A vehicle-mounted screen body image quality weak defect detection device

Abstract

The utility model discloses a vehicle -mounted screen body picture quality weak defect detection device relates to screen product defect detection technical field. The vehicle -mounted screen body picture quality weak defect detection device includes: the placement plane is used for placing the screen of detection, wherein, the screen of detection has screen body twills, first shooting camera, first shooting camera is obliquely set up in one side of the screen of detection, and is arranged in the center vertical plane of screen body twill, and the center vertical plane indicates: the vertical plane that is perpendicular to any one of screen body twill and contains the center point of the screen of detection, or shooting component, the shooting component includes a plurality of side -by -side arrangement's second shooting camera, and a plurality of second shooting camera is obliquely set up in one side of the screen of detection, and is parallel to screen body twill. Through the technology that the utility model provides, can effectively avoid the imaging of screen body twill interference real weak defect.

Description

Technical Field

[0001] This utility model relates to the field of screen product defect detection technology, specifically to a device for detecting weak image quality defects in vehicle-mounted screens. Background Technology

[0002] Vehicle displays are generally automotive-grade LCD / LED / OLED type vehicle screen products. With their application in dashboards, central control screens and vehicle TVs, while pursuing high visual efficiency for various types of vehicle displays, the types and forms of weak defects in image quality are also increasing. Traditional weak defect detection devices rely on the imaging architecture of vertical and 30° side view images for detection. However, with the increase in the types and forms of weak defects, some types of weak defects cannot be detected smoothly, especially in diagonal stripe images, such as: (1) weak defects with large area and small gray level difference cannot be presented in the captured image in a normal environment, causing general detection equipment to miss detection; (2) diagonal stripe weak defects are affected by moiré patterns, making it difficult for general detection equipment to accurately image and detect them.

[0003] Based on this, the touchscreen defect detection device based on a line confocal camera disclosed in Chinese utility model patent document (CN209624417U) collects the coordinates, grayscale values, and height values ​​of various positions of the touchscreen under test and forms a one- or two-dimensional array; an image generation device generates a grayscale image and a height image of the touchscreen under test based on the two-dimensional array; an image processing device extracts defects and calculates their sizes from the grayscale and height images; and a data analysis device determines whether the touchscreen under test is qualified based on the number and size of defects. This method focuses on acquiring multiple images of the touchscreen under test at different positions, extracting a relatively complete display image through an algorithm, and then performing defect detection on the complete display image after algorithm integration. However, although this method improves detection accuracy, its complex data processing and the use of equipment such as a line confocal camera result in high detection costs. Utility Model Content

[0004] This invention provides a device for detecting weak image quality defects in vehicle-mounted screens, in order to solve the problem that diagonal stripe defects are difficult to be displayed in acquired images in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides a vehicle screen image quality defect detection device, which includes: a placement plane and a first shooting camera.

[0006] The placement plane is used to place the screen to be tested, wherein the screen to be tested has diagonal patterns on the screen body; the first camera is tilted and disposed on one side of the screen to be tested, and is positioned on the central vertical plane of the diagonal patterns on the screen body, wherein the central vertical plane is a vertical plane that is perpendicular to any diagonal pattern of the screen body and includes the center point of the screen to be tested.

[0007] Alternatively, the vehicle-mounted screen image quality defect detection device may include a placement plane and an imaging component. The placement plane is used to place the screen to be inspected, wherein the screen to be inspected has diagonal lines. The imaging component includes a plurality of second imaging cameras arranged side by side, which are tilted to one side of the screen to be inspected and parallel to the diagonal lines.

[0008] The beneficial effects of the technical solution provided by this utility model compared to the prior art are as follows: Because current camera sensor pixel arrays interfere with the regular diagonal stripe pattern of the screen under test, moiré patterns are easily generated. These pseudo-defects interfere with the identification of real weak defects (such as mura, bright spots, and dark spots). By using the specific camera deployment method described above, an imaging system consisting of a first camera or imaging component is built along the vertical extension direction of the diagonal stripe pattern of the screen under test, and the imaging system's field of view is aligned with the screen under test. This minimizes the interference of diagonal stripe defects on the image and allows real weak defects to be clearly imaged, enabling the acquisition of high-quality image data for the front-end process (image acquisition) of the computer detection algorithm.

[0009] In this method, the placement of a single first-capture camera and the parallel arrangement of multiple second-capture cameras, staggered by the diagonal pattern and spatial frequency relationship of the camera pixel array, ensures a clean background in the captured images and highlights weak defect features, significantly improving the accuracy and reliability of subsequent algorithm detection. Compared to sequentially acquiring multiple images from multiple angles for algorithmic compensation, this placement of the first or second cameras eliminates the need for complex post-processing, thus avoiding potential uncertainties during algorithm integration and reducing hardware and computational costs due to its simple placement.

[0010] In some implementations, the angle between the center of the field of view of the first camera or the imaging assembly and the perpendicular to any of the diagonal lines in the screen's twill pattern is between 48° and 78°. Within this deflection range, high compatibility with moiré patterns is exhibited, while ensuring a good field of view for the first or second camera. This provides a high-quality image foundation for subsequent defect identification.

[0011] Furthermore, the angle between the center of the field of view of the first camera or the shooting component and the perpendicular line of any of the diagonal lines in the screen's ripple pattern is 63°. Using the above technical solution, this angle is the "optimal angle" verified through extensive experiments, and it can adapt to the pixel arrangement patterns of various types of screens under test.

[0012] In some implementations, the field of view of the first camera is less than or equal to 25% of its wide side, and / or the field of view of the first camera is between 30% and 60% of its long side. By employing the above technical solution, within this range, it is possible to ensure that the change in the angle of light incidence across the entire field of view of the first camera is small, thereby reducing phenomena such as edge glare that may cause uneven brightness and further ensuring the quality of the captured image.

[0013] In some implementations, the vehicle-mounted screen image quality defect detection device includes a frame and a platform. The platform includes the placement plane. The frame is perpendicular to the platform and has a movably arranged camera clamping mechanism for clamping the first shooting camera.

[0014] By adopting the above technical solution, the camera is adjusted to determine a suitable shooting angle, and the platform includes a platform for horizontally placing the screen to be tested. That is, the first shooting camera is movable, while the screen to be tested is immovable, so as to maintain a better shooting posture to adapt to various models and sizes of screens to be tested.

[0015] In some implementations, the vehicle-mounted screen image quality defect detection device includes a frame, on which a screen clamping mechanism and a camera clamping mechanism are arranged sequentially along the vertical direction. The screen clamping mechanism is used to clamp the screen to be tested, and the camera clamping mechanism is used to clamp the first shooting camera.

[0016] By adopting the above technical solution, the adjustability of the first shooting camera and the screen to be tested is realized through the screen clamping mechanism and the camera clamping mechanism, thereby improving the diversity of captured images.

[0017] In some implementations, the vehicle-mounted screen image quality defect detection device further includes a third camera, which is tilted to one side of the screen to be tested and arranged on the fitting vertical plane formed by the extension line of the screen's diagonal pattern and the center point of the screen to be tested; wherein the third camera is in a slightly out-of-focus state.

[0018] Using the above technical solution, slight defocus refers to a small distance deviation between the camera's focal point and the surface of the object being inspected. This deviation is minimal and does not significantly affect image quality. Specifically, the aforementioned slight defocus state indicates the critical focus state at which the image captured by the first camera is about to display moiré patterns. In other words, in this slight defocus state, blurring can be used to some extent to avoid displaying moiré patterns while preserving sufficient defect details.

[0019] In some embodiments, the shooting assembly includes three second shooting cameras arranged side by side, wherein any one of the second shooting cameras is positioned on the central vertical plane of the screen body's twill.

[0020] Using the above technical solution, different exposures are required when the positions of multiple second cameras are different and the light sensitivity of the screen to be detected is different. In order to compensate for the possible overexposure or underexposure of the screen to be detected in the captured image, three second cameras are set up side by side to achieve full coverage detection.

[0021] In some embodiments, the first or second imaging camera includes an area scan camera and an FA lens. By employing the above technical solution, the optical imaging system constructed using an area scan camera and an FA lens can further improve image quality.

[0022] In some implementations, the testing environment for the vehicle-mounted screen image quality defect detection device is a darkroom environment. This technical solution eliminates interference from stray ambient light on the display of defects on the screen under test and from camera capture, ensuring that the light in the images captured by the first or second camera originates from the screen under test. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a layout diagram of an embodiment of a vehicle-mounted screen image quality defect detection device provided by this utility model. Figure 1 ; Figure 2 This is a layout diagram of an embodiment of a vehicle-mounted screen image quality defect detection device provided by this utility model. Figure 2 ; Figure 3 This is an image captured by the first camera of an embodiment of a vehicle-mounted screen image quality weak defect detection device provided by this utility model; Figure 4 This is a layout diagram of an embodiment of a vehicle-mounted screen image quality defect detection device provided by this utility model. Figure 3 ; Figure 5 This is an image captured by the third camera of an embodiment of a vehicle-mounted screen image quality weak defect detection device provided by this utility model; Figure 6 This is a schematic diagram of the structure of a frame for a vehicle-mounted screen image quality defect detection device provided by this utility model. Figure 1 ; Figure 7 This is a schematic diagram of the structure of a frame for a vehicle-mounted screen image quality defect detection device provided by this utility model. Figure 2 .

[0024] In the picture: 10. Placement plane; 11. Screen to be tested; 110. Screen body diagonal pattern; 20. First shooting camera; 21. Third shooting camera; 30. Shooting component; 31. Second shooting camera; 40. Frame; 41. Platform; 42. Camera clamping mechanism; 43. Screen body clamping mechanism. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] See Figures 1 to 2 As shown, Figure 1 This illustration shows a layout diagram of an embodiment of a vehicle-mounted screen image quality defect detection device provided in this application. Figure 1 ; Figure 2 This illustration shows a layout diagram of an embodiment of a vehicle-mounted screen image quality defect detection device provided in this application. Figure 2 .

[0027] In some implementation schemes, such as Figure 1 As shown, the vehicle-mounted screen image quality defect detection device includes: a placement plane 10 and a first camera 20. The placement plane 10 is used to place the screen 11 to be inspected, wherein the screen 11 to be inspected has screen body diagonal lines 110; the first camera 20 is obliquely disposed on one side of the screen 11 to be inspected and is arranged on the central vertical plane of the screen body diagonal lines 110, the central vertical plane being: a vertical plane perpendicular to any diagonal line of the screen body diagonal lines 110 and containing the center point of the screen 11 to be inspected.

[0028] In this embodiment, due to interference between the current camera sensor pixel array and the regular diagonal pattern of the screen 11 to be inspected, moiré patterns are easily generated. These pseudo-defects interfere with the identification of real weak defects (such as mura, bright spots, and dark spots). By constructing an imaging system consisting of a first capturing camera 20 along the perpendicular extension direction of the diagonal stripe 110 of the screen 11 to be inspected, and aligning the imaging system's field of view with the screen 11 to be inspected, the interference of diagonal stripe defects on the image can be minimized, and real weak defects can be clearly imaged, so as to obtain high-quality image data for the front-end process (image acquisition) of the computer detection algorithm. Exemplarily, the first capturing camera 20 includes an optical imaging system consisting of an area scan camera (an imaging device capable of capturing a two-dimensional image of the entire scene at once) and an FA lens, in order to further improve the image quality.

[0029] In another implementation, such as Figure 2 As shown, the vehicle-mounted screen image quality defect detection device includes a placement plane 10 and an imaging component 30. The placement plane 10 is used to place the screen 11 to be inspected, wherein the screen 11 to be inspected has screen body diagonal lines 110. The imaging component 30 includes a plurality of second imaging cameras 31 arranged side by side. The plurality of second imaging cameras 31 are tilted on one side of the screen 11 to be inspected and parallel to the screen body diagonal lines 110.

[0030] The arrangement of the single first capturing camera 20 and the parallel arrangement of multiple second capturing cameras 31, staggered by the diagonal pattern and spatial frequency relationship of the camera pixel array, results in a cleaner background in the acquired images and highlights weak defect features, significantly improving the accuracy and reliability of subsequent algorithm detection. Compared to the method of sequentially acquiring multiple images from multiple angles for algorithm compensation, the aforementioned arrangement of the first capturing camera 20 or the second capturing camera 31 does not require complex post-processing of images, thus avoiding uncertain errors that may arise during algorithm integration, and reducing hardware and computational costs based on simple arrangement conditions.

[0031] In some embodiments, the imaging component 30 includes three second imaging cameras 31 arranged side by side, wherein any one of the second imaging cameras 31 is positioned on the central vertical plane of the screen body's twill 110. In this embodiment, different exposures are required when the light sensitivity of the screen 11 to be detected varies based on the positions of the multiple second imaging cameras 31. To compensate for potential overexposure or underexposure of the screen 11 to be detected in the captured image, three second imaging cameras 31 are arranged side by side to achieve full coverage detection.

[0032] In one application scenario, the implementation steps include: (1) lighting up the grayscale image of the screen to be tested 11 (e.g., grayscale 96 image), and manually determining the shape and direction of the screen body diagonal stripe 110, wherein the screen body diagonal stripe 110 is an inherent variable defect of the screen to be tested 11; (2) determining the shooting angle of the first shooting camera 20 or shooting component 30, so that the angle between the field of view center of the first shooting camera 20 or shooting component 30 and the perpendicular line of any diagonal stripe in the screen body diagonal stripe 110 is between 48° and 78°; (3) adjusting the first shooting camera 20 or the third shooting camera 21 (hereinafter) to take multiple (e.g., 3) images of the screen to be tested 11 under different exposures; or the multiple cameras of the shooting component 30 take one image of the screen to be tested 11 under different exposures, wherein the focus state is focused. For example, the captured image can be as follows Figure 3 As shown, Figure 3 This image represents an embodiment captured by the first camera 20 of a vehicle-mounted screen image quality defect detection device provided in this application.

[0033] Wherein, the angle between the center of the field of view of the first shooting camera 20 or shooting component 30 and the perpendicular line of any of the diagonal lines in the screen body diagonal 110 is as follows: Figure 1 or Figure 2 As shown in α, within this deflection range, the first camera 20 and the second camera 31 can exhibit high compatibility with moiré patterns while ensuring the field of view. This effectively avoids interference from the screen's oblique patterns on real weak defects during imaging, and can subsequently be used as a labeled dataset to train existing software algorithms to improve the detection capability of weak defects.

[0034] For example, after extensive experimental verification, when the "optimal angle" of α is 63°, the aforementioned first shooting camera 20 and camera assembly can achieve the best shooting effect and adapt to the pixel arrangement patterns of various types of screens 11 to be tested.

[0035] In some implementations, the wide-side field of view of the first imaging camera 20 is less than or equal to 25%, and / or the long-side field of view of the first imaging camera 20 is 30% to 60%. In this embodiment, the wide-side field of view refers to the proportion of the imaging field of view in the Y direction under the XY plane, and the long-side field of view refers to the proportion of the imaging field of view in the X direction under the XY plane. Within this range, it can be ensured that the change in the light incident angle of the entire field of view of the first imaging camera 20 is small, so as to reduce phenomena such as edge glare that may cause uneven brightness, and further ensure the image quality after shooting.

[0036] Combination Figure 4 and Figure 5 As shown, Figure 4 This illustration shows a layout diagram of an embodiment of a vehicle-mounted screen image quality defect detection device provided in this application. Figure 3; Figure 5 This image represents an embodiment captured by the third camera 21 of a vehicle-mounted screen image quality defect detection device provided in this application.

[0037] In some implementations, the vehicle-mounted screen image quality defect detection device includes a placement plane 10 and a third camera 21. The third camera 21 is tilted and disposed on one side of the screen 11 to be inspected, and is arranged on the fitting vertical plane constructed by the extension line of the screen's diagonal ridge 110 and the center point of the screen 11 to be inspected; wherein, the focus state of the third camera 21 is a slightly out-of-focus state.

[0038] For example, when the third camera 21 is positioned on another vertical plane (i.e., the plane formed by the vertical line from the center point surface of the screen 11 to be inspected and the extension line of the screen's diagonal lines 110), and the focus state of the third camera 21 is adjusted to a slightly defocused state, it can avoid displaying moiré patterns to a certain extent through blurring processing, while retaining sufficient defect details. The captured image can be as follows: Figure 5 As shown.

[0039] Among them, micro-defocus refers to a certain distance deviation between the camera's focal position and the surface of the object being detected. This deviation is extremely small and does not significantly affect image quality. Specifically, the micro-defocus state can be described as the critical focus state at which moiré patterns are about to appear in the image captured by the third camera 21 when it captures the image of the screen 11 to be detected.

[0040] In some implementations, the testing environment for the vehicle-mounted screen image quality defect detection device is a darkroom environment. In this embodiment, to eliminate interference from ambient stray light on the display of defects on the screen 11 to be tested and camera capture, it is ensured that the light in the image captured by the first camera 20 or the second camera 31 originates from the screen 11 to be tested.

[0041] Combination Figure 6 As shown, Figure 6 This application provides a schematic diagram illustrating the structure of a frame 40 of an embodiment of a vehicle-mounted screen image quality defect detection device. Figure 1 In some implementations, the vehicle-mounted screen image quality defect detection device includes a frame 40 and a platform 41. The platform 41 includes a placement plane 10. The frame 40 is perpendicular to the platform 41 and is movably equipped with a camera clamping mechanism 42 for clamping a first shooting camera 20.

[0042] In this embodiment, the camera is adjusted dynamically to determine a suitable shooting angle, and the stage 41 includes a platform for horizontally placing the screen 11 to be tested, i.e. Figure 6As shown, the first shooting camera 20 is movable, while the screen to be tested 11 is placed in a plane and is immovable, so as to maintain a better shooting posture to adapt to various models and sizes of screens to be tested 11. For example, the camera clamping mechanism 42 can be fixed to the column of the frame 40 by bolt locking.

[0043] Combination Figure 7 As shown, Figure 7 This application provides a schematic diagram illustrating the structure of a frame 40 of an embodiment of a vehicle-mounted screen image quality defect detection device. Figure 2 In some implementations, the vehicle-mounted screen image quality defect detection device includes a frame 40, on which a screen clamping mechanism 43 and a camera clamping mechanism 42 are arranged sequentially along the vertical direction. The screen clamping mechanism 43 is used to clamp the screen 11 to be tested, and the camera clamping mechanism 42 is used to clamp the first shooting camera 20.

[0044] In this embodiment, the adjustability of the first capturing camera 20 and the screen to be tested 11 is achieved through the screen clamping mechanism 43 and the camera clamping mechanism 42, thereby improving the diversity of captured images. For example, the camera clamping mechanism 42 and the screen clamping mechanism 43 can be fixed to the column of the frame 40 by bolts, and the screen clamping mechanism 43 can be a clamp that can be adjusted to rotate around itself.

[0045] It is worth noting that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0046] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, should be included within the protection scope of this utility model.

Claims

1. A device for detecting weak image quality defects in vehicle-mounted screens, characterized in that, include: A placement plane is used to place the screen to be tested, wherein the screen to be tested has diagonal stripes on the screen body; A first camera is tilted and positioned on one side of the screen to be tested, and is arranged on the central vertical plane of the diagonal pattern of the screen body. The central vertical plane is defined as a vertical plane that is perpendicular to any diagonal pattern of the screen body and includes the center point of the screen to be tested. or The shooting component includes a plurality of second shooting cameras arranged side by side, the plurality of second shooting cameras being tilted on one side of the screen to be tested and parallel to the diagonal lines of the screen body.

2. The device for detecting quality defects of a vehicle-mounted screen body according to claim 1, characterized in that, The angle between the center of the field of view of the first camera or the shooting component and the perpendicular line of any of the diagonal lines in the screen body is 48° to 78°.

3. The vehicle-mounted screen image quality defect detection device according to claim 2, characterized in that, The angle between the center of the field of view of the first camera or the shooting component and the perpendicular line of any of the diagonal lines in the screen body is 63°.

4. The device for detecting quality defects of a vehicle-mounted screen body according to claim 1, characterized in that, The first camera's wide-side field of view is less than or equal to 25%, and / or the first camera's long-side field of view is between 30% and 60%.

5. The vehicle-mounted screen image quality weak defect detection device according to any one of claims 1 to 4, characterized in that, The vehicle-mounted screen image quality defect detection device includes a frame and a platform. The platform includes a placement plane. The frame is perpendicular to the platform and has a movably arranged camera clamping mechanism for clamping the first shooting camera.

6. The vehicle-mounted screen image quality weak defect detection device according to any one of claims 1 to 4, characterized in that, The vehicle-mounted screen image quality defect detection device includes a frame, on which a screen clamping mechanism and a camera clamping mechanism are arranged sequentially along the vertical direction. The screen clamping mechanism is used to clamp the screen to be tested, and the camera clamping mechanism is used to clamp the first shooting camera.

7. The vehicle-mounted screen image quality defect detection device according to claim 1, characterized in that, The vehicle-mounted screen image quality defect detection device includes the placement plane and a third camera. The third camera is tilted on one side of the screen to be tested and is arranged on the fitting vertical plane constructed by the extension line of the screen's diagonal pattern and the center point of the screen to be tested. The third camera is in a slightly out-of-focus state.

8. The device for detecting quality defects of a vehicle-mounted screen body according to claim 1, characterized in that, The shooting assembly includes three second shooting cameras arranged side by side, wherein any one of the second shooting cameras is positioned on the central vertical plane of the screen body's twill.

9. The vehicle-mounted screen image quality weak defect detection device according to claim 1 or 8, characterized in that, The first or second camera includes an area scan camera and an FA lens.

10. The vehicle-mounted screen image quality defect detection device according to claim 1, characterized in that, The testing environment for the vehicle-mounted screen image quality defect detection device is a darkroom environment.

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