Gamma debugging method, gamma debugging device and computer readable storage medium

Abstract

The present application provides a gamma debugging method, a gamma debugging device, and a computer-readable storage medium, which are applied to a display panel, wherein the display panel includes a first display area and a second display area, the transmittance of the first display area is less than the transmittance of the second display area, and the first display area includes a debugging area; wherein the gamma debugging method includes: performing gamma debugging on the debugging area according to a first target brightness of a preset grayscale, obtaining a first correspondence between the brightness after debugging and the grayscale; determining a second target brightness of the preset grayscale based on the first target brightness and a brightness compensation parameter of the second display area relative to the first display area; performing gamma debugging on the debugging area based on the second target brightness, obtaining a second correspondence between the brightness after debugging and the grayscale; applying the first correspondence to the first display area, and applying the second correspondence to the second display area. In the above manner, the present application can reduce the display difference between the first display area and the second display area.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a gamma debugging method, a gamma debugging device, and a computer-readable storage medium. Background Art

[0002] In pursuit of a high screen-to-body ratio, full-screen display panels have emerged. Full-screen display panels generally contain multiple display areas, and part of the display area is used to correspond to the position of the under-screen camera.

[0003] Generally speaking, the transmittance of the display area corresponding to the under-screen camera is greater than the transmittance of the display areas at other positions; when all display areas in the display panel share a set of gamma voltages, the brightness of the display area corresponding to the under-screen camera will be lower than the brightness of the display areas at other positions, that is, there is a display difference in the display panel. Summary of the Invention

[0004] The present application provides a gamma debugging method, a gamma debugging device, and a computer-readable storage medium to reduce the display difference between a first display area and a second display area.

[0005] To solve the above technical problems, a technical solution adopted in the present application is: providing a gamma debugging method for a display panel, the gamma debugging method being applied to a display panel, the display panel including a first display area and a second display area, the transmittance of the first display area being less than the transmittance of the second display area, and the first display area including a debugging area; wherein the gamma debugging method includes: performing gamma debugging on the debugging area according to a first target brightness of a preset grayscale, and obtaining a first corresponding relationship between the brightness after debugging and the grayscale; determining a second target brightness of the preset grayscale based on the first target brightness and a brightness compensation parameter of the second display area relative to the first display area; performing gamma debugging on the debugging area based on the second target brightness of the preset grayscale, and obtaining a second corresponding relationship between the brightness after debugging and the grayscale; applying the first corresponding relationship to the first display area, and applying the second corresponding relationship to the second display area.

[0006] To solve the above technical problems, another technical solution adopted in this application is: providing a gamma debugging device, including a memory and a processor coupled to each other, wherein the processor and the memory cooperate with each other to implement the gamma debugging method described in any of the above embodiments.

[0007] To solve the above technical problems, another technical solution adopted in this application is: providing a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the gamma debugging method described in any of the above embodiments is implemented.

[0008] Different from the prior art, the present application has the following advantages: the display panel provided by the present application includes a first display area and a second display area, and the transmittance of the first display area is lower than that of the second display area, and a debugging area is defined within the first display area. The gamma debugging method provided by the present application includes: performing a first gamma debugging on the debugging area according to a first target brightness of a preset grayscale to obtain a first correspondence between the brightness after debugging and the grayscale; then determining a second target brightness of the preset grayscale based on the first target brightness of the preset grayscale and a brightness compensation parameter of the second display area relative to the first display area; then performing gamma debugging on the debugging area based on the second target brightness to obtain a second correspondence between the brightness after debugging and the grayscale; and finally applying the first correspondence to the first display area and the second correspondence to the second display area. As can be seen, the present application uses the debugging area within the first display area to debug the brightness of the first display area and the brightness of the second display area, so that the brightness difference between the first display area and the second display area is small during actual display, or even remains consistent, thereby improving the display effect of the display panel. In addition, the above debugging process is relatively simple, solving the problem in the prior art that normal debugging cannot be performed due to the second display area being too small. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0010] Figure 1 This is a schematic structural diagram of an embodiment of a display panel of the present application;

[0011] Figure 2 A schematic diagram showing an embodiment of displaying a white image with 255 gray levels in the first display area and the second display area;

[0012] Figure 3 This is a flow chart of an implementation method of the gamma debugging method of the present application;

[0013] Figure 4 A schematic diagram of an embodiment of an actual correspondence relationship of the second display area when the first correspondence relationship is applied to the first display area or the second correspondence relationship is applied to the second display area;

[0014] Figure 5 This is a schematic structural diagram of another embodiment of the display panel of the present application;

[0015] Figure 6 This is a structural diagram of an embodiment of the gamma debugging device of the present application;

[0016] Figure 7 This is a structural diagram of an embodiment of a computer-readable storage medium of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0018] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of a display panel of the present application. The display panel 1 can be an OLED display panel, etc. The display panel 1 includes a first display area 10 and a second display area 12, and the transmittance of the first display area 10 is lower than the transmittance of the second display area 12.

[0019] Optionally, the second display area 12 is used to correspond to the under-screen camera, and the size of the second display area 12 can be much smaller than the size of the first display area 10.

[0020] Alternatively, to increase the light transmittance of the second display area 12 to be greater than that of the first display area 10, at least one of the following methods may be employed: Method 1: The pixel arrangement of the first display area 10 is the same as that of the second display area 12, and the sub-pixel size of the first display area 10 is larger than that of the sub-pixel size of the second display area 12. Method 2: The size of the second pixel driving circuit at the location of the second display area 12 is smaller than the size of the first pixel driving circuit in the first display area 10; to ensure that the driving capabilities of the first display area 10 and the second display area 12 are consistent and that uniformity between the first display area 10 and the second display area 12 is improved, the capacitance value of the second pixel driving circuit is consistent with the capacitance value of the first pixel driving circuit.

[0021] In the prior art, although the driving capabilities of the first display area 10 and the second display area 12 are kept consistent through design methods such as capacitance values, due to the difference in actual light-emitting areas of the first display area 10 and the second display area 12, when the first display area 10 and the second display area 12 share a set of gamma voltages and when the first display area 10 and the second display area 12 display pure color images of the same grayscale, Figure 2As shown in Figure (a), when the first display area 10 and the second display area 12 display a 255-grayscale white image, there is a difference in display brightness between the first display area 10 and the second display area 12, and the brightness of the second display area 12 is lower than that of the first display area 10. In addition, due to the small size of the second display area 12, the detection area of the probe of existing commonly used debugging equipment may be larger than the size of the second display area 12, making it difficult for the probe to accurately detect the brightness of the second display area 12. This difficulty in accurately detecting the brightness of the second display area 12 leads to difficulties in the gamma debugging process of the second display area 12.

[0022] In order to solve at least some of the above technical problems, Figure 1 As shown, the present application defines a debugging area 100 in the first display area 10; see Figure 3 , Figure 3 This is a flow chart of an embodiment of the gamma adjustment method of the present application. The gamma adjustment method provided by the present application includes:

[0023] S101: performing gamma adjustment on the adjustment area 100 according to a first target brightness of a preset grayscale, and obtaining a first corresponding relationship between the brightness after adjustment and the grayscale.

[0024] Specifically, generally speaking, the brightness perceived by the human eye is not in a linear relationship with the actual display brightness of the display panel. In a low-brightness environment, the human eye is more sensitive to changes in brightness, and vice versa in a high-brightness environment. This characteristic of the human eye is called the gamma characteristic. Due to the nonlinear perception of brightness by the human eye, if people need to obtain a uniformly changing brightness experience, the brightness displayed by the display panel needs to change non-uniformly to adapt to the gamma characteristics of the human eye. The nonlinear parameters of the brightness and grayscale of the display panel can be called gamma parameters, and the brightness and grayscale curve drawn according to the gamma parameters is called a gamma curve. The gamma parameters describe the nonlinear relationship between brightness and grayscale, that is, the nonlinear relationship between brightness and gamma voltage. Therefore, if the brightness and grayscale of the display panel do not conform to the target gamma curve, the gamma voltage of the display panel needs to be corrected.

[0025] Furthermore, the specific process of step S101 includes: A. adjusting the display parameters (e.g., brightness and / or color) corresponding to the preset grayscale in the debugging area 100 to a first target brightness, and obtaining a grayscale voltage corresponding to the adjusted preset grayscale. Optionally, the preset grayscale can be a larger grayscale such as 255 or 245. For example, if the preset grayscale is 255, its corresponding first target brightness is set to 500 nits. B. obtaining grayscale voltages corresponding to other grayscales other than the preset grayscale based on the adjusted grayscale voltage corresponding to the preset grayscale. For example, the grayscale voltages corresponding to other grayscales can be obtained using interpolation. C. inputting the grayscale voltages of each grayscale obtained in the previous step into the debugging area 100, testing to obtain a first correspondence (i.e., a gamma curve) of the debugging area 100 at this time, and obtaining a first gamma parameter of the first correspondence. D. terminating the debugging process if the first gamma parameter is the first preset value. If the first gamma parameter is not the first preset value, fine-tuning the grayscale voltages of each grayscale until the first gamma parameter is the first preset parameter.

[0026] Optionally, after debugging, the first gamma parameter of the first corresponding relationship is 2.2. This parameter design can achieve a better display effect of the display panel.

[0027] S102: Determine a second target brightness of a preset grayscale based on the first target brightness and a brightness compensation parameter of the second display area relative to the first display area.

[0028] Specifically, the brightness compensation parameter can be an empirical value or a preset value, and the process of obtaining the brightness compensation parameter can be as follows: before the above step S101, at least one sample can be extracted in advance from multiple display panels of the same model produced in the same batch; since the multiple display panels are of the same model produced in the same batch, the display conditions between the multiple display panels are similar. Then, when the sample displays a pure color image of a preset grayscale (for example, a white image, a green image, a red image, or a blue image, etc.), the first average brightness of the first display area 10 and the second average brightness of the second display area 12 are obtained; the difference between the first average brightness and the second average brightness is obtained, and the ratio of the difference to the first average brightness is used as the brightness compensation parameter. Since the size of the second display area 12 of the sample is small, in order to improve the accuracy of the above second average brightness, the second display area 12 of the sample can be measured multiple times and averaged.

[0029] On this basis, the remaining display panels except the sample can be Figure 1Gamma adjustment is performed according to the steps in [1]. Furthermore, the specific implementation process of step S102 can be: obtaining the product of the first target brightness and the brightness compensation parameter, and using the sum of this product and the first target brightness as the second target brightness; wherein the brightness compensation parameter is greater than 0 and less than 1. The above process of obtaining the second target brightness is relatively simple and has a low computational complexity. For example, when the first target brightness corresponding to grayscale 255 is 500 nits and the brightness compensation parameter is 10%, the corresponding second target brightness is 550 nits.

[0030] Of course, in other embodiments, when the brightness compensation parameter is calculated using other methods, the corresponding process for obtaining the second target brightness will also be adjusted accordingly. For example, when the brightness compensation parameter is the difference between the first average brightness and the second average brightness of the sample, the second target brightness is the sum of the first target brightness and the brightness compensation parameter.

[0031] S103: performing gamma adjustment on the adjustment area based on a second target brightness of a preset grayscale, and obtaining a second corresponding relationship between the brightness after adjustment and the grayscale.

[0032] Specifically, the implementation process of the above-mentioned step S103 mainly includes: A. adjusting the display parameters (e.g., brightness and / or color) corresponding to the preset grayscale in the debugging area 100 to the second target brightness, and obtaining the grayscale voltage corresponding to the adjusted preset grayscale. B. obtaining the grayscale voltages corresponding to grayscales other than the preset grayscale based on the adjusted grayscale voltage corresponding to the preset grayscale; for example, the grayscale voltages corresponding to the other grayscales can be obtained using an interpolation method; C. inputting the grayscale voltages of each grayscale obtained in the previous step into the debugging area 100, testing to obtain the second corresponding relationship (i.e., gamma curve) of the debugging area 100 at this time, and obtaining the second gamma parameter of the second corresponding relationship; D. if the second gamma parameter is the second preset value, then debugging ends; if the second gamma parameter is not the second preset value, then fine-tuning the grayscale voltages of each grayscale until the second gamma parameter is the second preset parameter.

[0033] Optionally, the second gamma parameter of the second correspondence is greater than the first gamma parameter of the first correspondence. This design approach can make the final debugging result more consistent with the second display area 12 and can minimize the brightness difference between the second display area 12 and the first display area 10.

[0034] Furthermore, when the first gamma parameter is 2.2, the second gamma parameter is greater than 2.2 and less than or equal to 2.4; for example, the second gamma parameter is 2.23, 2.25, 2.28, 2.33, 2.35, 2.38, etc. The specific second gamma parameter can be adjusted according to actual conditions, and the design of the first gamma parameter and the second gamma parameter can achieve a better display effect of the final display panel.

[0035] In addition, the second gamma parameter can be an empirical value or a preset value, and its acquisition process can be as follows: before the above-mentioned step S101, at least one sample is extracted from multiple display panels of the same model produced in the same batch; since the multiple display panels are of the same model produced in the same batch, the display conditions of the multiple display panels are similar. Gamma debugging is performed on the debugging area 100 of the sample to obtain a first corresponding relationship, and the first corresponding relationship has a first gamma parameter; then gamma debugging is continued on the debugging area of the sample to obtain a second corresponding relationship, and the first corresponding relationship and the second corresponding relationship are applied to the second display area respectively; when the display brightness of the second display area is consistent with that of the first display area, debugging is stopped; otherwise, the process returns to the step of continuing gamma debugging on the debugging area of the sample to obtain the second corresponding relationship. After debugging is completed, the gamma parameter corresponding to the second corresponding relationship of the debugging area of the sample can be obtained, and this gamma parameter is used as the second gamma parameter. To make the second gamma parameter more accurate, the number of samples can be multiple, and multiple second gamma parameters can be obtained. The average of the multiple second gamma parameters is used as the final second gamma parameter to be applied to the remaining display panels.

[0036] S104: Apply the first corresponding relationship to the first display area, and apply the second corresponding relationship to the second display area.

[0037] Specifically, the implementation process of step S104 includes: obtaining grayscale voltages corresponding to grayscales of different brightness levels based on a first correspondence, converting the grayscale voltages into corresponding first register values to obtain a first register value table, and burning the first register value table; and obtaining grayscale voltages corresponding to grayscales of different brightness levels based on a second correspondence, converting the grayscale voltages into corresponding second register values to obtain a second register value table, and burning the second register value table. A subsequent driver chip can directly access the first register value table and the second register value table to drive the corresponding first and second display areas for display.

[0038] As can be seen, in this application, the debugging area within the first display area is used to debug the brightness of the first display area and the brightness of the second display area, so that the difference in brightness between the first display area and the second display area during actual display is small, thereby improving the display effect of the display panel. In addition, the above debugging process is relatively simple, and the debugging area can be selected according to the debugging needs. When the size of the debugging area is larger than the size of the second display area, the problem of normal debugging failure caused by the second display area being too small in the prior art is solved.

[0039] In one embodiment, when the first correspondence is applied to the first display area and the second correspondence is applied to the second display area, the first correspondence between the brightness and grayscale of the first display area is the same as the actual correspondence between the brightness and grayscale of the second display area. This design approach can reduce the display difference between the multiple display areas of the display panel to zero, thereby achieving a better display effect.

[0040] In an application scenario, such as Figure 4 As shown, Figure 4 This is a schematic diagram of an embodiment of the actual correspondence relationship of the second display area when the first correspondence relationship is applied to the first display area or the second correspondence relationship is applied to the second display area. As can be seen from the figure, both the first display area and the second display area conform to the curve with a gamma parameter of 2.2, and the display difference between the two is relatively low. For example, Figure 2 As shown in FIG. 2( b ), when the first display area 10 and the second display area 12 display a white image with a grayscale of 255, the difference in display brightness between the first display area 10 and the second display area 12 is relatively small.

[0041] In another embodiment, please refer again to Figure 1 The area of the debugging area 100 is larger than the area of the second display area 12. For example, the area of the debugging area 100 is larger than the detection area of the probe of the commonly used debugging equipment. This design method allows the probe of the commonly used debugging equipment to accurately obtain the brightness of the debugging area 100.

[0042] Furthermore, the debugging area 100 can be positioned adjacent to the second display area 12. Generally, display panels experience IR drop (i.e., voltage drop). Positioning the debugging area 100 adjacent to the second display area 12 can minimize the impact of the voltage drop between the debugging area 100 and the second display area 12, resulting in better results when the debugging results of the debugging area 100 are applied to the second display area 12.

[0043] Further, if Figure 1 As shown, the second display area 12 is adjacent to the edge of the first display area 10 (eg, Figure 1 The center point P1 of the debugging area 100 is located between the center point P2 of the first display area 10 and the center point P3 of the second display area 12. This design approach is equivalent to placing the debugging area 100 below the second display area 12, rather than on its left or right side. The debugging area 100 is adjacent to the center point P2 of the first display area 10. Because the debugging area 100 is also used to debug the first correspondence applied to the first display area 10, this design approach can achieve a better display effect when the first correspondence debugged by the debugging area 100 is applied to the first display area 10.

[0044] Alternatively, as Figure 1As shown, the distance d1 between the center point P1 of the debugging area 100 and the center point P2 of the first display area 10 is greater than the distance d2 between the center point P1 of the debugging area 100 and the center of the second display area 12. This design allows the debugging area 100 to be designed adjacent to the second display area 12, so that the results of debugging in the debugging area 100 can be applied to the second display area 12 with better results.

[0045] Alternatively, if Figure 1 As shown, there is only one second display area 12, and the line connecting the center point P1 of the debugging area 100 and the center point P3 of the second display area 12 is parallel to the extension direction X of the data line (not shown) of the display panel 1. This design method can make the debugging results of the debugging area 100 more suitable for the situation of the second display area 12.

[0046] Alternatively, if Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of another embodiment of the display panel of the present application. There are multiple second display areas 12, and each of these second display areas 12 shares the same debugging area 100. The same second correspondence applies to all of the second display areas 12. This design simplifies the gamma debugging process and reduces the difficulty of gamma debugging.

[0047] Alternatively, as Figure 5 As shown, multiple second display areas 12 can be arranged at intervals along one side edge of the first display area 10. In the interval arrangement direction Y of the multiple second display areas 12, the length L1 of the debugging area 100 can be greater than the total length L2 of the multiple second display areas 12 and the intervals between adjacent second display areas 12.

[0048] See also Figure 6 , Figure 6This is a structural diagram of an embodiment of the gamma debugging device of the present application. The gamma debugging device includes a memory 20 and a processor 22 coupled to each other, and the processor 22 cooperates with the memory 20 to implement the gamma debugging method mentioned in any of the above embodiments. Specifically, the processor 22 can also be called a CPU (Center Processing Unit). The processor 22 may be an integrated circuit chip with signal processing capabilities. The processor 22 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 22 can be implemented by an integrated circuit chip.

[0049] See also Figure 7 , Figure 7 This is a structural diagram of an embodiment of a computer-readable storage medium of the present application. The computer-readable storage medium 30 stores computer-executable instructions 300. When the processor executes the computer-executable instructions 300, the gamma debugging method mentioned in any of the above embodiments is implemented.

[0050] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation methods described above are only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0051] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0052] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0053] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0054] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A gamma adjustment method for a display panel, characterized in that: The display panel includes a first display area and a second display area, the transmittance of the first display area is lower than the transmittance of the second display area, and the first display area includes a debugging area; wherein the gamma debugging method includes: Performing gamma adjustment on the adjustment area according to a first target brightness of a preset grayscale to obtain a first corresponding relationship between the brightness after adjustment and the grayscale; determining a second target brightness of the preset grayscale based on the first target brightness and a brightness compensation parameter of the second display area relative to the first display area; performing gamma adjustment on the adjustment area based on a second target brightness of the preset grayscale to obtain a second corresponding relationship between brightness and grayscale after adjustment; The first corresponding relationship is applied to the first display area, and the second corresponding relationship is applied to the second display area.

2. The gamma adjustment method according to claim 1, wherein: The first corresponding relationship has a first gamma parameter, the second corresponding relationship has a second gamma parameter, and the second gamma parameter is greater than the first gamma parameter.

3. The gamma debugging method according to claim 2, wherein: The first gamma parameter is 2.2, and the second gamma parameter is greater than 2.2 and less than or equal to 2.

4.

4. The gamma adjustment method according to claim 3, wherein: The second gamma parameter is 2.

28.

5. The gamma adjustment method according to claim 1, wherein: The step of determining the second target brightness of the preset grayscale based on the first target brightness and a brightness compensation parameter of the second display area relative to the first display area includes: A product of the first target brightness and the brightness compensation parameter is obtained, and a sum of the product and the first target brightness is used as the second target brightness; wherein the brightness compensation parameter is greater than 0 and less than 1.

6. The gamma adjustment method according to claim 1, wherein: The debugging area is larger than the second display area, and the debugging area is disposed adjacent to the second display area.

7. The gamma adjustment method according to claim 6, wherein: The second display area is adjacent to an edge of the first display area, the center point of the debugging area is located between the center point of the first display area and the center point of the second display area, and the distance between the center point of the debugging area and the center point of the first display area is greater than the distance between the center point of the debugging area and the center of the second display area.

8. The gamma adjustment method according to claim 6, wherein: The number of the second display area is one, and a line connecting a center point of the debugging area and a center point of the second display area is parallel to an extending direction of a data line of the display panel.

9. The gamma adjustment method according to claim 6, wherein: There are multiple second display areas, and the multiple second display areas share the same debugging area. The same second corresponding relationship is applied to all the second display areas.

10. A gamma debugging device, characterized in that: The method comprises a memory and a processor coupled to each other, wherein the processor and the memory cooperate with each other to implement the gamma debugging method according to any one of claims 1 to 9.

11. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions. When a processor executes the computer-executable instructions, the gamma debugging method according to any one of claims 1 to 9 is implemented.

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