CN111369923B - Display screen outlier detection method, detection apparatus, and readable storage medium - Google Patents

Abstract

The invention discloses a display screen abnormal point detection method, detection equipment and readable storage medium. The detection method includes: lighting the display screen, obtaining the display image of the display screen; selecting the object to be measured in the display image. area, perform pixel offset on the area to be measured to cover the corresponding interval area of the interval band in the display image, generate an offset image after performing the pixel offset; detect bright spots in the offset image Dark difference points are abnormal points. The technical solution of the present invention can accurately determine whether dark points are defective pixel points.

Description

Display screen abnormal point detection method, detection equipment and readable storage medium

Technical field

The present invention relates to the technical field of screen detection, and in particular to a method for detecting abnormal points on a display screen, a detection device and a readable storage medium.

Background technique

Display screens have penetrated into all aspects of personal consumer electronics, such as mobile phones, smart watches, tablets, virtual reality and other image display fields. With the continuous advancement of technology, the demand for high-pixel display screens is becoming increasingly strong.

At present, the detection of display screens is usually done manually. As the pixels of the display screen become higher and higher, the difficulty of manual naked-eye detection becomes more and more difficult. Among them, there are intervals between each pixel in the display screen. If the strip does not emit light, it is easy to misjudge the interval strip as a dark defective pixel during manual inspection, causing the problem of being unable to accurately determine whether there are abnormal points on the display screen.

The above content is only used to assist in understanding the technical solutions of the present application, and does not represent an admission that the above content is prior art.

Contents of the invention

Based on this, it is increasingly difficult to detect abnormal points on the display screen with the naked eye. It is easy to misjudge the intervals between pixels as dark bad pixels, resulting in the problem of being unable to accurately determine whether there are abnormal points on the display screen. It is necessary to provide a display screen abnormal point detection method, detection equipment and readable storage medium that can accurately determine whether dark points are defective pixel points.

In order to achieve the above object, the present invention proposes a method for detecting abnormal points on a display screen. Each pixel point of the display screen has a spacing zone. The detection method includes:

Light up the display screen and obtain the display image of the display screen;

Select an area to be measured in the display image, perform pixel offset on the area to be measured to cover the corresponding interval area of the interval band in the display image, and generate an offset image after performing the pixel offset. ;

The light and dark difference points in the offset image are detected as abnormal points.

Optionally, the area to be measured in the display image is selected, and the pixel offset is performed on the area to be measured to cover the corresponding interval area of the interval band in the display image, and the pixel offset is performed. The steps to generate an offset image after shifting include:

Select an area to be measured in the display image, offset the pixels left and right in the area to be measured, and generate a first image;

Shift pixels up and down in the area to be measured to generate a second image;

The first image and the second image are combined to generate the offset image.

Optionally, the step of selecting an area to be measured in the display image, shifting pixels left and right in the area to be measured, and generating the first image further includes:

Select the area to be measured in the display image, perform a pixel left shift on the area to be measured, and generate a first sub-image;

Perform pixel right offset on the area to be measured to generate a second sub-image;

The first sub-image and the second sub-image are combined to generate the first image.

Optionally, the step of shifting the pixels of the area to be measured up and down and generating the second image includes:

Perform pixel up-shift on the area to be measured to generate a third sub-image;

Perform pixel downward offset on the area to be measured to generate a fourth sub-image;

The third sub-image and the fourth sub-image are combined to generate the second image.

Optionally, the display image includes an invalid area outside the edge of the image and an area to be measured within the edge of the image. The area to be measured in the display image is selected and the area to be measured is pixel shifted to cover the area. The interval zone is in the corresponding interval area in the display image, and before the step of generating an offset image after performing the pixel offset, the step includes:

Obtain the image edge of the display image, filter out the invalid area according to the image edge, and obtain the area to be measured within the display image.

Optionally, the step of detecting that light and dark difference points in the offset image are abnormal points includes:

Perform binary black and white processing on the offset image;

Detecting dark points in the offset image processed in black and white, where the dark points are the abnormal points;

The abnormal point position of the display screen is determined according to the position of the abnormal point in the display image.

Optionally, the step of performing binary black-and-white processing on the offset image includes:

The offset image of the binary black and white process is subjected to black and white color inversion.

Optionally, the step of lighting the display screen and obtaining the display image of the display screen includes:

Light up the display screen, increase the brightness of the display screen, control the camera to photograph the display screen, and obtain the display image of the display screen.

In addition, in order to achieve the above object, the present invention also provides a display screen abnormal point detection device. The detection device includes: a memory, a processor, and a display screen abnormal point stored in the memory and operable on the processor. Point detection program; when the display screen abnormal point detection program is executed by the processor, the steps of the display screen abnormal point detection method as described above are implemented.

In addition, in order to achieve the above object, the present invention also provides a readable storage medium. The readable storage medium stores a display screen abnormal point detection program. When the display screen abnormal point detection program is executed by the processor, the display screen abnormal point detection program is implemented as described above. The steps of the display screen abnormal point detection method described above.

In the technical solution proposed by the present invention, the display screen is lit, and in the display screen, there are intervals between each pixel position. After the display is lit, the intervals do not emit light, so the obtained display screen In the displayed image, the interval area corresponding to the interval band is dark. By selecting the area to be measured on the display screen, the area to be measured is pixel shifted to cover the interval area corresponding to the interval band in the display image, so that the color of the interval area changes. It is a bright color, so it can be accurately judged whether the dark point is a defective pixel point.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without exerting creative efforts.

Figure 1 is a schematic flow chart of a first embodiment of a display screen abnormal point detection method according to the present invention;

Figure 2 is a schematic flow chart of a second embodiment of a display screen abnormal point detection method according to the present invention;

Figure 3 is a schematic diagram of the location of abnormal points in the display screen of the present invention;

Figure 4 is a schematic flow chart of a third embodiment of a display screen abnormal point detection method according to the present invention;

Figure 5 is a schematic flow chart of the fourth embodiment of the display screen abnormal point detection method of the present invention;

Figure 6 is a schematic diagram of the location of dark points in the offset image of the present invention;

Figure 7 is a schematic flow chart of the fifth embodiment of the display screen abnormal point detection method of the present invention;

Figure 8 is a schematic diagram of the display image before invalid areas are filtered out according to the present invention;

Figure 9 is a schematic diagram of the display image after filtering out the invalid areas according to the present invention;

Figure 10 is a schematic flow chart of the sixth embodiment of the display screen abnormal point detection method of the present invention;

Figure 11 is a schematic flow chart of the seventh embodiment of the display screen abnormal point detection method of the present invention;

Figure 12 is a schematic diagram of the offset image obtained after color inversion according to the present invention;

FIG. 13 is a schematic flowchart of the eighth embodiment of the display screen abnormal point detection method of the present invention.

The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiment of the present invention are only used to explain the relationship between components in a specific posture (as shown in the drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, descriptions such as "first", "second", etc. in the present invention are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "connection", "fixing", etc. should be understood in a broad sense. For example, "fixing" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on what a person of ordinary skill in the art can implement. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions is possible. It does not exist and is not within the protection scope required by the present invention.

Referring to FIG. 1 , a first embodiment of the present invention is proposed, a method for detecting abnormal points on a display screen, in which each pixel point on the display screen has a spacing band. For example, LCD (abbreviation for Liquid Crystal Display) liquid crystal display screen, in which each pixel position in the LCD screen corresponds to a display unit, and each display unit is separated from each other, that is to say, each pixel is There are spacer strips which are non-luminous. In addition, the display screen also includes an LED (Light Emitting Diode) display screen, and the detection method includes:

Step S10, light the display screen and obtain the display image of the display screen.

Specifically, the display screen is powered on so that the display screen is in a display working state, and the display screen emits light to display images. For example, powering up the display screen makes the display screen glow white. Generally speaking, bad pixels in a display screen include bright spots that are too bright and dark spots that are too low. After lighting the display screen, obtain the display image of the display screen. For example, a display image is obtained by taking a picture with a camera.

Step S20: Select an area to be measured in the display image, perform pixel offset on the area to be measured, so as to cover the corresponding interval area of the interval band in the display image, and generate an offset image after performing pixel offset.

Generally speaking, the area of the displayed image is generally larger. In order to ensure the accuracy of the measurement, a part of the area in the displayed image is selected as the area to be measured. The area to be measured includes an image corresponding to a non-luminous interval zone. The interval zone The corresponding image is also dark, but the display image outside the interval band is a bright color normally displayed. Through pixel offset, the image corresponding to the interval band is covered, thereby avoiding the interference of the interval band on the judgment and detection of abnormal points on the display screen. question.

Step S30: Detect light and dark difference points in the offset image as abnormal points.

Among them, in each display unit corresponding to the display screen, some display units may have excessive brightness due to excessive power or other manufacturing process effects. It is also possible that the display unit cannot work, that is, the abnormal points include bright spots or dark spots, which have a negative impact on the normal display of the display screen. When detecting dark spots, the brightness of the display screen can be increased to highlight the dark spot locations. When detecting a bright spot, the brightness of the display screen can be reduced to highlight the position of the bright spot, thereby avoiding the inability to detect the bright spot of the display screen due to the excessive brightness of the display screen.

In the technical solution of this embodiment, the display screen is lit, and there is a spacer zone between each pixel position in the display screen. After the display screen is lit, the spacer zone position does not emit light, so the obtained display screen In the displayed image, the interval area corresponding to the interval band is dark. By selecting the area to be measured on the display screen, the area to be measured is pixel shifted to cover the interval area corresponding to the interval band in the display image, so that the color of the interval area changes. It is a bright color, so it can be accurately judged whether the dark point is a defective pixel point.

Referring to FIG. 2 , a second embodiment of the present invention is proposed based on the first embodiment of the present invention. The area to be measured in the display image is selected, and the area to be measured is offset by pixels to cover the interval bands in the display image. Step S20 of generating an offset image after performing pixel offset in the corresponding interval area includes:

Step S21: Select an area to be measured in the display image, and offset the pixels of the area to be measured to the left and right to generate a first image.

Referring to FIG. 3 , a schematic diagram showing the position of defective pixels 11 on the display screen 10 is shown. Generally, the display units in the display screen are arranged in rows and columns. From this, it can be known that the corresponding spacing zones of the display units are usually arranged in rows and columns. First, the pixels to be measured are shifted left and right in the area to be measured. The left and right pixel shifts can cover the interval bands set in the columns, and a first image with left and right pixel offsets is obtained. The interval bands set in the rows in the first image are still dark spot areas. In addition, the position of the pixel offset is not fixed. Generally speaking, moving one pixel position can meet the requirement of covering the interval band.

Step S22: Shift the pixels of the area to be measured up and down to generate a second image.

Secondly, the pixels are shifted up and down through the area to be measured. The up and down shifting of the pixels in the area to be measured can cover the spacing strips set in the rows, thereby obtaining a second image with pixels shifted up and down. Generally speaking, moving the position of one pixel can meet the requirement of covering the interval band. Among them, the interval band set in the second image is still a dark spot area.

Step S23, combine the first image and the second image to generate an offset image.

Combining the first image and the second image means superimposing the first image and the second image, so that the first image and the second image can cover each other's row and column settings, thereby generating The offset image can effectively cover the intervals between each pixel point, thereby avoiding the impact of the intervals on the dark spot area.

In addition, in the process of obtaining the display image, it is usually captured by a camera. In the process of the camera capturing the display image, noise may appear in the display image due to camera exposure, and the pixels in the area to be measured are shifted up and down, and The left and right offset of the pixels in the area to be measured can eliminate the noise in the displayed image.

Referring to FIG. 4 , a third embodiment of the present invention is proposed based on the second embodiment of the present invention. The step S21 of selecting the area to be measured in the display image, performing left and right pixel shifts on the area to be measured, and generating the first image is Also includes:

Step S210, select the area to be tested in the display image, perform pixel left shift on the area to be tested, and generate the first sub-image; for example, the area to be tested is 1280*800 pixels, so it can be seen that the number of columns in the area to be tested is 1280 Column, after left-shifting the pixels of the area to be measured, the first sub-image with a column number of 1279 is obtained.

Step S211: Right-shift the pixels of the area to be tested to generate a second sub-image; for example, the area to be tested is 1280*800 pixels. It can be seen that the number of columns in the area to be tested is 1280 columns, and the area to be tested is shifted to the right. After shifting, the second sub-image with a column number of 1279 is obtained. By moving the area to be measured to the left and right respectively, the number of pixels in the left and right translation is the same, ensuring that the first sub-image and the second sub-image have the same number of pixel columns, making it easier for the first sub-image and the second sub-image to overlap each other. .

Among them, step S211 may be located before step S210. That is to say, the area to be measured may be pixel-shifted to the left first, and then the area to be measured may be pixel-shifted to the right. You can also move the area to be measured by pixel translation to the right first, and then move the area to be measured by pixel translation to the left.

Step S212: Combine the first sub-image and the second sub-image to generate a first image. Usually, it is difficult to completely cover the spacer band with one pixel shift. The area of the spacer band is further covered through the combination of the first sub-image and the second sub-image to ensure the covering effect of the spacer band set in the column.

Referring to FIG. 5 , a fourth embodiment of the present invention is proposed based on the third embodiment of the present invention. The pixels of the area to be measured are shifted up and down, and the step S22 of generating the second image includes:

Step S220: Perform pixel upward offset on the area to be measured to generate a third sub-image; for example, the area to be measured is 1280*800 pixels. From this, it can be seen that the number of rows in the area to be measured is 800 lines, and the area to be measured is offset on pixels. After shifting, the third sub-image with a row number of 799 is obtained.

Step S221: Perform pixel downward shift on the area to be tested to generate a fourth sub-image; for example, the area to be tested is 1280*800 pixels. From this, it can be seen that the number of rows in the area to be tested is 800 lines, and the area to be tested is shifted downward on pixels. After shifting, the fourth sub-image with a column number of 799 is obtained. By moving the area to be measured upward and downward respectively, the number of pixels in the upper and lower translations is the same, ensuring that the third sub-image and the fourth sub-image can have the same number of pixel rows, making it easier for the third sub-image and the fourth sub-image to overlap each other.

Step S222: Combine the third sub-image and the fourth sub-image to generate a second image. Usually, it is difficult to completely cover the spacer band with one pixel shift. The area of the spacer band is further covered through the combination of the third sub-image and the fourth sub-image to ensure the covering effect of the spacer band set in rows.

Referring to FIG. 6 , which is a schematic diagram of the offset image 20 , the offset image 20 and the dark spots 21 in the offset image 20 can be seen.

Referring to Figure 7, a fifth embodiment of the present invention is proposed based on the first to fourth embodiments of the present invention. The displayed image includes an invalid area outside the edge of the image and an area to be measured within the edge of the image. Select the display For the area to be measured in the image, pixel offset is performed on the area to be measured to cover the corresponding interval area of the interval band in the display image. Step S20 of generating an offset image after performing pixel offset includes:

Step S40: Obtain the image edge of the displayed image, filter out invalid areas according to the image edges, and obtain the area to be measured within the displayed image.

Among them, after the display screen is processed, it usually has some light-transmitting areas in the peripheral area of the display screen. This part of the light-transmitting area affects the normal detection of the display screen. By obtaining the image edge position of the display image, the invalid area is filtered out according to the image edge, that is, the area outside the image edge is blackened, thereby avoiding the influence of the light-transmitting area around the display screen, so as to obtain an accurate range of the area to be measured area.

See Figure 8 for a schematic diagram before filtering out the invalid area. See Figure 9 for a schematic diagram after filtering out the invalid area. It can be seen that the invalid area includes light-transmitting white contours. Filtering out the white contours can Effectively reduce the impact of light transmission areas.

Referring to Figure 10, a sixth embodiment of the present invention is proposed based on the fifth embodiment of the present invention. The step S30 of detecting the difference between light and dark points in the offset image as abnormal points includes:

Step S31, perform binary black-and-white processing on the offset image; specifically, the binary black-and-white processing is to set a threshold. If the brightness value in the offset image is lower than the set threshold, the corresponding pixel point is set to black. , if the brightness value in the offset image is higher than the set threshold, the corresponding pixel is set to white. For example, if the binary value range is an integer between 0 and 255, the threshold is set to 150. If the brightness value of the pixel is lower than 150, the corresponding position in the offset image will be converted into black. If the brightness value of the pixel is higher than 150, the offset will be black. Move the corresponding position in the image to white.

Step S32: detect dark points in the black-and-white processed offset image, and the dark points are abnormal points.

Usually pixel abnormal points are dark spots. By comparing and analyzing the brightness values in the black and white post-processed images, the location and number of the dark spots can be determined. In other words, a standard value is set, and those that meet the standard value are dark spots in the offset image.

Step S33: Determine the location of the abnormal point on the display screen based on the location of the abnormal point in the display image.

Specifically, the position and number of abnormal points in the display image can be obtained through comparative analysis. According to the position of the abnormal points, and through the position correspondence between the display image and the display screen, the position of the abnormal points on the display screen can be determined.

Referring to Figure 11, a seventh embodiment of the present invention is proposed based on the sixth embodiment of the present invention. The step S31 of binarizing the offset image into black and white includes:

Step S34: Perform black and white color inversion on the binary black and white processed offset image. Generally speaking, white points are easier to detect in black images, so the black and white color inversion of the binary black-and-white offset image is performed, that is, the original black points are converted into white points, and the original white areas are converted into black areas. , which makes it easier to detect the location and number of abnormal points.

Refer to Figure 12, which shows the offset image obtained after color inversion. The visible white points represent pixel abnormal points and are clearly visible.

Referring to Figure 13, an eighth embodiment of the present invention is proposed based on the first embodiment of the present invention. The step S10 of lighting the display screen and acquiring the display image of the display screen includes:

Step S11, light the display screen, increase the brightness of the display screen, control the camera to capture the display screen, and obtain the display image of the display screen.

Specifically, when the display screen is photographed by a camera, since the location of abnormal points is usually a dark point, increasing the brightness of the display screen can make the location of the dark point on the display screen more prominent, making it easier to detect the location and number of abnormal points.

The present invention also provides a display screen abnormal point detection device. The detection device includes: a memory, a processor, and a display screen abnormal point detection program stored in the memory and executable on the processor; the display screen The screen abnormal point detection device calls the display screen abnormal point detection stored in the memory through the processor and performs the following operations

Light up the display screen and obtain the display image of the display screen;

Select an area to be measured in the display image, perform pixel offset on the area to be measured to cover the corresponding interval area of the interval band in the display image, and generate an offset image after performing the pixel offset. ;

The light and dark difference points in the offset image are detected as abnormal points.

Further, the processor calls the display screen abnormal point detection program stored in the memory, and also performs the following operations:

Select an area to be measured in the display image, perform pixel offset on the area to be measured, so as to cover the corresponding interval area of the interval band in the display image, and generate an offset after performing the pixel offset. The steps to move an image include:

Select an area to be measured in the display image, offset the pixels left and right in the area to be measured, and generate a first image;

Shift pixels up and down in the area to be measured to generate a second image;

The first image and the second image are combined to generate the offset image.

Further, the processor calls the display screen abnormal point detection program stored in the memory, and also performs the following operations:

The steps of selecting an area to be measured in the display image, shifting pixels left and right in the area to be measured, and generating the first image also include:

Select the area to be measured in the display image, perform a pixel left shift on the area to be measured, and generate a first sub-image;

Perform pixel right offset on the area to be measured to generate a second sub-image;

The first sub-image and the second sub-image are combined to generate the first image.

Further, the processor calls the display screen abnormal point detection program stored in the memory, and also performs the following operations:

The step of shifting pixels up and down on the area to be measured to generate a second image includes:

Perform pixel up-shift on the area to be measured to generate a third sub-image;

Perform pixel downward offset on the area to be measured to generate a fourth sub-image;

The third sub-image and the fourth sub-image are combined to generate the second image.

Further, the processor calls the display screen abnormal point detection program stored in the memory, and also performs the following operations:

The display image includes an invalid area outside the edge of the image and an area to be measured within the edge of the image. The area to be measured in the display image is selected and pixel offset is performed on the area to be measured to cover the interval zone. In the corresponding interval area in the display image, the step of generating an offset image after performing the pixel offset includes:

Obtain the image edge of the display image, filter out the invalid area according to the image edge, and obtain the area to be measured within the display image.

Further, the processor calls the display screen abnormal point detection program stored in the memory, and also performs the following operations:

The step of detecting that light and dark difference points in the offset image are abnormal points includes:

Perform binary black and white processing on the offset image;

Detecting dark points in the offset image processed in black and white, where the dark points are the abnormal points;

The abnormal point position of the display screen is determined according to the position of the abnormal point in the display image.

Further, the processor calls the display screen abnormal point detection program stored in the memory, and also performs the following operations:

The step of performing binary black-and-white processing on the offset image includes:

The offset image of the binary black and white process is subjected to black and white color inversion.

Further, the processor calls the display screen abnormal point detection program stored in the memory, and also performs the following operations:

The steps of lighting the display screen and obtaining the display image of the display screen include:

Light up the display screen, increase the brightness of the display screen, control the camera to photograph the display screen, and obtain the display image of the display screen

The present invention also provides a readable storage medium. A display screen abnormal point detection program is stored on the readable storage medium. When the display screen abnormal point detection program is executed by a processor, the display screen abnormal point detection as described above is implemented. Method steps.

For the specific implementation of the readable storage medium of the present invention, reference can be made to the above embodiments of the display screen abnormal point detection method, which will not be described again here.

It should be noted that, as used herein, the terms "include", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or system that includes a list of elements not only includes those elements, but It also includes other elements not expressly listed or that are inherent to the process, method, article or system. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in the process, method, article, or system that includes that element.

The above serial numbers of the embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product that is essentially or contributes to the existing technology. The computer software product is stored in a storage medium (such as ROM/RAM) as mentioned above. , magnetic disk, optical disk), including several instructions to cause a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the method described in various embodiments of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the inventive concept of the present invention, equivalent structural transformations can be made using the contents of the description and drawings of the present invention, or directly/indirectly used in other applications. Relevant technical fields are included in the patent protection scope of the present invention.

Claims (7)

1. A method for detecting abnormal points of a display screen, wherein a spacing band is arranged between every two pixel points of the display screen, the method comprising:

a display screen is lightened, and a display image of the display screen is obtained;

selecting a region to be detected in the display image, and performing pixel left offset on the region to be detected to generate a first sub-image;

performing pixel right offset on the region to be detected to generate a second sub-image;

combining the first sub-image and the second sub-image to generate a first image;

performing pixel upper offset on the region to be detected to generate a third sub-image;

performing pixel lower offset on the region to be detected to generate a fourth sub-image;

combining the third sub-image and the fourth sub-image to generate a second image;

combining the first image and the second image to generate an offset image, wherein offset units of the left offset, the right offset, the upper offset and the lower offset are all one pixel so as to meet the requirement of covering the interval belt;

and detecting the bright and dark difference points in the offset image as abnormal points.

2. The method for detecting abnormal points of a display screen according to claim 1, wherein the display image includes an invalid region outside an image edge and a region to be detected inside the image edge, the selecting the region to be detected in the display image, and performing pixel shifting on the region to be detected to cover a corresponding interval region of the interval band in the display image, and the step of generating a shifted image after performing the pixel shifting includes:

and acquiring an image edge of the display image, filtering the invalid region according to the image edge, and acquiring the region to be detected in the display image.

3. The display screen outlier detection method according to claim 2, wherein said step of detecting that the bright-dark outlier in the offset image is an outlier comprises:

performing binarization black-and-white processing on the offset image;

detecting dark points in the offset image subjected to the black-and-white processing, wherein the dark points are abnormal points;

and determining an abnormal point position of the display screen according to the position of the abnormal point in the display image.

4. The display screen outlier detection method according to claim 3, wherein said step of performing binarization black-and-white processing on said offset image comprises:

and performing black-and-white color inversion on the offset image by the binarized black-and-white processing.

5. The display screen outlier detection method according to claim 1, wherein the step of lighting up the display screen and acquiring the display image of the display screen comprises:

and (3) lighting a display screen, improving the brightness of the display screen, controlling a camera to shoot the display screen, and acquiring a display image of the display screen.

6. A display screen outlier detection apparatus, characterized by comprising: the display screen abnormal point detection device comprises a memory, a processor and a display screen abnormal point detection program, wherein the display screen abnormal point detection program is stored in the memory and can run on the processor; the display screen outlier detection program when executed by the processor implements the steps of the display screen outlier detection method according to any one of claims 1 to 5.

7. A readable storage medium, wherein a display screen outlier detection program is stored on the readable storage medium, which when executed by a processor, implements the steps of the display screen outlier detection method according to any one of claims 1 to 5.