A power terminal liquid crystal display detection method and system

Abstract

The application relates to a power terminal liquid crystal display detection method and system, and relates to the technical field of liquid crystal screen detection.The method comprises the following steps: collecting a display detection trigger signal of a preset dot matrix liquid crystal display screen; a preset positioning assembly is controlled to respond to the display detection trigger signal so as to align a preset image collection assembly to the dot matrix liquid crystal display screen; the preset dot matrix liquid crystal display screen is controlled to display preset display detection parameters, and the image collection assembly is controlled to shoot the dot matrix liquid crystal display screen to generate a display detection image; the display detection image is subjected to image analysis processing to generate a display detection result, and the display detection result is uploaded to a preset host computer for storage.The application has the effect of improving the display detection precision of the dot matrix liquid crystal display screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal screen detection, and in particular to a power terminal liquid crystal display detection method and system. BACKGROUND

[0002] Dot matrix liquid crystal display screens are widely used in terminal products in the power industry to display important data such as power parameters, setting parameters, and stored data parameters. Therefore, the dot matrix liquid crystal display screens are required to not have problems such as display of random codes, no display on a page, mura, non-lighting of dot matrix, and non-lighting of backlight.

[0003] In related technologies, the display of a dot matrix liquid crystal display screen is usually detected by a person using eyes. The person outputs various characters and symbols on the dot matrix liquid crystal display screen to determine whether the displayed characters and symbols are complete, so as to determine whether the display of the dot matrix liquid crystal display screen is normal.

[0004] In the related technologies described above, the display problems of the dot matrix liquid crystal display screen are determined by a person using eyes. On the one hand, the efficiency is low. On the other hand, the person will have visual fatigue after a long time of viewing, which will cause errors and missed detection of defective products, and thus the display detection accuracy of the dot matrix liquid crystal display screen is low, and there is still room for improvement. SUMMARY

[0005] To improve the display detection accuracy of the dot matrix liquid crystal display screen, the present application provides a power terminal liquid crystal display detection method and system.

[0006] In a first aspect, the present application provides a power terminal liquid crystal display detection method, which adopts the following technical solution:

[0007] A power terminal liquid crystal display detection method, comprising:

[0008] acquiring a display detection trigger signal of a preset dot matrix liquid crystal display screen;

[0009] a preset positioning assembly is responsive to the display detection trigger signal to align a preset image acquisition assembly with the dot matrix liquid crystal display screen;

[0010] controlling the preset dot matrix liquid crystal display screen to display preset display detection parameters, and controlling the image acquisition assembly to capture the dot matrix liquid crystal display screen to generate a display detection image;

[0011] performing image analysis and processing on the display detection image to generate a display detection result, and uploading the display detection result to a preset host computer for storage.

[0012] Optionally, the step of the preset positioning assembly being responsive to the display detection trigger signal to align the preset image acquisition assembly with the dot matrix liquid crystal display screen comprises:

[0013] acquire a current display pattern center position and a reset center position of the image acquisition component based on the display detection trigger signal;

[0014] calculate a coordinate of a midpoint of a line connecting the current display pattern center position and the reset center position to generate an acquisition image position;

[0015] determine active positioning parameters according to the current display pattern center position and the acquisition image position;

[0016] determine acquisition positioning parameters according to the reset center position and the acquisition image position;

[0017] control the positioning component to move the image acquisition component and the dot-matrix LCD screen according to the active positioning parameters and the acquisition positioning parameters so that the image acquisition component is aligned with the dot-matrix LCD screen.

[0018] Optionally, the step of controlling the positioning component to move the image acquisition component and the dot-matrix LCD screen according to the active positioning parameters and the acquisition positioning parameters so that the image acquisition component is aligned with the dot-matrix LCD screen comprises:

[0019] controlling the positioning component to move the image acquisition component and the dot-matrix LCD screen according to the active positioning parameters and the acquisition positioning parameters, and acquiring a current display pattern type;

[0020] finding out corresponding acquisition distance parameters in a preset pattern acquisition parameter relationship according to the current display pattern type;

[0021] acquiring a horizontal alignment trigger signal;

[0022] controlling the positioning component to move the image acquisition component according to the acquisition distance parameters in response to the horizontal alignment trigger signal so that the image acquisition component is aligned with the dot-matrix LCD screen.

[0023] Optionally, the step of controlling the positioning component to move the image acquisition component according to the acquisition distance parameters in response to the horizontal alignment trigger signal so that the image acquisition component is aligned with the dot-matrix LCD screen comprises:

[0024] controlling the positioning component to move the image acquisition component according to the acquisition distance parameters in response to the horizontal alignment trigger signal, and acquiring a use tilt angle of the dot-matrix LCD screen;

[0025] acquiring a fixed orientation of the dot-matrix LCD screen;

[0026] determining an angle flip direction of the dot-matrix LCD screen according to the fixed orientation;

[0027] controlling the positioning component to flip the image acquisition component and the dot-matrix LCD screen synchronously according to the use tilt angle and the angle flip direction so that the image acquisition component is aligned with the dot-matrix LCD screen.

[0028] Optionally, the step of performing image analysis on the display detection image to generate a display detection result comprises:

[0029] performing image preprocessing on the display detection image to generate a noise-reduced detection image;

[0030] acquiring an image detection target of the display detection image;

[0031] determining whether the image detection target is a preset pattern detection target or a preset dot-matrix luminance detection target;

[0032] if the image detection target is the pattern detection target, performing contrast analysis on the noise-reduced detection image according to a preset standard pattern contrast method to generate a display pattern detection result;

[0033] if the image detection target is the dot-matrix luminance detection target, performing contrast analysis on the noise-reduced detection image according to a preset partitioned luminance contrast method to generate a display luminance detection result;

[0034] associating the display pattern detection result and the display luminance detection result to generate a display detection result.

[0035] Optionally, the step of performing contrast analysis on the noise-reduced detection image according to the preset standard pattern contrast method to generate a display pattern detection result comprises:

[0036] acquiring a pattern content type of the display detection image, and searching for a corresponding standard pattern image in a preset standard pattern content library according to the pattern content type;

[0037] mapping the noise-reduced detection image in the standard pattern image, and analyzing a difference image between the noise-reduced detection image and the standard pattern image to generate a defect area image;

[0038] calculating a defect pixel proportion according to the standard pattern image and the defect area image;

[0039] searching for a corresponding display pattern detection result in a preset defect proportion result relationship according to the defect pixel proportion.

[0040] Optionally, the step of performing contrast analysis on the noise-reduced detection image according to the preset partitioned luminance contrast method to generate a display luminance detection result comprises:

[0041] dividing the noise-reduced detection image according to a preset grid partition parameter to generate a dot-matrix area image and a corresponding dot-matrix area coordinate;

[0042] calculating an average gray value of the dot-matrix area image to generate a dot-matrix area luminance;

[0043] determining whether the dot-matrix area luminance is not less than a preset dot-matrix point lighting threshold value;

[0044] If less, then the preset dot matrix non-brightness result and dot matrix area coordinates are associated to generate a display brightness detection result.

[0045] If not less, then the preset display brightness normal result is defined as the display brightness detection result.

[0046] In a second aspect, the application provides a liquid crystal display detection system, which adopts the following technical solution:

[0047] A liquid crystal display detection system comprises:

[0048] A collection module is configured to collect a display detection trigger signal.

[0049] A memory is configured to store a program of the power terminal liquid crystal display detection method according to any one of the preceding aspects.

[0050] A processor, and the program in the memory can be loaded and executed by the processor and implement the power terminal liquid crystal display detection method according to any one of the preceding aspects.

[0051] In a third aspect, the application provides an intelligent terminal, which adopts the following technical solution:

[0052] An intelligent terminal comprises a memory and a processor, and the memory stores a computer program that can be loaded and executed by the processor and implement the power terminal liquid crystal display detection method according to any one of the preceding aspects.

[0053] In a fourth aspect, the application provides a computer storage medium, which can store a corresponding program and has the characteristics of facilitating the improvement of the display detection precision of a dot matrix liquid crystal display screen, and adopts the following technical solution:

[0054] A computer readable storage medium stores a computer program that can be loaded and executed by a processor and implement the power terminal liquid crystal display detection method according to any one of the preceding aspects.

[0055] In summary, the application has at least one of the following beneficial technical effects:

[0056] 1. The image collection component is aligned with the dot matrix liquid crystal display screen through the positioning component, thereby controlling the dot matrix liquid crystal display screen to display preset display detection parameters, and after the dot matrix liquid crystal display screen is photographed by the image collection component, a display detection image is obtained, and the display detection image is analyzed through image processing to obtain a display detection result, thereby enabling long-time uninterrupted display detection without visual fatigue and missed detection, and further improving the display detection precision of the dot matrix liquid crystal display screen.

[0057] 2. By controlling the positioning assembly to move the dot matrix liquid crystal display according to the active positioning parameter, and controlling the image acquisition assembly to move according to the acquisition positioning parameter, the center of the pattern on the dot matrix liquid crystal display and the center of the image acquisition assembly are on the same vertical line, the similarity of the image collected by the image acquisition assembly and the standard image in specification is ensured, the difficulty of subsequent image processing and analysis is reduced, and the accuracy of the display detection result is improved;

[0058] 3. By controlling the positioning assembly to synchronously flip the image acquisition assembly and the dot matrix liquid crystal display according to the use tilt angle and the angle flip direction, the dot matrix liquid crystal display displays the pattern under the use angle, and the image acquisition assembly collects the display image under the use state, thereby improving the accuracy of the dot matrix liquid crystal display detection. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 is a flowchart of a power terminal liquid crystal display detection method in an embodiment of the present application.

[0060] Figure 2 is a flowchart of a step in which the positioning assembly in an embodiment of the present application is preset to respond to a display detection trigger signal to align a preset image acquisition assembly to a dot matrix liquid crystal display.

[0061] Figure 3 is a flowchart of a step in which the positioning assembly in an embodiment of the present application is controlled to move the image acquisition assembly and the dot matrix liquid crystal display according to the active positioning parameter and the acquisition positioning parameter to align the image acquisition assembly to the dot matrix liquid crystal display.

[0062] Figure 4 is a flowchart of a step in which the positioning assembly in an embodiment of the present application is controlled to move the image acquisition assembly to align the image acquisition assembly to the dot matrix liquid crystal display in response to a horizontal alignment trigger signal.

[0063] Figure 5 is a flowchart of a step in which the display detection image is subjected to image analysis and processing to generate a display detection result in an embodiment of the present application.

[0064] Figure 6 is a flowchart of a step in which the noise reduction detection image is subjected to comparative analysis according to a preset standard pattern comparison method to generate a display pattern detection result in an embodiment of the present application.

[0065] Figure 7 is a flowchart of a step in which the noise reduction detection image is subjected to comparative analysis according to a preset partition brightness comparison method to generate a display brightness detection result in an embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will be combined with the drawings to further describe the present application.Figures 1 to 7 and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and should not be used in a limiting sense.

[0067] Referring to Figure 1 , the embodiment of the present application discloses a power terminal liquid crystal display detection method, comprising the following steps:

[0068] Step S100: Collecting display detection trigger signals of a preset dot matrix liquid crystal display screen.

[0069] Among them, the display detection trigger signal refers to the start signal of the display detection of the dot matrix liquid crystal display screen, which is sent to the processing terminal of the detection tool by the operator through the upper computer, and the processing terminal starts to detect the display of the dot matrix liquid crystal display screen after receiving the display detection trigger signal.

[0070] Step S101: The preset positioning assembly responds to the display detection trigger signal to align the preset image acquisition assembly to the dot matrix liquid crystal display screen.

[0071] Among them, after receiving the display detection trigger signal, the positioning assembly responds to the real-time detection trigger signal, so as to adjust the position of the image acquisition assembly and the dot matrix liquid crystal display screen, so that the image acquisition assembly is aligned with the dot matrix liquid crystal display screen, and the image acquisition assembly can shoot the best image of the dot matrix liquid crystal display screen. For specific method, refer to the step of Figure 2 .

[0072] The positioning assembly refers to a device for positioning the relative position of the image acquisition assembly and the dot matrix liquid crystal display screen, which adopts an aluminum alloy frame as a whole, and is provided with X-Y-Z axis slide rail module on the top for controlling the three-dimensional space position of the image acquisition assembly and the dot matrix liquid crystal display screen, and is provided with a servo motor for overturning the whole frame, so as to overturn the dot matrix liquid crystal display screen to different angles, simulate the actual use angle of the dot matrix liquid crystal display screen, and be closer to the actual situation, and improve the accuracy of detection.

[0073] The image acquisition assembly refers to a device for collecting the image of the dot matrix liquid crystal display, which includes an industrial camera, a four-way LED ring light source and a photosensitive component. The photosensitive component is used to transmit the backlight lighting data of the dot matrix liquid crystal display to the processing terminal, and at this time the processing terminal controls the four-way LED ring light source to assist the industrial camera to shoot the image of the dot matrix liquid crystal display screen.

[0074] Step S102: Controlling the preset dot matrix liquid crystal display screen to display preset display detection parameters, and controlling the image acquisition assembly to shoot the dot matrix liquid crystal display screen to generate a display detection image.

[0075] Wherein, after the image acquisition component is aligned with the dot matrix liquid crystal display screen, the processing terminal sends a display instruction to the dot matrix liquid crystal display screen according to the display detection parameter, so that the dot matrix liquid crystal display screen displays the corresponding image, at this time the processing terminal controls the image acquisition component to take a picture of the dot matrix liquid crystal display screen, so as to obtain the display detection image, which provides data support for subsequent analysis of whether the display of the dot matrix liquid crystal display screen is normal.

[0076] The display detection parameter refers to the pattern displayed on the display screen when detecting the display function of the dot matrix liquid crystal display screen, including Chinese, English, Arabic numerals, various power symbols and all dot matrix lighting, Chinese, English, Arabic numerals and various power symbols are used to assist in determining whether the dot matrix liquid crystal display screen has defects such as garbled code, no display, and screen flowers, and all dot matrix lighting is used to assist in determining whether the dot matrix of the dot matrix liquid crystal display screen has a partial non-lighting condition.

[0077] The display detection image refers to the image taken of the display of the dot matrix liquid crystal display screen, which is obtained by taking a picture of the dot matrix liquid crystal display screen when the corresponding pattern appears on the dot matrix liquid crystal display screen.

[0078] Step S103: performing image analysis processing on the display detection image to generate a display detection result, and uploading the display detection result to a preset host computer for storage.

[0079] Wherein, after obtaining the display detection image, the processing terminal performs image analysis processing on the pattern in the display detection image to obtain the display detection result, for specific methods, refer to the steps of Figure 5 , and upload the display detection result to the host computer for storage for subsequent calling.

[0080] The display detection result refers to the display detection result of the dot matrix liquid crystal display screen, including two kinds of normal display and abnormal display, and the abnormal display result further includes specific defects of the display, such as garbled code, no display, screen flowers or dot matrix non-lighting, which is obtained by the processing terminal analyzing the display detection image, for specific methods, refer to the steps of Figure 5 .

[0081] Referring to Figure 2 , the preset positioning component responds to the display detection trigger signal to align the preset image acquisition component with the dot matrix liquid crystal display screen, which includes:

[0082] Step S200: acquiring the center position of the current display pattern and the reset center position of the image acquisition component based on the display detection trigger signal.

[0083] Wherein, after receiving the display detection trigger signal, the detection tool starts to detect the dot matrix liquid crystal display, in the first step, the image acquisition component needs to be aligned with the dot matrix liquid crystal display, at this time, the current display pattern center position and the reset center position of the image acquisition component need to be collected first, so as to facilitate subsequent adjustment of the image acquisition component and the dot matrix liquid crystal display according to the current positions of the two, so that the center of the image acquisition component is aligned with the pattern center, and the quality of image acquisition is ensured.

[0084] The current display pattern center position refers to the center position of the display pattern on the dot matrix liquid crystal display. In order to detect the display situation at different positions on the dot matrix liquid crystal display, different display patterns are located at different positions on the dot matrix liquid crystal display, and the operator specifically corresponds the pattern to the position to form a mapping table, and the processing terminal finds the current display pattern center position in the mapping table according to the pattern parameter.

[0085] The reset center position refers to the center position of the image acquisition component. After the image acquisition component completes the shooting of a pattern, the image acquisition component is automatically reset to the position set by the operator, such as the center position of the moving area or the vertex position of the moving area, to facilitate subsequent movement of the image acquisition component again.

[0086] Step S201: Calculate the midpoint coordinates of the line connecting the current display pattern center position and the reset center position to generate the image acquisition position.

[0087] The image acquisition position refers to the position of the dot matrix liquid crystal display and the image acquisition component during image acquisition, which is obtained by the processing terminal calculating the midpoint coordinates of the line connecting the current display pattern center position and the reset center position. Specifically, the horizontal coordinates of the two are added and divided by 2, and the vertical coordinates are added and divided by 2, to obtain the midpoint coordinates of the line. By determining the image acquisition position, the dot matrix liquid crystal display and the image acquisition component can be moved by the same distance to be aligned, improving the efficiency of alignment.

[0088] Step S202: Determine the active positioning parameter according to the current display pattern center position and the image acquisition position.

[0089] The active positioning parameter refers to the parameter of the active movement of the dot matrix liquid crystal display, including the horizontal coordinate movement direction and distance, and the vertical coordinate movement direction and distance. The processing terminal calculates the difference between the horizontal and vertical coordinates of the current display pattern center position and the image acquisition position. The absolute value of the difference is the movement distance on the horizontal and vertical coordinate axes, and the positive and negative of the difference determines the movement direction. For example, if the difference is positive, move in the positive direction of the coordinate axis, and if the difference is negative, move in the negative direction of the coordinate axis. By determining the active positioning parameter, the dot matrix liquid crystal display is actively moved to align the image acquisition component, which improves the efficiency of alignment compared with the movement of the image acquisition component alone.

[0090] Step S203: determining the acquisition positioning parameter according to the reset center position and the acquisition image position.

[0091] The acquisition positioning parameter refers to the parameter of the active movement of the image acquisition component, including the horizontal coordinate movement direction and distance and the vertical coordinate movement direction and distance, and is obtained by the processing terminal after analyzing the reset center position and the acquisition image position. The specific analysis method is not described here. By determining the acquisition positioning parameter, the image acquisition component is actively moved to align the pattern, which improves the efficiency of alignment compared with the independent movement of the dot matrix liquid crystal display screen.

[0092] Step S204: controlling the positioning component to move the image acquisition component and the dot matrix liquid crystal display screen according to the active positioning parameter and the acquisition positioning parameter to align the image acquisition component with the dot matrix liquid crystal display screen.

[0093] After determining the active positioning parameter and the acquisition positioning parameter, the positioning component moves the dot matrix liquid crystal display screen with the active positioning parameter and moves the image acquisition component with the acquisition positioning parameter, so that the center of the image acquisition component aligns with the center of the pattern. For specific methods, refer to the steps of Figure 3 , which further ensures the quality of image acquisition.

[0094] Refer to Figure 3 , the step of controlling the positioning component to move the image acquisition component and the dot matrix liquid crystal display screen according to the active positioning parameter and the acquisition positioning parameter to align the image acquisition component with the dot matrix liquid crystal display screen includes:

[0095] Step S300: controlling the positioning component to move the image acquisition component and the dot matrix liquid crystal display screen according to the active positioning parameter and the acquisition positioning parameter, and acquiring the current display pattern type.

[0096] After determining the active positioning parameter and the acquisition positioning parameter, the positioning component moves the dot matrix liquid crystal display screen according to the active positioning parameter, moves the image acquisition component according to the acquisition positioning parameter, aligns the center of the image acquisition component with the center of the image, and detects the current display pattern type, which provides data support for subsequent adjustment of the distance between the image acquisition component and the pattern.

[0097] The current display pattern type refers to the pattern type displayed on the dot matrix liquid crystal display screen, which is determined by the processing terminal according to the display detection parameter. Different patterns have different sizes. A smaller pattern requires a closer shooting distance to ensure a clear image, while a larger pattern requires a farther shooting distance to ensure complete imaging. By determining the current display pattern type, data support is provided for subsequent determination of the specific shooting distance.

[0098] Step S301: According to the current display pattern type, find the corresponding acquisition distance parameter in the preset pattern acquisition parameter relationship.

[0099] The pattern acquisition parameter relationship refers to the corresponding relationship between different pattern types and acquisition image distances. An operator performs tests with different patterns, continuously adjusts the shooting distance, and defines the distance as the shooting distance of the pattern when the imaging is clear and complete under the determined shooting distance. The distance is correspondingly mapped to form a mapping table.

[0100] The acquisition distance parameter refers to the distance when the image of the pattern on the current dot matrix liquid crystal display is captured. The processing terminal finds it in the mapping table corresponding to the pattern acquisition parameter relationship according to the current display pattern type. By determining the acquisition distance parameter, the image acquisition component can acquire a complete and clear pattern image, which facilitates subsequent image analysis and processing.

[0101] Step S302: Acquire the horizontal alignment trigger signal.

[0102] The horizontal alignment trigger signal refers to the signal that the center of the image acquisition component aligns with the center of the pattern. The distance encoder on the positioning component outputs the horizontal alignment trigger signal after detecting that the moving distance is equal to the distance in the positioning parameter. The horizontal alignment trigger signal provides a specific time for the shooting distance adjustment of the image acquisition component in the vertical direction.

[0103] Step S303: The positioning component moves the image acquisition component by the acquisition distance parameter in response to the horizontal alignment trigger signal to align the image acquisition component with the dot matrix liquid crystal display.

[0104] After receiving the horizontal alignment trigger signal, the positioning component responds to the horizontal alignment trigger signal to control the image acquisition component to move by the acquisition distance parameter. For details, refer to the step of Figure 4 , so as to ensure that the image acquisition component can acquire a complete and clear pattern image.

[0105] Refer to Figure 4 , the step of the positioning component moving the image acquisition component by the acquisition distance parameter in response to the horizontal alignment trigger signal to align the image acquisition component with the dot matrix liquid crystal display comprises:

[0106] Step S400: The positioning component moves the image acquisition component by the acquisition distance parameter in response to the horizontal alignment trigger signal, and acquires the use inclination angle of the dot matrix liquid crystal display.

[0107] Wherein, after receiving the horizontal alignment trigger signal, the positioning assembly controls the image acquisition assembly to move in the vertical direction in response to the horizontal alignment trigger signal, and detects the moving distance of the image acquisition assembly, when the moving distance reaches the distance corresponding to the acquisition distance parameter, the positioning assembly controls the image acquisition assembly to stop, at this time, the image acquisition assembly can collect a complete and clear pattern image, and the use inclination angle of the dot matrix liquid crystal display screen is detected, providing data support for subsequent determination of the specific attitude of the dot matrix liquid crystal display screen during display detection.

[0108] The use inclination angle refers to the specific angle of the dot matrix liquid crystal display screen when it is used on the intelligent fusion terminal, which is obtained by inputting the terminal by the operator. By determining the use inclination angle, the dot matrix liquid crystal display screen displays the pattern at the angle, as close as possible to the actual use scenario, to ensure the accuracy of the detection.

[0109] Step S401: Collect the fixed orientation of the dot matrix liquid crystal display screen.

[0110] Wherein, the fixed orientation refers to the fixed orientation of the dot matrix liquid crystal display screen on the positioning assembly, including forward fixation and reverse fixation, the forward fixation refers to the bottom of the dot matrix liquid crystal display screen being below the positioning assembly, and the reverse fixation refers to the top of the dot matrix liquid crystal display screen being below the positioning assembly, by determining the fixed direction, data support is provided for subsequent determination of the specific direction of the dot matrix liquid crystal display screen.

[0111] Step S402: Determine the angle flip direction of the dot matrix liquid crystal display screen according to the fixed orientation.

[0112] Wherein, the angle flip direction refers to the direction of the dot matrix liquid crystal display screen, which is determined by the processing terminal according to the fixed orientation, if the fixed orientation is forward fixation, the flip direction is downward flip in the direction of the positioning assembly, if the fixed orientation is reverse fixation, the flip direction is upward flip in the direction of the positioning assembly, so that the dot matrix liquid crystal display screen is in the use attitude that the top is higher than the bottom, the detection environment of the dot matrix liquid crystal display screen is closer to the actual use environment, and the accuracy of the detection is improved.

[0113] Step S403: Control the positioning assembly to flip the image acquisition assembly and the dot matrix liquid crystal display screen synchronously according to the use inclination angle and the angle flip direction to align the image acquisition assembly with the dot matrix liquid crystal display screen.

[0114] Wherein, after determining the angle flipping direction, the processing terminal controls the positioning assembly to flip the image acquisition assembly and the dot matrix liquid crystal display synchronously in the angle flipping direction, so as to ensure that the detection environment of the dot matrix liquid crystal display is close to the use environment, and the image acquisition assembly is real-time aligned with the dot matrix liquid crystal display, and the angle of the dot matrix liquid crystal display is detected by the angle encoder in real time, and when the angle is equal to the use tilt angle, the positioning assembly is locked, so that the dot matrix liquid crystal display is kept at the use angle, and the image acquisition assembly is aligned with the dot matrix liquid crystal display.

[0115] Referring to Figure 5 The step of performing image analysis processing on the display detection image to generate a display detection result includes:

[0116] Step S500: image preprocessing is performed on the display detection image to generate a noise reduction detection image.

[0117] Wherein, after obtaining the display detection image, the processing terminal performs image preprocessing on the display detection image, so as to remove the light and noise interference during shooting, and obtain a noise reduction detection image, thereby providing a clear image for subsequent image recognition processing.

[0118] The noise reduction detection image refers to the image after preprocessing the display detection image. First, the display detection image needs to be grayed, the purpose is to simplify the data amount and retain the brightness information of the pixels, then a Gaussian filter is used to smooth the gray image to eliminate the electronic noise and environmental light interference during shooting, thereby reducing the probability of misjudging noise as defects during subsequent processing of the image, and finally a histogram equalization algorithm is used to adjust the brightness distribution of the image to solve the problem of uneven brightness of the image.

[0119] Step S501: image detection target of the display detection image is acquired.

[0120] Wherein, the image detection target refers to the function type of the dot matrix liquid crystal display detected by the image, including pattern display function and dot matrix brightness function, which is input into the processing terminal by the operator, and provides data support for subsequent image processing using specific algorithms by determining the image detection target.

[0121] Step S502: determining whether the image detection target is a preset pattern detection target or a preset dot matrix brightness detection target.

[0122] Wherein, the pattern detection target refers to detecting the pattern display function of the dot matrix liquid crystal display, and the dot matrix brightness detection target refers to detecting the dot matrix brightness of the dot matrix liquid crystal display, which is stored in the processing terminal by the operator.

[0123] The processing terminal judges whether the image detection target is a pattern detection target or a dot matrix brightness detection target, so as to determine how to process the image.

[0124] In step S5021, if the image detection target is a pattern detection target, the denoised detection image is compared and analyzed according to a preset standard pattern comparison method to generate a display pattern detection result.

[0125] If the processing terminal determines that the image detection target is a pattern detection target, it indicates that the pattern display function of the dot matrix liquid crystal display is mainly detected through the image, and therefore the denoised detection image is compared and analyzed according to the standard pattern comparison method to determine the display pattern detection result, thereby ensuring the accuracy of the image recognition algorithm.

[0126] The standard pattern comparison method refers to a method of comparing a detection image with a standard image to identify whether a display pattern in the detection image has defects, which is stored in the processing terminal by an operator, and the specific method is referred to the steps of Figure 6 .

[0127] The display pattern detection result refers to a detection result of the display pattern function of the dot matrix liquid crystal display screen, including a normal detection result and a detection result of having a garbled screen, random code or no display, which is obtained by the processing terminal after comparing and analyzing the denoised detection image according to the standard pattern comparison method, and the specific method is referred to the steps of Figure 6 .

[0128] In step S5022, if the image detection target is a dot matrix brightness detection target, the denoised detection image is compared and analyzed according to a preset partitioned brightness comparison method to generate a display brightness detection result.

[0129] If the processing terminal determines that the image detection target is a dot matrix brightness detection target, it indicates that the dot matrix brightness of the dot matrix liquid crystal display is mainly detected through the image, and therefore the denoised detection image is compared and analyzed according to the partitioned brightness comparison method to determine the display brightness detection result, thereby improving the accuracy of the image processing algorithm.

[0130] The partitioned brightness comparison method refers to a method of determining whether the dot matrix can be normally lit by recognizing the dot matrix brightness of the dot matrix liquid crystal display screen in the image, which is stored in the processing terminal by an operator, and the specific method is referred to the steps of Figure 7 .

[0131] The display brightness detection result refers to a detection result of the dot matrix lighting of the dot matrix liquid crystal display screen, which is obtained by the processing terminal after comparing and analyzing the denoised detection image according to the partitioned brightness comparison method, including that all dot matrices are normally lit or some specific position dot matrices cannot be normally lit, and the specific method is referred to the steps of Figure 7 .

[0132] Step S503: associate the display image detection result and the display brightness detection result to generate a display detection result.

[0133] In this step, the display detection result is consistent with the display detection result in step S103, and the display image detection result and the display brightness detection result are stored in the same data packet by the processing terminal.

[0134] Referring to Figure 6 According to the preset standard pattern comparison method, the step of comparing and analyzing the noise reduction detection image to generate a display pattern detection result includes:

[0135] Step S600: collect the pattern content type of the display detection image, and find the corresponding standard pattern image in the preset pattern content standard library according to the pattern content type.

[0136] The pattern content type refers to the content of the display pattern in the dot matrix liquid crystal display screen, which is determined by the processing terminal according to the display detection parameter, including Chinese, English, Arabic numerals, electronic symbols, etc. By determining the pattern display content, it is convenient to call the corresponding standard image for comparison with the detection image, and then determine whether the dot matrix liquid crystal display screen has display defects.

[0137] The pattern content standard library refers to the corresponding relationship between different pattern contents and standard pattern images. The operator displays a correct and defect-free pattern on the dot matrix liquid crystal display screen, then uses an industrial camera to shoot the pattern, and forms a standard pattern image after preprocessing, and then forms a mapping table by one-to-one correspondence between the pattern content and the standard pattern image.

[0138] The standard pattern image refers to the image of the dot matrix liquid crystal display screen when displaying a certain pattern without defects. The standard pattern image is found in the pattern content standard library by the processing terminal according to the pattern content type, which provides data support for subsequent comparison of whether the pattern display in the noise reduction detection image has defects.

[0139] Step S601: map the noise reduction detection image in the standard pattern image, and analyze the difference image between the noise reduction detection image and the standard pattern image to generate a defect area image.

[0140] Wherein, after calling the standard pattern image, the SIFT feature point matching algorithm is used to extract the feature points of the denoising detection image and the standard pattern image, such as pattern edges and corners, and then the Euclidean distance between the feature points of the two images is calculated by the Euclidean distance calculation formula, so as to screen out the mutually matched feature points, and finally the position and angle of the denoising detection image are adjusted by affine transformation, so as to map the denoising detection image in the standard pattern image, align the denoising detection image with the standard pattern image, and then perform difference operation on the denoising detection image and the standard pattern image, so as to obtain the defect area image, which provides data support for subsequent analysis of whether the denoising detection image has defects.

[0141] The defect area image refers to the area image where the denoising detection image and the standard pattern image are different. The difference between the gray values of different pixel coordinates in the denoising detection image and the standard pattern image is calculated by the processing terminal to obtain a difference image, and then the difference image is binarized. First, the gray threshold is determined. When the gray value of different pixel coordinates exceeds the gray threshold, it is determined that the pixel is a difference pixel of the two images, so the pixel is adjusted to white. When the gray value of different pixel coordinates does not exceed the gray threshold, it is determined that the pixel is the same pixel of the two images, so the pixel is adjusted to black.

[0142] Step S602: calculating the defect pixel ratio according to the standard pattern image and the defect area image.

[0143] The defect pixel ratio refers to the proportion of defect pixels in the standard pattern image. The number of white pixels in the defect area image is counted by the processing terminal, and then the quotient between the number of white pixels and the number of pixels of the standard pattern image is calculated to obtain the defect pixel ratio. By determining the defect pixel ratio, data support is provided for subsequent determination of the defect type of the dot matrix liquid crystal display.

[0144] Step S603: finding out the corresponding display pattern detection result in the preset defect ratio result relationship according to the defect pixel ratio.

[0145] The defect ratio result relationship refers to the corresponding relationship between different defect pixel ratios and defect results. For example, when the defect pixel ratio is equal to 0, because there is always a difference between the detection image and the standard image, it can be determined that the dot matrix liquid crystal display has no display defects. When the defect pixel ratio is less than 5%, it can be determined that the detection image and the standard image have no difference, and the dot matrix liquid crystal display has no display defects. When the defect pixel ratio is less than 70%, it can be determined that the dot matrix liquid crystal display has a garbled screen defect. When the defect pixel ratio is greater than 70%, it can be determined that the dot matrix liquid crystal display has a garbled code defect. The defect pixel ratio and the defect result are one-to-one corresponding to form a mapping table by the operator.

[0146] The display pattern detection result in this step is consistent with the display pattern detection result in step S5021, and is obtained by the processing terminal according to the defect pixel proportion in the defect proportion result relationship.

[0147] With reference to Figure 7 The step of performing contrast analysis on the noise reduction detection image according to the preset partition luminance contrast method to generate a display luminance detection result includes:

[0148] Step S700: Dividing the noise reduction detection image according to a preset grid partition parameter to generate a dot matrix area image and corresponding dot matrix area coordinates.

[0149] In a case where it is determined that the dot matrix luminance function of the dot matrix liquid crystal display needs to be detected through the noise reduction detection image, the noise reduction detection image is uniformly divided into dot matrix area images according to the grid partition parameter, and the dot matrix area coordinates of the corresponding images are recorded. In a case where it is subsequently determined that the dot matrix represented by the dot matrix area image cannot be lighted, the position of the dot matrix can be accurately marked for maintenance.

[0150] The grid partition parameter refers to a parameter for dividing the noise reduction detection image according to the dot matrix specification. For example, the dot matrix specification is 32 64 dot matrix, that is, there are 32 rows and 64 columns of dot matrix, so the grid partition parameter also needs to be consistent with the dot matrix specification, so as to divide the noise reduction detection image into areas with the same number of dot matrix, and ensure that there is only one dot matrix in each image.

[0151] The dot matrix area image refers to an image with only one dot matrix, which is obtained by uniformly dividing the noise reduction detection image by the processing terminal according to the grid partition parameter. The dot matrix area coordinates refer to the coordinates of different dot matrix images, which are obtained by the processing terminal by identifying the boundaries of the noise reduction detection image through an edge detection algorithm, thereby determining the coordinate range of the noise reduction detection image, and then identifying the accurate coordinates of the divided images in the coordinate range.

[0152] Step S701: Calculating the average gray value of the dot matrix area image to generate a dot matrix area luminance.

[0153] The dot matrix area luminance refers to a numerical value representing the luminance of the dot matrix, which is calculated by the processing terminal by traversing the gray values of all pixel points in the dot matrix area image, thereby calculating the total sum of the gray values of all pixels, then counting the total number of pixels, and finally calculating the quotient between the total sum of the gray values and the total number of pixels to determine the average gray value of the area image, so as to represent the luminance of the dot matrix by the average gray value.

[0154] Step S702: Determining whether the dot matrix area luminance is not less than a preset dot matrix lighting threshold.

[0155] The dot matrix lighting threshold refers to the average gray value in the region image when the dot matrix is normally lighted. The average gray value is obtained by an operator capturing an image of the normally lighted dot matrix and calculating the average gray value of the image.

[0156] The processing terminal determines whether the dot matrix region brightness is not less than the dot matrix lighting threshold, so as to determine whether the dot matrix can be normally lighted.

[0157] Step S7021: If less, the preset dot matrix non-lighting result is associated with the dot matrix region coordinates to generate a display brightness detection result.

[0158] If the processing terminal determines that the dot matrix region brightness is less than the dot matrix lighting threshold, it indicates that the brightness of the dot matrix region image is low, and the dot matrix cannot be normally lighted. Therefore, the dot matrix non-lighting result is associated with the dot matrix region coordinates to generate a display brightness detection result.

[0159] The dot matrix non-lighting result refers to a detection result that the dot matrix cannot be normally lighted, which is stored in the processing terminal by an operator.

[0160] Step S7022: If not less, the preset display brightness normal result is defined as the display brightness detection result.

[0161] If the processing terminal determines that the dot matrix region brightness is not less than the dot matrix lighting threshold, it indicates that the brightness of the dot matrix region image is high, and the dot matrix can be normally lighted. Therefore, the display brightness normal result is defined as the display brightness detection result.

[0162] The display brightness normal result refers to a detection result that the dot matrix can be normally lighted, which is stored in the processing terminal by an operator.

[0163] Based on the same inventive concept, the embodiment of the present application provides a liquid crystal display detection system, comprising:

[0164] The acquisition module is configured to acquire a display detection trigger signal, a current display pattern center position, a reset center position, a current display pattern type, a horizontal alignment trigger signal, a use tilt angle, a fixed direction, an image detection target, and a pattern content type.

[0165] The memory is configured to store a program of the power terminal liquid crystal display detection method.

[0166] The processor is configured to load and execute the program in the memory, and implement the power terminal liquid crystal display detection method.

[0167] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0168] The embodiment of the present application provides a computer readable storage medium, which stores a computer program capable of being loaded by a processor and executing a power terminal liquid crystal display detection method.

[0169] The computer storage medium includes, for example, a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program codes can be stored in the medium.

[0170] Based on the same inventive concept, the embodiment of the present application provides an intelligent terminal, which comprises a memory and a processor, and the memory stores a computer program capable of being loaded by the processor and executing a power terminal liquid crystal display detection method.

[0171] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0172] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, any feature disclosed in the specification (including the abstract and the drawings) can be replaced by other equivalent or similar purpose replacement features, unless specifically described. That is, unless specifically described, each feature is only an example of a series of equivalent or similar features.

Claims

1. A method of detecting a power terminal liquid crystal display, characterized by, The method comprises the following steps: acquiring a display detection trigger signal of a preset dot matrix liquid crystal display screen; a preset positioning assembly responds to the display detection trigger signal to align a preset image acquisition assembly to the dot matrix liquid crystal display screen; controlling the preset dot matrix liquid crystal display screen to display preset display detection parameters, and controlling the image acquisition assembly to take a picture of the dot matrix liquid crystal display screen to generate a display detection image; performing image analysis and processing on the display detection image to generate a display detection result, and uploading the display detection result to a preset host computer for storage; the step of performing image analysis and processing on the display detection image to generate the display detection result comprises: performing image preprocessing on the display detection image to generate a noise reduction detection image; acquiring an image detection target of the display detection image; judging whether the image detection target is a preset pattern detection target or a preset dot matrix brightness detection target; if it is the pattern detection target, performing comparative analysis on the noise reduction detection image according to a preset standard pattern comparison method to generate a display pattern detection result; if it is the dot matrix brightness detection target, performing comparative analysis on the noise reduction detection image according to a preset partition brightness comparison method to generate a display brightness detection result; associating the display image detection result and the display brightness detection result to generate the display detection result.

2. The method of claim 1, wherein the liquid crystal display is a power terminal liquid crystal display. The step of responding to the display detection trigger signal to align the preset image acquisition assembly to the dot matrix liquid crystal display screen comprises: acquiring a current display pattern center position and a reset center position of the image acquisition assembly based on the display detection trigger signal; calculating a midpoint coordinate of a line connecting the current display pattern center position and the reset center position to generate an image acquisition position; determining a positive positioning parameter according to the current display pattern center position and the image acquisition position; determining an acquisition positioning parameter according to the reset center position and the image acquisition position; controlling the positioning assembly to move the image acquisition assembly and the dot matrix liquid crystal display screen according to the positive positioning parameter and the acquisition positioning parameter to align the image acquisition assembly to the dot matrix liquid crystal display screen.

3. The method of claim 2, wherein the liquid crystal display is a twisted nematic liquid crystal display. The step of controlling the positioning assembly to move the image acquisition assembly and the dot matrix liquid crystal display screen according to the positive positioning parameter and the acquisition positioning parameter to align the image acquisition assembly to the dot matrix liquid crystal display screen comprises: controlling the positioning assembly to move the image acquisition assembly and the dot matrix liquid crystal display screen according to the positive positioning parameter and the acquisition positioning parameter, and acquiring a current display pattern type; finding out a corresponding acquisition distance parameter in a preset pattern acquisition parameter relationship according to the current display pattern type; acquiring a horizontal alignment trigger signal; the positioning assembly responds to the horizontal alignment trigger signal to move the image acquisition assembly by the acquisition distance parameter to align the image acquisition assembly to the dot matrix liquid crystal display screen.

4. The method of claim 3, wherein the liquid crystal display is a twisted nematic liquid crystal display. The step of the positioning assembly responding to the horizontal alignment trigger signal to move the image acquisition assembly by the acquisition distance parameter to align the image acquisition assembly to the dot matrix liquid crystal display screen comprises: the positioning assembly responds to the horizontal alignment trigger signal to move the image acquisition assembly by the acquisition distance parameter, and acquires a use inclination angle of the dot matrix liquid crystal display screen; acquiring a fixed orientation of the dot matrix liquid crystal display screen; determining an angle flipping direction of the dot matrix liquid crystal display screen according to the fixed orientation; According to the use of the tilt angle and the angle flip direction control positioning component synchronous flip image acquisition component and dot matrix liquid crystal display screen to make the image acquisition component align the dot matrix liquid crystal display screen.

5. The method of claim 1, wherein the liquid crystal display is a power terminal liquid crystal display. The step of comparing and analyzing the noise reduction detection image according to the preset standard pattern comparison method to generate the display pattern detection result includes: Acquiring the pattern content type of the display detection image, and searching for the corresponding standard pattern image in the preset pattern content standard library according to the pattern content type; Mapping the noise reduction detection image in the standard pattern image, and analyzing the difference image between the noise reduction detection image and the standard pattern image to generate a defect area image; According to the standard pattern image and the defect area image, the defect pixel proportion is calculated; According to the defect pixel proportion, the corresponding display pattern detection result is found in the preset defect proportion result relationship.

6. The method of claim 1, wherein the liquid crystal display is a power terminal liquid crystal display. The step of comparing and analyzing the noise reduction detection image according to the preset partition luminance comparison method to generate the display luminance detection result includes: According to the preset grid partition parameters, the noise reduction detection image is divided to generate the dot matrix area image and the corresponding dot matrix area coordinates; The average gray value of the dot matrix area image is calculated to generate the dot matrix area luminance; Determine whether the dot matrix area luminance is not less than the preset dot matrix light threshold value; If less, the preset dot matrix non-light result and the dot matrix area coordinates are associated to generate the display luminance detection result; If not less than, the preset display luminance normal result is defined as the display luminance detection result.

7. A liquid crystal display detection system, characterized by comprising: It includes: The acquisition module is used for acquiring the display detection trigger signal; The memory is used for storing the program of the power terminal liquid crystal display detection method in any one of claims 1 to 6; The processor, the program in the memory can be loaded and executed by the processor and realize the power terminal liquid crystal display detection method in any one of claims 1 to 6.

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