CN111508397A - Display panel detection method and display panel detection device - Google Patents
Display panel detection method and display panel detection device Download PDFInfo
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- CN111508397A CN111508397A CN202010328865.6A CN202010328865A CN111508397A CN 111508397 A CN111508397 A CN 111508397A CN 202010328865 A CN202010328865 A CN 202010328865A CN 111508397 A CN111508397 A CN 111508397A
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Abstract
The invention provides a detection method of a display panel, which comprises the following steps: extracting the brightness values of N color channels when the display panel to be detected displays the image, and calculating the ratio of the selected basic brightness values to obtain a basic brightness ratio; extracting brightness values of N color channels of a region to be detected in a display panel to be detected, calculating the ratio of the selected region brightness values to obtain a region brightness ratio, and calculating the difference between the brightness ratio and the region brightness ratio; and judging whether the difference value is within a preset threshold range, thereby judging whether the area to be detected is a color cast area. A detection device of the display panel is also provided. By adopting the detection method and the detection device of the display panel, the problem that the error detection or over-detection is easily caused by a simple algorithm of subtracting the brightness values of a plurality of color channels from each other when the color cast region is judged in the conventional detection method can be solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a detection method and a detection device of a display panel.
Background
When the defect of the display panel is inspected, the image capturing effect of the display panel has chromatic aberration due to various interference factors of non-real defects, such as the Gamma difference of the display panel, the OTP difference of the modules, the white balance difference of the image capturing camera, and the like, so that the accuracy of the final detection result is affected.
Disclosure of Invention
In view of this, embodiments of the present invention are directed to providing a method for detecting a display panel, so as to solve the problem of abnormal detection results caused by interference factors of unreal defects in the display panel in the prior art.
An embodiment of the present invention provides a method for detecting a display panel, including:
extracting the brightness values of N color channels when the display panel to be detected displays an image, and respectively recording the brightness values as a first color basic brightness value and a second color basic brightness value … … Nth color basic brightness value;
selecting at least two basic brightness values from the first color basic brightness value and the second color basic brightness value … … Nth color basic brightness value, and calculating the ratio of the selected basic brightness values to respectively obtain a first basic brightness ratio and a second basic brightness ratio … … Nth basic brightness ratio;
extracting the brightness values of N color channels of each pixel point in a region to be detected in a display panel to be detected, and recording the brightness values as a first color region brightness value and a second color region brightness value … … Nth color region brightness value;
selecting at least two region brightness values from the first color region brightness value and the second color region brightness value … … nth color region brightness value of each pixel point, calculating the ratio of the selected region brightness values, and respectively obtaining the first region brightness ratio and the second region brightness ratio … … nth region brightness ratio of each pixel point;
calculating the difference between the first basic brightness ratio and the first area brightness ratio to obtain a first difference, calculating the difference between the second basic brightness ratio and the second area brightness ratio to obtain a second difference, and calculating the difference between the nth basic brightness ratio and the nth area brightness ratio to obtain an nth difference by … …;
respectively judging whether the first difference value and the nth difference value … … are within a preset threshold range, so as to judge whether color cast is bad at each pixel point position in the area to be detected; wherein N is greater than or equal to 2, and N is greater than or equal to 1.
In an embodiment of the present invention, the step of extracting luminance values of N color channels when the display panel to be detected displays an image, which are respectively recorded as a first color basic luminance value and a second color basic luminance value … … nth color basic luminance value includes:
and lighting the display panel to be detected to display a color picture, respectively obtaining the brightness value of the first color channel of each pixel point and the brightness value of the Nth color channel of the second color channel of … …, and calculating the average value of the brightness values of the color channels of all the pixel points to obtain the basic brightness value of the first color and the basic brightness value of the Nth color of the second color of … ….
In an embodiment of the present invention, the step of determining whether the first difference and the nth difference … … are within a preset threshold range respectively, thereby determining whether a color cast defect exists at each pixel position in the region to be detected includes determining that a color cast defect exists at a pixel position in the region to be detected when any difference exceeds the preset threshold range.
In an embodiment of the invention, the predetermined threshold range is-0.05 to 0.05.
In an embodiment of the present invention, respectively determining whether the first difference value and the nth difference value of the second difference value … … are within a preset threshold range, thereby determining whether a color cast defect exists at each pixel position in the region to be detected, and then further including: and performing operation processing on the first difference value and the nth difference value … … to obtain a processed difference value, performing binarization operation on the processed difference value, and presenting a judgment result.
In an embodiment of the invention, the operation process includes taking the absolute value of the nth difference of the first difference and the second difference … …, and performing a multiplier or a power operation on the absolute value.
In another aspect, an embodiment of the present invention further provides a device for detecting a display panel, including:
the first acquisition module is used for acquiring the basic brightness ratio of the display panel to be detected;
the second acquisition module is used for respectively acquiring the region brightness ratio of each pixel point in the region to be detected in the display panel to be detected;
the judging module is used for respectively comparing the basic brightness ratio acquired by the first acquiring module with the regional brightness ratio of each pixel point acquired by the second acquiring module, and judging whether the difference value of the basic brightness ratio and the regional brightness ratio is within a preset threshold range, so as to judge whether color cast is bad at the position of each pixel point in the region to be detected;
the basic brightness ratio is the ratio of the brightness values of at least two of the N color channels when the display panel to be detected displays the image, the area brightness ratio is the ratio of the brightness values of at least two of the N color channels of the pixel points in the area to be detected in the display panel to be detected, and N is larger than or equal to 2.
In an embodiment of the present invention, the first obtaining module includes:
the basic brightness value acquisition module is used for extracting the brightness values of the N color channels when the display panel to be detected displays an image, and the brightness values are respectively recorded as a first color basic brightness value and a second color basic brightness value … … Nth color basic brightness value;
the basic brightness value processing module is used for selecting at least two basic brightness values from the first color basic brightness value and the Nth color basic brightness value of the second color basic brightness value … …, calculating the ratio of the selected basic brightness values, and respectively obtaining a first basic brightness ratio and a second basic brightness ratio … … Nth basic brightness ratio; wherein n is greater than or equal to 1.
In an embodiment of the present invention, the second obtaining module includes:
the region brightness value acquisition module is used for extracting the brightness values of N color channels of each pixel point in a region to be detected in the display panel to be detected, and recording the brightness values as a first color region brightness value and a second color region brightness value … … Nth color region brightness value;
the region brightness value processing module is used for selecting at least two region brightness values from the first color region brightness value and the Nth color region brightness value of the second color region brightness value … … of each pixel point, calculating the ratio of the selected region brightness values, and respectively obtaining the first region brightness ratio and the Nth region brightness ratio of the second region brightness ratio … … of each pixel point;
wherein n is greater than or equal to 1.
In an embodiment of the present invention, the apparatus further includes an operation processing module, where the operation processing module is configured to perform operation processing on the difference value and present a determination result.
The beneficial effects of the invention include: by adopting the detection method and the detection device of the display panel, the problem that the error detection or over-detection is easily caused by a simple algorithm of subtracting the brightness values of a plurality of color channels from each other when the color cast region is judged in the conventional detection method can be solved. The detection method and the detection device provided by the invention have few interference factors, can better present the defects in actual display, and effectively improve the accuracy of the detection result. The detection method and the detection device provided by the invention have the advantages of wide application range and simplicity in operation.
Drawings
Fig. 1 is a schematic step diagram of a method for detecting a display panel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the steps of extracting the luminance values of the N color channels when the display panel to be detected displays an image according to an embodiment of the present invention.
Fig. 3 is a schematic view of a detection apparatus for a display panel according to an embodiment of the present invention.
Fig. 4 is a schematic view of a detection apparatus for a display panel according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventor finds that interference factors of unreal defects can affect the accuracy of detection results when a display panel is detected, specifically, when AOI detects panel color cast defects, especially O L ED color cast defects, a traditional method uses an algorithm of subtracting RGB three-channel brightness values two by two to extract a part with an over-limit difference value to determine the color cast.
Fig. 1 is a schematic diagram of a detection method of a display panel according to an embodiment of the invention. As shown in fig. 1. An embodiment of the present invention provides a color cast detection method for a display panel, including:
s1, extracting the brightness values of the N color channels when the display panel to be detected displays the image, and respectively recording the brightness values as a first color basic brightness value and a second color basic brightness value … … Nth color basic brightness value;
s2, selecting at least two basic brightness values from the first color basic brightness value and the second color basic brightness value … … Nth color basic brightness value, and calculating the ratio of the selected basic brightness values to respectively obtain a first basic brightness ratio and a second basic brightness ratio … … Nth basic brightness ratio;
s3, extracting the brightness values of N color channels of each pixel point in a to-be-detected region in the to-be-detected display panel, and recording the brightness values as a first color region brightness value and a second color region brightness value … … Nth color region brightness value;
s4, selecting at least two region brightness values from the first color region brightness value and the Nth color region brightness value of the second color region brightness value … … of each pixel point, calculating the ratio of the selected region brightness values, and respectively obtaining the first region brightness ratio and the second region brightness ratio … … of each pixel point;
s5, calculating the difference between the first basic brightness ratio and the first area brightness ratio to obtain a first difference, calculating the difference between the second basic brightness ratio and the second area brightness ratio to obtain a second difference, and calculating the difference between the nth basic brightness ratio and the nth area brightness ratio to obtain an nth difference by … …;
s6, respectively judging whether the first difference value and the nth difference value of the second difference value … … are within a preset threshold range, and thus judging whether color cast is bad at the position of each pixel point in the area to be detected; wherein N is greater than or equal to 2, and N is greater than or equal to 1.
By the method, the problem that the existing detection method is easy to cause false detection or over-detection due to the influence of the self color difference of the display panel to be detected when the existing detection method only adopts a simple algorithm of subtracting the brightness values of the plurality of color channels from each other can be solved. The detection method provided by the invention has the advantages of less interference factors, capability of better presenting the defects in actual display, effective improvement of the accuracy of the detection result, wide application range and simple operation.
It is understood that the sequence of the above steps is not fixed, and the basic luminance value may be obtained first, or the region luminance value may be obtained first, or both, as long as the object of the present invention is achieved.
Specifically, when color cast type defect detection is performed on the display panel to be detected, luminance values of N color channels when the display panel to be detected displays an image are extracted, taking 3 color channels as an example, such as three color channels R, G, and B, which are respectively marked as a first color basic luminance value L R0, a second color basic luminance value L G0, and a third color basic luminance value L0 B0., at least two basic luminance values are selected from a first color basic luminance value L1R 0, a second color basic luminance value L G0, and a third color basic luminance value L B0, further, 2 basic luminance values are selected, for example, a first color basic luminance value L R0 and a second color basic luminance value L G0 are selected, ratios of the basic luminance values selected are calculated, a first basic luminance ratio L R0/L G0 is obtained respectively, a second basic luminance ratio L G0/L R0. can understand that when a ratio or a ratio of each pixel point in the display panel to be detected in the acquisition is consistent with a ratio of the color cast type or a color channel to be detected, and the ratio of the color channel to be detected, and the ratio or the overall luminance value of the display panel to be obtained should be detected.
Further, the brightness values of 3 color channels (three color channels of R, G and B) of each pixel point in the region to be detected in the display panel to be detected are extracted and recorded as a first color region brightness value L R1, a second color region brightness value L G1 and a third color region brightness value L0B 1, 2 region brightness values are selected from the first color region brightness value L1R 1, the second color region brightness value L G1 and the third color region brightness value L B1, namely a first color region brightness value L R1 and a second color region brightness value L G1, the ratio of the selected region brightness values is calculated, the first region brightness ratio L R1/L G1 and the second region brightness ratio L G1/L R1 of each pixel point in the region to be detected are respectively obtained, and the mode of obtaining the region brightness values of each color channel of each pixel point in the region to be detected in the display panel to be detected is consistent with the mode of obtaining the brightness values of each color channel of the display panel to be detected.
And respectively calculating the difference between the first basic brightness ratio L R0/L G0 and the first region brightness ratio L R1/L G1 to obtain a first difference, and calculating the difference between the second basic brightness ratio L G0/L R0 and the second region brightness ratio L G1/L R1 to obtain a second difference.
And respectively judging whether the first difference value and the second difference value are within a preset threshold range, so as to judge whether color cast is bad at the position of each pixel point in the region to be detected.
In the embodiment of the present invention, the luminance value when the display image of the display panel to be detected is extracted is taken as 3 color channels, and in other embodiments, 2 color channels, 4 color channels, or more color channels may also be selected. After the luminance values of the plurality of color channels are obtained, when the luminance ratios are obtained based on the luminance values of the plurality of color channels, a plurality of luminance ratios can be obtained, in this embodiment, 2 luminance ratios are selected as an example, and in other embodiments, 1 luminance ratio, 3 luminance ratios, or more luminance ratios can be selected.
In an embodiment of the invention, as shown in fig. 2, the step S1 of extracting the luminance values of the N color channels when the display panel to be detected displays the image, which are respectively recorded as the first color basic luminance value and the second color basic luminance value … … nth color basic luminance value, includes: s11, lighting the display panel to be detected to display a color picture; s12, obtaining the brightness value of the first color channel of each pixel point and the brightness value of the … … nth color channel of the second color channel, respectively, calculating the average value of the brightness values of the color channels of all the pixel points, and obtaining the basic brightness value of the first color and the basic brightness value of the nth color of the second color … ….
Specifically, taking extracting the brightness values of 3 color channels (R channel, G channel, and B channel) as an example, the display panel to be detected is lighted up to display a color picture, the brightness value of the first color channel, the brightness value of the second color channel, and the brightness value of the third color channel of each pixel point are respectively obtained, the average value of the brightness values of the color channels of all the pixel points is calculated and recorded as a first color basic brightness value L R0, a second color basic brightness value L G0, and a third color basic brightness value L B0.
The mode for acquiring the basic brightness value of each color in the embodiment of the present invention may be selected in many ways, and is not limited to the above mode, as long as the brightness value of each color channel of the display panel to be detected can be acquired. As can be understood, the manner of obtaining the region brightness value of each color channel of each pixel point of the region to be detected of the display panel to be detected is consistent with the manner of obtaining the brightness value of each color channel of the display panel to be detected. And will not be described in detail herein.
In an embodiment of the present invention, step S6 is to respectively determine whether the first difference value and the nth difference value of the second difference value … … are within a preset threshold range, thereby determining whether color cast is poor at the position of each pixel point in the area to be detected, including determining whether color cast is poor at the position of the pixel point in the area to be detected when any difference value exceeds the preset threshold range, specifically, taking determination of 2 difference values as an example for one pixel point, where the first basic luminance ratio L R0/L G1.0625 is 1.0625, the first area luminance ratio L R1/L G1 is 1.125, the difference value between the two is-0.0625, which is the first difference value 1, the second basic luminance ratio L G0/L R0 is 1.0625, the second area luminance ratio L G1/L R7 is 1.0625, the difference value between the two is 0, which is the second difference value C2, respectively determine whether the two difference values are within the preset threshold ranges, if the two difference values are within the preset threshold ranges, it is no longer possible to select multiple pixel points in the color cast range, and whether multiple pixel points are in the color cast range, and whether multiple pixel points can be determined based on the color cast.
Further, the preset threshold range is-0.05. The inventor finds that by adopting the preset threshold range, whether color cast is bad at each pixel point position in the area to be detected can be effectively judged, the result is easy to present, and the false detection rate is low.
In an embodiment of the present invention, step S6 is to respectively determine whether the first difference value and the second difference value … … -th difference value are within a preset threshold range, thereby determining whether color cast is poor at each pixel position in the region to be detected, and then the method further includes performing operation on the first difference value and the second difference value … … -th difference value to obtain a processed difference value, performing binarization operation on the processed difference value, and presenting a determination result.
Based on the same inventive concept, another aspect of the embodiments of the present invention further provides a detection apparatus for a display panel. Fig. 3 is a schematic diagram of a detection apparatus for a display panel according to an embodiment of the present invention. As shown in fig. 4, the detecting device includes: the device comprises a first acquisition module 1, a second acquisition module 2 and a judgment module 3, wherein the first acquisition module 1 is used for acquiring the basic brightness ratio of the display panel to be detected; the second obtaining module 2 is configured to obtain a region brightness ratio of each pixel point in a region to be detected in the display panel to be detected; and the judging module 3 is configured to compare the basic brightness ratio acquired by the first acquiring module with the area brightness ratio acquired by the second acquiring module, and judge whether a difference between the basic brightness ratio and the area brightness ratio is within a preset threshold range, so as to judge whether color cast at each pixel point position in the area to be detected is poor. In this embodiment, the basic brightness ratio is a ratio of brightness values of at least two of the N color channels when the display panel to be detected displays an image, the area brightness ratio is a ratio of brightness values of at least two of the N color channels of the pixel point in the area to be detected in the display panel to be detected, and N is greater than or equal to 2. By adopting the detection device, the problem that false detection or over-detection is easily caused by a simple algorithm of subtracting the brightness values of a plurality of color channels from each other when the color cast region is judged in the conventional detection method can be solved. The detection device provided by the invention has few interference factors, can better present the defects in actual display, effectively improves the accuracy of the detection result, and has wide application range and simple operation.
In another embodiment of the present invention, as shown in fig. 4, the first obtaining module 1 includes: the device comprises a basic brightness value acquisition module 11 and a basic brightness value 12 processing module, wherein the basic brightness value acquisition module 11 is configured to extract brightness values of N color channels when a display panel to be detected displays an image, and the brightness values are respectively recorded as a first color basic brightness value and a second color basic brightness value … … nth color basic brightness value. The basic brightness value processing module 12 is configured to select at least two basic brightness values from the first color basic brightness value and the second color basic brightness value … …, calculate a ratio of the selected basic brightness values, and obtain a first basic brightness ratio and a second basic brightness ratio … …, where N is greater than or equal to 1.
In another embodiment of the present invention, as shown in fig. 4, the second obtaining module 2 includes: the display panel detection device comprises a region brightness value acquisition module 21 and a region brightness value processing module 22, wherein the region brightness value acquisition module 21 is configured to extract brightness values of N color channels of a region to be detected in a display panel to be detected, and the brightness values are recorded as a first color region brightness value and a second color region brightness value … … nth color region brightness value. The region brightness value processing module 22 is configured to select at least two region brightness values from a first color region brightness value and an nth color region brightness value of a second color region brightness value … … of each pixel, calculate a ratio of the selected region brightness values, and obtain a first region brightness ratio of each pixel, a second region brightness ratio … … nth region brightness ratio, where N is greater than or equal to 1.
In an embodiment of the present invention, as shown in fig. 4, the present invention further includes an operation processing module 4, where the operation processing module 4 is configured to perform operation processing on the difference value and present a determination result. Further, the operation processing module 4 performs operation processing on the difference value to obtain a processed difference value, performs binarization operation on the processed difference value, and presents a judgment result. Further, the operation process includes taking the absolute value of the difference, and performing a multiplier or a power operation on the absolute value. The adoption of the operation processing module can make the differentiation degree more obvious, can better present the defect result in actual display, and effectively improves the accuracy of the detection result.
It should be understood that the terms "first" and "second" used in the description of the embodiments of the present invention are only used for clearly illustrating the technical solutions, and are not used for limiting the protection scope of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A method for detecting a display panel, comprising:
extracting the brightness values of N color channels when the display panel to be detected displays an image, and respectively recording the brightness values as a first color basic brightness value and a second color basic brightness value … … Nth color basic brightness value;
selecting at least two basic brightness values from the first color basic brightness value, the second color basic brightness value … … and the Nth color basic brightness value, and calculating the ratio of the selected basic brightness values to respectively obtain a first basic brightness ratio and a second basic brightness ratio … … which is an nth basic brightness ratio;
extracting the brightness values of N color channels of each pixel point in the to-be-detected area in the to-be-detected display panel, and recording the brightness values as a first color area brightness value and a second color area brightness value … … Nth color area brightness value;
selecting at least two region brightness values from the first color region brightness value, the second color region brightness value … … and the Nth color region brightness value of each pixel point, calculating the ratio of the selected region brightness values, and respectively obtaining the first region brightness ratio and the second region brightness ratio … … (nth region brightness ratio) of each pixel point;
calculating the difference between the first basic brightness ratio and the first area brightness ratio to obtain a first difference, calculating the difference between the second basic brightness ratio and the second area brightness ratio to obtain a second difference, and calculating the difference between the nth basic brightness ratio and the nth area brightness ratio to obtain an nth difference by … …;
respectively judging whether the first difference value and the nth difference value … … are within a preset threshold range, so as to judge whether color cast is bad at the position of each pixel point in the area to be detected; wherein N is greater than or equal to 2, and N is greater than or equal to 1.
2. The method according to claim 1, wherein the step of extracting luminance values of N color channels when the display panel to be detected displays an image, which are respectively recorded as a first color basic luminance value and a second color basic luminance value … … nth color basic luminance value, comprises:
and lighting the display panel to be detected to display a color picture, respectively obtaining the brightness value of the first color channel of each pixel point and the brightness value of the Nth color channel of the second color channel … …, and calculating the average value of the brightness values of the color channels of all the pixel points to obtain the basic brightness value of the first color and the basic brightness value of the Nth color of the second color … ….
3. The method according to claim 1, wherein the step of determining whether the first difference value and the nth difference value … … are within a preset threshold range respectively to determine whether there is color misregistration at each of the pixel positions in the region to be detected comprises determining that there is color misregistration at the pixel positions in the region to be detected when any of the difference values exceeds the preset threshold range.
4. The method for detecting the display panel according to any one of claims 1 to 3, wherein the predetermined threshold is in a range of-0.05 to 0.05.
5. The method for detecting a display panel according to claim 4, wherein the step of respectively determining whether the first difference value and the nth difference value … … are within a preset threshold range, thereby determining whether there is a color misregistration at each pixel point in the region to be detected, further comprises: and performing operation processing on the first difference value, the second difference value … … and the nth difference value to obtain the processed difference value, performing binarization operation on the processed difference value, and presenting a judgment result.
6. The method as claimed in claim 7, wherein the operation process comprises performing a multiplier or power operation on the absolute value of the first difference, the second difference … … and the nth difference.
7. An apparatus for inspecting a display panel, comprising:
the first acquisition module is used for acquiring the basic brightness ratio of the display panel to be detected;
the second acquisition module is used for respectively acquiring the region brightness ratio of each pixel point in the region to be detected in the display panel to be detected;
the judging module is used for respectively comparing the basic brightness ratio acquired by the first acquiring module with the regional brightness ratio of each pixel point acquired by the second acquiring module, and judging whether the difference value of the basic brightness ratio and the regional brightness ratio is within a preset threshold range, so as to judge whether color cast is bad at the position of each pixel point in the region to be detected;
the basic brightness ratio is the ratio of the brightness values of at least two of the N color channels when the display panel to be detected displays an image, the area brightness ratio is the ratio of the brightness values of at least two of the N color channels of the pixel points in the area to be detected in the display panel to be detected, and N is greater than or equal to 2.
8. The apparatus for detecting a display panel according to claim 7, wherein the first obtaining module comprises:
the basic brightness value acquisition module is used for extracting the brightness values of the N color channels when the display panel to be detected displays an image, and the brightness values are respectively recorded as a first color basic brightness value and a second color basic brightness value … … Nth color basic brightness value;
and a basic brightness value processing module, configured to select at least two basic brightness values from the first color basic brightness value, the second color basic brightness value … …, and the nth color basic brightness value, and calculate a ratio of the selected basic brightness values to obtain a first basic brightness ratio and a second basic brightness ratio … … nth basic brightness ratio, respectively; wherein n is greater than or equal to 1.
9. The apparatus for detecting a display panel according to claim 7, wherein the second obtaining module comprises:
the region brightness value acquisition module is used for extracting the brightness values of the N color channels of each pixel point in the region to be detected in the display panel to be detected, and recording the brightness values as a first color region brightness value and a second color region brightness value … … Nth color region brightness value;
and a region brightness value processing module, configured to select at least two region brightness values from the first color region brightness value, the second color region brightness value … …, and the nth color region brightness value of each pixel point, calculate a ratio of the selected region brightness values, and obtain a first region brightness ratio and a second region brightness ratio … … nth region brightness ratio of each pixel point, respectively;
wherein n is greater than or equal to 1.
10. The apparatus according to any one of claims 7 to 9, further comprising an arithmetic processing module, wherein the arithmetic processing module is configured to perform arithmetic processing on the difference and present a judgment result.
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