group measures the n-1th to 2n-2th level values ​​to be measured. There are two level values ​​n-1 and n that overlap. At this time, the first set of data obtains the ratio relationship F'(1)_g1~ F'(n-1)_g1, and the second set of data obtains the ratio relationship F'(n-1)_g2~ F'(2n-3)_g2. In this case, F'(n-1) has calculation results F'(n-1)_g1 and F'(n-1)_g2 on both sides. It is necessary to calculate the average of them as the final F'(n-1)=(F'(n-1)_g1+ F'(n-1)_g2) / 2, F'(1)~ F'(n-2) directly takes F'(1)_g1~ F'(n-2)_g1, and F'(n)~F'(2n-3) directly takes F'(n)_g2~F'(2n-3)_g2. F'(1)_g1 is the ratio of the reference brightness value of the first level value to be measured measured in all areas in the first group of measurements to the reference brightness value of the second level value to be measured, F'(n-1)_g1 is the ratio of the reference brightness value of the n-1th level value to be measured measured in all areas in the first group of measurements to the reference brightness value of the nth level value to be measured, F'(n-1)_g2 is the ratio of the reference brightness value of the n-1th level value to be measured measured in all areas in the second group of measurements to the reference brightness value of the nth level value to be measured, and F'(n)_g 2 is the average of the ratios of the reference brightness value of the nth level value to be measured measured in all areas in the second group of measurements to the reference brightness value of the n+1th level value to be measured, F'(2n-2)_g2 is the ratio of the reference brightness value of the 2n-2th level value to be measured measured in all areas in the second group of measurements to the reference brightness value of the 2n-1th brightness value to be measured, and F'(2n-3)_g2 is the ratio of the reference brightness value of the 2n-3th level value to be measured measured in all areas in the second group of measurements to the reference brightness value of the 2n-2th level value to be measured.F'(1) is the final ratio of the reference brightness value of the 1st level value to be measured to the reference brightness value of the 2nd level value to be measured in all areas, F'(n-1) is the final ratio of the reference brightness value of the n-1th level value to be measured to the reference brightness value of the nth level value to be measured in all areas, F'(2n-2) is the final ratio of the reference brightness value of the 2n-2th level value to be measured to the reference brightness value of the 2n-1th level value to be measured in all areas, and F'(2n-3) is the final ratio of the reference brightness value of the 2n-3th level value to be measured to the reference brightness value of the 2n-2th level value to be measured in all areas.

[0022] The final ratio of the reference brightness values ​​of all adjacent level values ​​to be measured is shown in Table 4; F'(1) is the final ratio of the reference brightness value of the first level value to be measured to the reference brightness value of the second level value to be measured measured in all areas; F'(1) is the final ratio of the reference brightness value of the first level value to be measured to the reference brightness value of the second level value to be measured measured in all areas; F'(2) is the final ratio of the reference brightness value of the second level value to be measured to the reference brightness value of the third level value to be measured measured in all areas; F'(3) is the final ratio of the reference brightness value of the third level value to be measured to the reference brightness value of the fourth level value to be measured measured in all areas. The final ratio of brightness values; F'(4) is the final ratio of the reference brightness value of the 4th level value to be measured to the reference brightness value of the 5th level value to be measured measured in all areas; F'(m-1) is the final ratio of the reference brightness value of the m-1th level value to be measured to the reference brightness value of the mth level value to be measured measured in all areas; E(1) is the 1st level value to be measured, E(2) is the 2nd level value to be measured, E(3) is the 3rd level value to be measured, E(4) is the 4th level value to be measured, E(5) is the 5th level value to be measured, E(m-1) is the m-1th level value to be measured, and E(m) is the mth level value to be measured.

[0023] Table 4 Brightness Relationship E(1) / E(2) E(2) / E(3) E(3) / E(4) E(4) / E(5) … E(m-1) / E(m) Ratio Mean F'(1) F'(2) F'(3) F'(4) … F'(m-1) Since it is required that adjacent groups must contain at least one identical level value to be measured when grouping the m level values, multiple groups of data can be spliced ​​from the measurement results of the identical level values ​​to be measured, and finally obtain the complete gamma characteristic measurement results of the m level values.

[0024] Although the various steps in the above embodiment are described in the above-mentioned order, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reverse order. These simple changes are within the scope of protection of the present invention.

[0025] The system for measuring the gamma characteristics of an LED screen according to the second embodiment of the present invention, the system includes: A level value grouping module, configured to group m measured level values from small to large, with n measured level values in each group, and at least one same measured level value is included in adjacent groups; m is the number of all measured level values; n is the number of measured level values in each group, and n>2; A brightness measurement module, configured to divide the screen to be measured into n + 1 regions with the same shape and size; the measured level values of each group are all displayed on the screen to be measured; for the measured level values of any group, one region of the screen to be measured is used to display the reference level value, and the remaining n regions are used to respectively display the n measured level values of this group; when the measured level values of any group are displayed on the screen to be measured, the rotation of the positions of the measured level values is performed, and a photo is taken each time a rotation is performed to obtain a photo-taking result, and the measured brightness value of each measured level value corresponding to each rotation is calculated based on all the photo-taking results; An average value calculation module, configured to divide each measured brightness value by the measured brightness value of the reference level value of this group to obtain a reference brightness value; based on all the reference brightness values, divide the reference brightness value of the a-th measured level value in each current region of the screen to be measured by the reference brightness value of the (a + 1)-th measured level value in the current region to obtain the ratio of the reference brightness values of adjacent measured level values; take the average value of the ratios of the reference brightness values of adjacent measured level values of the same measured level value in different regions to obtain the final ratio of the reference brightness values of adjacent measured level values; 0 < a < n; a is the number of the measured level value; A result acquisition module, configured to splice the m measured level values based on all the final ratios of the reference brightness values of adjacent measured level values to obtain the gamma characteristic measurement result of the m measured level values.

[0026] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process and related descriptions of the above-described system can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

[0027] It should be noted that the system for measuring the gamma characteristics of an LED screen provided in the above embodiment is only illustrated by dividing the above functional modules. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiment can be combined into one module, or further split into multiple sub-modules to complete all or part of the functions described above. For the names of the modules and steps involved in the embodiments of the present invention, they are only used to distinguish each module or step, and are not regarded as an improper limitation of the present invention.

[0028] An electronic device according to the third embodiment of the present invention comprises: at least one processor; and a memory communicatively connected to at least one of the processors; wherein the memory stores instructions executable by the processor, and the instructions are used to be executed by the processor to implement the above-mentioned method for measuring the gamma characteristics of an LED screen.

[0029] A fourth embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to be executed by the computer to implement the above-mentioned method for measuring the gamma characteristics of an LED screen.

[0030] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process and related instructions of the storage device and processing device described above can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0031] Those skilled in the art should be able to appreciate that the modules and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two, and the programs corresponding to the software modules and method steps can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the technical field. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0032] Reference below Figure 5 , which shows a schematic diagram of the structure of a computer system of a server for implementing the method, system, and device embodiments of the present application. Figure 5 The server shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0033] like Figure 5As shown, the computer system includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 602 or the program loaded from the storage part 608 to the random access memory (RAM) 603. In the RAM 603, various programs and data required for system operation are also stored. The CPU 601, ROM 602 and RAM 603 are connected to each other through a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0034] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, a mouse, etc.; an output section 607 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 610 as needed so that a computer program read therefrom is installed into the storage section 608 as needed.

[0035] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 609, and / or installed from the removable medium 611. When the computer program is executed by the central processing unit (CPU) 601, the above-mentioned functions defined in the method of the present application are executed. It should be noted that the above-mentioned computer-readable medium of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, - but not limited to - an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection with one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, an apparatus or a device. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in combination with an instruction execution system, an apparatus or a device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0036] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0037] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0038] The terms "first", "second", etc. are used to distinguish similar objects rather than to describe or indicate a particular order or sequence.

[0039] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0040] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for measuring the gamma characteristics of an LED screen, characterized in that: The method includes: Grouping m measured level values from smallest to largest, with n measured level values in each group, and at least one identical measured level value included in adjacent groups; m is the number of all measured level values; n is the number of measured level values in each group, and n > 2; Dividing the screen to be measured into n + 1 regions with the same shape and size; The measured level values of each group are all displayed on the screen to be measured; For the measured level values of any group, one region of the screen to be measured is used to display the reference level value, and the remaining n regions are used to respectively display the n measured level values of this group; When the measured level values of any group are displayed on the screen to be measured, the positions of the measured level values are rotated, and a photographing result is obtained for each rotation. Based on all the photographing results, the measured brightness value of each measured level value corresponding to each rotation is calculated; Dividing each measured brightness value by the measured brightness value of the reference level value of this group to obtain the reference brightness value; Based on all the reference brightness values, dividing the reference brightness value of the a-th measured level value in each current region of the screen to be measured by the reference brightness value of the (a + 1)-th measured level value in the current region to obtain the ratio of the reference brightness values of each adjacent measured level value; Taking the average of the ratios of the reference brightness values of the adjacent measured level values of the same measured level value in different regions to obtain the final ratio of the reference brightness values of the adjacent measured level values; 0 < a < n; a is the number of the measured level value; Based on all the final ratios of the reference brightness values of the adjacent measured level values, splicing the m measured level values to obtain the gamma characteristic measurement result of the m measured level values.

2. The method for measuring the gamma characteristics of an LED screen according to claim 1, characterized in that: Each rotation and photographing to obtain a photographing result includes: When photographing the screen to be measured, the position of the screen to be measured in the photo remains unchanged.

3. The method for measuring the gamma characteristics of an LED screen according to claim 1, characterized in that: The reference level value is the largest measured level value among the measured level values of its group.

4. The method for measuring the gamma characteristics of an LED screen according to claim 1, characterized in that: For any group of measured level values, when rotating the positions of the measured level values, the number of rotations is not less than 3 times and not more than n times.

5. A system for measuring the gamma characteristics of an LED screen, characterized in that: The system includes: A level value grouping module that groups m measured level values from smallest to largest, with n measured level values in each group, and at least one identical measured level value included in adjacent groups; m is the number of all measured level values; n is the number of measured level values in each group, and n > 2; A brightness measurement module for dividing the screen to be measured into n + 1 regions with the same shape and size; The measured level values of each group are all displayed on the screen to be measured; For the measured level values of any group, one region of the screen to be measured is used to display the reference level value, and the remaining n regions are used to respectively display the n measured level values of this group; When the measured level values of any group are displayed on the screen to be measured, the positions of the measured level values are rotated, and a photographing result is obtained for each rotation. Based on all the photographing results, the measured brightness value of each measured level value corresponding to each rotation is calculated; A mean calculation module, configured to divide each measured luminance value by the measured luminance value of the reference level value of this group to obtain a reference luminance value; based on all the reference luminance values, divide the reference luminance value of the ath measured level value in each current area of the screen to be measured by the reference luminance value of the (a + 1)th measured level value in the current area to obtain the ratio of the reference luminance values of each adjacent measured level value; calculate the mean of the ratios of the reference luminance values of the adjacent measured level values of the same measured level value in different areas to obtain the final ratio of the reference luminance values of the adjacent measured level values; 0 < a < n; a is the number of the measured level value in the screen to be measured; A result acquisition module, configured to splice the m measured level values based on the final ratio of the reference luminance values of all the adjacent measured level values to obtain the gamma characteristic measurement result of the m measured level values.

6. An electronic device, characterized in that: Comprising: At least one processor; And A memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the processor, and the instructions are used to be executed by the processor to implement the method for measuring the gamma characteristic of an LED screen according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to be executed by the computer to implement the method for measuring the gamma characteristic of an LED screen according to any one of claims 1-4.

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