Plane defect detection system and method for single or multiple N-division optical reflection modules

Abstract

The invention discloses a plane defect detection system and method for single or multiple N-beam optical reflection modules, and aims to solve the problems of limited detection angle and low coverage rate in the prior art. The system comprises, for example, an N-division optical reflection module, the N-division optical reflection module comprises N optical reflection elements, an observation plane surrounding 360 degrees or a specific direction range is formed, 360-degree omnibearing observation is achieved at a 60-degree inclined observation angle, and it is ensured that all reflection images face the same direction. The imaging device captures multi-angle images, and various defects such as scratches and scratches are detected and recognized through the image processing unit. By accurately controlling the position and orientation of the optical reflection module, the system realizes multi-angle and high-precision detection, the detection coverage rate and accuracy are remarkably improved, and missing detection and false detection are reduced. Meanwhile, according to the system, the number of cameras is reduced, and cost and complexity are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial product plane detection, and in particular to a plane defect detection system and method of a single or multiple N-spectral optical reflection modules. Background Art

[0002] In modern industrial production, defect detection of product surfaces is one of the important links to ensure product quality. Especially in the fields of electronic product manufacturing, glass processing, and metal sheets, the quality of the product surface directly affects its performance and market competitiveness.

[0003] Currently, plane defect detection mainly relies on automatic optical inspection (AOI) systems. These systems usually use cameras with fixed angles and directions to take pictures and analyze the surface of the object being inspected. However, traditional AOI systems have significant deficiencies when it comes to plane surface defect detection. Since defects on planes (such as scratches, abrasions, pits, bulges, dirt, etc.) are directional and angular, many defects can only be detected at specific tilted viewing angles and viewing directions. Fixed-angle detection methods often fail to fully and effectively capture these defects, resulting in frequent missed detections and false detections.

[0004] For example, in products such as mobile phone glass cover plates, tablet computer cover plates, computer display cover plates, and laptop computer shells, the surface is often required to be highly smooth and free of any defects. However, tiny scratches or abrasions on a flat surface may only be visible at a certain angle. Fixed-angle inspection systems may not be able to detect these defects, resulting in unqualified products entering the market.

[0005] In order to meet these challenges, some inspection systems using multi-angle imaging have emerged in recent years. These systems usually use multiple cameras to shoot the surface of the inspected object from different directions to improve the inspection coverage. However, this method requires a large number of camera devices, the system is complex and costly, and it is difficult to promote and apply in large-scale industrial production.

[0006] Therefore, how to achieve comprehensive and efficient detection of surface defects of planar objects without increasing system complexity and cost has become a technical problem to be solved by the present invention. Summary of the invention

[0007] The technical problem solved by the present invention is to provide a planar defect detection system and method of a single or multiple N-spectral optical reflection modules in response to the defects existing in the above-mentioned prior art, so as to solve the problem that it is difficult to comprehensively and efficiently detect planar surface defects raised in the above-mentioned background technology.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0009] A planar defect detection system of a single or multiple N-spectral optical reflection modules, comprising:

[0010] One or more optical reflection modules, each module including at least one optical reflection element, for imaging the detected planar object at one or more inclined observation angles;

[0011] An imaging device, used to capture an image of a planar object reflected by the optical reflection module;

[0012] The image processing unit is used to analyze the image captured by the imaging device and detect defects on the surface of the planar object.

[0013] As a further solution of the present invention, the planar defect detection system of the single or multiple N-split optical reflection modules also includes a reflection element, and the optical reflection module covers different observation directions at the same inclined observation angle through the reflection element to realize imaging of the detected planar object at one or more inclined observation angles.

[0014] As a further solution of the present invention, the image processing unit includes one or more automatic optical detection modules for detecting defects on the surface of a planar object, including but not limited to scratches, abrasions, pits, bulges, and dirt.

[0015] As a further solution of the present invention, the optical reflection module includes multiple optical reflection elements installed in different directions, the angles of N reflection elements in an optical reflection module relative to the horizontal plane are the same, and each reflection element covers a different observation direction within a 360-degree range or a specific direction range; the angles of the reflection elements in different optical reflection modules relative to the horizontal plane may be the same or different, corresponding to the same or different inclined observation angles, and the inclined observation angles include but are not limited to the range of 10 degrees to 85 degrees.

[0016] As a further solution of the present invention, the optical reflection module includes multiple reflection elements, including but not limited to eight reflection elements. These reflection elements are combined to simulate the observation direction of 360 degrees or a specific direction range. The images reflected by the reflection elements are all facing the same direction to facilitate imaging by the imaging device.

[0017] As a further solution of the present invention, the optical reflection module simulates observing the detected planar object from different directions at the same inclined observation angle by installing optical reflection elements facing different directions. The inclined observation angles are the same or different in different optical reflection modules and the same in the same optical reflection module, and secondary imaging is performed after reflection.

[0018] As a further solution of the present invention, the system ensures that all reflected images are facing the same direction, including horizontal imaging, direct imaging and indirect imaging, so as to improve the detection accuracy.

[0019] A planar defect detection method based on a single or multiple N-spectral optical reflection modules, comprising:

[0020] Step 1: One or more optical reflection modules are provided to perform single or multiple tilted observation angle imaging on the detected planar object; each optical reflection module includes at least one optical reflection element, which is used to perform 360-degree all-round or specific direction range observation or imaging on the detected planar object at a certain tilted observation angle;

[0021] Step 2: using an imaging device to capture an image of a planar object reflected by the optical reflection module;

[0022] Step 3: Use an image processing unit to analyze the image captured by the imaging device to detect defects on the surface of the planar object.

[0023] As a further scheme of the present invention, step 1 further includes setting one or more optical reflective elements to form an observation plane surrounding 360 degrees or a specific direction range; reflective elements with different or the same angles to the horizontal plane are set in different optical reflective modules, so that different optical reflective modules can image or observe the detected planar object within 360 degrees or a specific direction range at an inclined observation angle including but not limited to 20 degrees, 40 degrees, and 60 degrees; step 2 further includes using multiple reflective elements, including but not limited to eight reflective elements, to achieve imaging of the detected planar object within 360 degrees or a specific direction range, and the images reflected by the reflective elements are all facing the same direction to facilitate imaging by the imaging device; step 3 further includes performing multi-angle observation through optical reflective elements in different directions at the same inclined observation angle, the inclined observation angles are the same or different in different optical reflective modules, and the same in the same optical reflective module, and secondary imaging is performed through reflection.

[0024] As a further scheme of the present invention, the scope of application of the method includes but is not limited to mobile phone glass cover plates, tablet computer glass cover plates, computer display screen cover plates, laptop computer display screen cover plates, mobile phone display screens, computer display screens, tablet computer display screens, watch display screens, bracelet display screens, mobile phone and tablet computer back covers or protective shells, laptop computer shells, tablet computer shells, mobile phone shells, watch shells, and bracelet shells; wherein the laptop computer shell includes an ACD panel; and, the method is also applicable to surfaces of smooth materials, and the smooth material surfaces include but are not limited to metal or non-metallic film materials, thin films, glass, metal surfaces, and ceramic surfaces; and the method is also applicable to smooth surface detection of special materials, cloth, paper, and fiber.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. All-round and multi-angle detection: Traditional defect detection systems are usually limited to fixed-angle observation and cannot fully cover the surface defects of the inspected object. The present invention configures more than one optical reflective element to form an observation plane surrounding 360 degrees or a specific direction range, so that the optical reflective element can observe the inspected object in all directions. This design greatly increases the coverage of the detection and can effectively capture all possible surface defects in different directions.

[0027] 2. Cost-effectiveness: Compared with the traditional multi-angle imaging system that requires a large number of camera devices, the present invention greatly reduces the number of cameras used through the innovative design of optical reflective elements, reducing the complexity and cost of the system. While maintaining high-precision detection, a more economical and efficient solution is achieved, which has high practical value and promotion potential.

[0028] 3. Wide application scope: The present invention is applicable to the plane defect detection of various industrial products, including but not limited to mobile phone glass cover plates, tablet computer cover plates, computer display cover plates, notebook computer shells, etc. Whether it is glass, metal plates, or smooth surfaces of other materials, the present invention can efficiently detect surface defects and has a wide range of industrial application prospects.

[0029] 4. Innovative multi-angle imaging: The present invention realizes multi-angle imaging by setting multiple modules or adjusting the height of the optical reflection module and the angle of the reflection element. Observation at different tilt angles can effectively capture defects that can only be seen at a specific tilt observation angle and / or in a specific observation direction, significantly improving the comprehensiveness and accuracy of detection. This innovative multi-angle imaging method overcomes the limitations of fixed-angle imaging in the prior art.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] Figure 2 It is a structural schematic diagram of the cylinder mounting seat.

[0034] Figure 3 for Figure 2 Schematic diagram of the position structure of the optical reflective element column.

[0035] Figure 4 for Figure 2 Schematic diagram of the position structure of the reflective element.

[0036] Figure 5 Schematic diagram of the coverage viewing direction of a single reflective element x.

[0037] Figure 6 Schematic diagram of the light path at an oblique observation angle.

[0038] The reference numerals and names in the figures are as follows:

[0039] Optical reflection module 1, optical reflection element column 2, imaging device 3, control unit 4, X-axis displacement mechanism 5, Y-axis displacement mechanism 6, reflection element 8, cylinder mounting seat 9, bracket 12, fill light 16, object to be detected 17, plane 18, inclined observation angle 19 and light 20. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1—6. In an embodiment of the present invention, a plane defect detection system of a single or multiple N-split optical reflection modules includes: one or more optical reflection modules 1, each module including at least one optical reflection element 8, which is used to perform imaging of the plane object to be detected at one or more inclined observation angles; an imaging device 3, which is used to capture the image of the plane object reflected by the optical reflection module 1; a control unit 4, which is used to adjust the relative position of the optical reflection module and the plane to be measured, wherein this position includes but is not limited to height, left and right direction, front and rear inclined observation angles and observation direction, so as to achieve multi-angle and multi-directional observation; the control unit 4 includes an X-axis displacement mechanism 5 and a Y-axis displacement mechanism 6, which are used to adjust the relative position of the optical reflection module and the plane to be measured; a fill light 16 can be fixedly arranged on the circumference centered on the imaging device 3 by a bracket to achieve a better light 20 reflection use effect, which are all extended implementation methods that can be known to ordinary technicians in this field.

[0042] During operation, the position and orientation of the optical reflection module 1 relative to the plane object to be detected is adjusted by the control unit 4 so that the cylinder mounting seat 9 is located above the plane 18 of the object to be detected 17. Figure 1 The plane on the upper surface of the notebook shell is reflected from multiple directions by densely arranged reflective elements 8 around the optical reflective element column 2, and is imaged by the optical reflective module 1 on the optical reflective element column 2, and is captured and photographed by the imaging device 3 in different detection and observation directions to achieve multi-directional detection of the plane.

[0043] The optical reflection module includes a plurality of optical reflection elements installed in different directions. The angles of the N reflection elements in one optical reflection module relative to the horizontal plane are the same, and each reflection element covers a different observation direction within a 360-degree range or a specific direction range; the angles of the reflection elements in different optical reflection modules relative to the horizontal plane may be the same or different, corresponding to the same or different inclined observation angles, and the inclined observation angles include but are not limited to the range of 10 degrees to 85 degrees; wherein, Figure 5 It is a schematic diagram of the coverage of the observation direction of a single reflective element x. The eight solid lines in the center of the figure represent eight reflective units 8, x is one of the reflective units, and the angular dotted line on x represents the observation direction range covered by x, and the circular dotted line represents a 360-degree observation direction.

[0044] The image processing unit can be, for example, an industrial host computer, and the imaging device 3 transmits the image to the image processing unit for analyzing the image captured by the imaging device 3 and detecting defects on the surface of the planar object. Specifically, the image processing unit includes an automatic optical inspection (AOI) module, which is based on image recognition and processing technology and can accurately identify and locate various surface defects, including but not limited to scratches, abrasions, pits, bulges, and dirt. The image processing unit analyzes and processes the image through advanced algorithms, comprehensively judges the surface defects from multiple angles, and ensures high-precision and high-efficiency detection results. The application of the image processing unit significantly improves the detection coverage, reduces the possibility of missed detection and false detection, and ensures the stability and reliability of product quality.

[0045] The plane defect detection system of the single or multiple N-division optical reflection modules also includes a reflection element 8. The optical reflection module 1 covers different observation directions at the same inclined observation angle 19 through the reflection element 8 to realize imaging of the plane object to be detected at one or more inclined observation angles. The present invention realizes all-round and multi-angle imaging of the plane object to be detected. Compared with the traditional system that only images from a fixed angle, the present invention realizes the reflection characteristics of the plane object under different lighting and angles, ensuring that more comprehensive surface details are captured.

[0046] The number of the reflective elements 8 is N. The image processing unit includes one or more automatic optical detection modules for detecting defects on the surface of a planar object, including but not limited to scratches, abrasions, pits, bulges, and dirt.

[0047] As a further solution of the present invention, the optical reflection module includes a plurality of optical reflection elements installed in different directions to cover different observation directions.

[0048] As a further solution of the present invention, the optical reflection module includes multiple reflection elements, including but not limited to eight reflection elements. These reflection elements are combined to simulate the observation direction of 360 degrees or a specific direction range. The images reflected by the reflection elements are all facing the same direction to facilitate imaging by the imaging device.

[0049] As a further solution of the present invention, the optical reflection module simulates observing the detected planar object from different directions at the same inclined observation angle by installing optical reflection elements facing different directions. The inclined observation angles are the same or different in different optical reflection modules and the same in the same optical reflection module, and secondary imaging is performed after reflection.

[0050] As a further solution of the present invention, the system ensures that all reflected images are facing the same direction, including horizontal imaging, direct imaging and indirect imaging, so as to improve the detection accuracy.

[0051] A planar defect detection method based on a single or multiple N-spectral optical reflection modules, comprising:

[0052] Step 1: One or more optical reflection modules are provided to perform single or multiple tilted observation angle imaging on the detected planar object; each optical reflection module includes at least one optical reflection element, which is used to perform 360-degree all-round or specific direction range observation or imaging on the detected planar object at a certain tilted observation angle;

[0053] Step 2: using the imaging device 3 to capture the image of the planar object reflected by the optical reflection module 1;

[0054] Step 3: adjusting the position and orientation of the optical reflection module 1 relative to the detected plane object through the control unit 4 to achieve multi-angle and multi-directional observation of the detected plane object;

[0055] Step 4: Use the image processing unit to analyze the image captured by the imaging device 3 to detect defects on the surface of the planar object.

[0056] Step 1 further includes changing the observation angle of the optical reflection module 1 through one or more reflection devices to achieve imaging of the detected planar object at one or more inclined observation angles.

[0057] As a further solution of the present invention, step 1 further includes changing the observation angle of the optical reflection module through one or more reflection devices to achieve imaging of the detected planar object at one or more inclined observation angles.

[0058] The scope of application of the method includes but is not limited to mobile phone glass cover plates, tablet computer glass cover plates, computer display screen cover plates, laptop computer display screen cover plates, mobile phone display screens, computer display screens, tablet computer display screens, watch display screens, bracelet display screens, mobile phone and tablet computer back covers or protective shells, laptop computer shells, tablet computer shells, mobile phone shells, watch shells, and bracelet shells; wherein the laptop computer shell includes an ACD panel; and the method is also applicable to surfaces of smooth materials, and the smooth material surfaces include but are not limited to metal or non-metallic film materials, thin films, glass, metal surfaces, and ceramic surfaces; and the method is also applicable to smooth surface detection of special material fabrics, paper, and fibers.

[0059] As a further scheme of the present invention, step 2 further includes using multiple reflective elements, including but not limited to eight reflective elements, to achieve imaging of the plane object to be detected within 360 degrees or a specific direction range, and the images reflected by the reflective elements are all facing the same direction to facilitate imaging by the imaging device; step 3 further includes performing multi-angle observation through optical reflective elements in different directions at the same inclined observation angle, and the inclined observation angles are the same or different in different optical reflection modules and the same in the same optical reflection module, and secondary imaging is performed through reflection; step 4 further includes ensuring that all imaging is facing the same direction, including horizontal imaging, direct imaging and indirect imaging, to improve detection accuracy.

[0060] In the present invention:

[0061] An optical reflective element is understood to be a single mirror.

[0062] An optical reflection module may contain N reflective optical reflection elements, and an optical reflection module containing N reflective elements is called an N-part optical reflection module.

[0063] One optical reflection module corresponds to one "tilted viewing angle". Different modules correspond to different tilted viewing angles, such as 30 degrees and 60 degrees.

[0064] The "oblique viewing angle" refers to the angle between the line of sight and the observed plane.

[0065] The N reflective elements in a module have the same angle relative to the horizontal plane, and each reflective element covers a different "observation direction" within a 360-degree range.

[0066] The “observation direction” refers to a rotation around the normal of the observed plane at the same oblique observation angle, that is, 360 degrees.

[0067] Also, the angles of the reflective elements in different modules relative to the horizontal plane may be different, mainly to correspond to different oblique viewing angles. The angles of the N reflective elements in one module relative to the horizontal plane are the same.

[0068] The "components" in the module are fixed after installation and cannot be adjusted. In order to achieve different "tilted viewing angles", it is mainly achieved by adjusting the overall height of the "module" or setting up multiple modules, which are all extended implementation methods known to ordinary technicians in this field.

[0069] Embodiment 1:

[0070] In the manufacturing process of electronic products, especially in the production of mobile phone glass cover plates, tablet computer cover plates and other products, defect detection on flat surfaces is one of the key steps to ensure product quality. Due to the limitation of fixed angles, traditional automatic optical inspection (AOI) systems are difficult to fully capture surface defects and are prone to missed detection and false detection. Therefore, we use a flat defect detection system with a single or multiple N-division optical reflection modules to solve this problem.

[0071] The system includes an optical reflection module 1, an imaging device 3, a control unit 4 and an image processing unit. The optical reflection module 1 is composed of a plurality of optical reflection elements, which are installed in a barrel mounting seat 9 and fixed at the bottom opening position by a bracket 12. The optical reflection module 1 can image the surface of a planar object from different oblique viewing angles and viewing directions by adjusting its height and angle, thus overcoming the fixed angle limitation of the traditional AOI system.

[0072] In practical applications, taking the glass cover of a mobile phone as an example, there may be tiny defects such as scratches, abrasions, and pits on the surface of the glass cover, and these defects have different reflection characteristics at different viewing angles and directions. Through the multi-angle imaging capability of this system, the surface can be observed from multiple directions to ensure that all defects are captured as much as possible.

[0073] During the specific implementation process, the glass cover to be detected is first placed on the detection platform. The control unit 4 adjusts the position and orientation of the optical reflection module 1 relative to the plane to be detected so that the optical reflection module 1 is aligned with the area to be detected. The imaging device 3 (such as multiple cameras) captures the images reflected by the optical reflection module 1, and these images cover all directions of the surface of the glass cover. In addition, the control unit 4 includes an X-axis displacement mechanism 5 and a Y-axis displacement mechanism 6. The control unit 4 can adopt methods such as PID control algorithms or path planning algorithms in the prior art to achieve multi-axis displacement through multiple motor drives. At the same time, the control unit 4 uses these algorithms to control the motor to achieve the movement of the optical reflection module 1 in the X and Y directions relative to the plane to be detected, and in the extended implementation mode, it can also have Z-direction movement, which are all extended implementation modes known to ordinary technicians in this field.

[0074] The captured images are transmitted to the image processing unit for defect analysis. The image processing unit contains an automatic optical inspection module that can accurately identify and locate a variety of defects including scratches, abrasions, pits, bulges, and dirt. Multi-angle image processing not only improves the coverage of defect detection, but also reduces the possibility of missed detection and false detection.

[0075] In order to further improve the applicability of the system, the optical reflection module 1 is also equipped with a reflection element 8, through which the flat object can be imaged in a wider range of observation directions. The design of the barrel mount 9 ensures the stability and adjustability of the system, so that the system can be flexibly applied in different production environments.

[0076] It can be seen from the above embodiments that the plane defect detection system of a single or multiple N-split optical reflection modules can achieve comprehensive and efficient detection of surface defects of planar objects without increasing system complexity and cost. The system has important application value in the manufacturing process of high-requirement products such as mobile phone glass cover plates and tablet computer cover plates.

[0077] Embodiment 2:

[0078] In modern industrial production, detecting planar defects of various materials is crucial for product quality control. Especially in the fields of mobile phone glass cover, tablet cover, computer display cover, laptop shell, etc., the requirements for surface flatness and flawlessness are extremely high. Due to the fixed angle limitation, the existing automatic optical inspection (AOI) system is difficult to fully capture surface defects, and is prone to missed detection and false detection problems. To address this problem, we propose a planar defect detection system with a single or multiple N-split optical reflection modules, which can efficiently and comprehensively detect various types of planar defects.

[0079] The system includes a plurality of optical reflection modules 1, an imaging device 3, a control unit 4 and an image processing unit. Each optical reflection module 1 is composed of a plurality of reflection elements 8, and can image the detected planar object at one or more inclined observation angles within a 360-degree range or a specific direction range. For example, the optical reflection module 1 can include a combination of four optical reflection elements for achieving multi-directional observation.

[0080] Taking the laptop shell as an example, its surface may have scratches, abrasions, pits, bulges and other defects, and these defects have different reflection characteristics at different height angles and directions. By adjusting the height of the optical reflection module 1 and / or setting multiple optical modules, the shell surface can be imaged from multiple tilted viewing angles and 360-degree viewing directions to ensure that all possible defects are captured.

[0081] In the specific implementation process, the laptop computer shell to be inspected is fixed on the inspection platform. The control unit 4 adjusts the position of the optical reflection module 1 relative to the plane to be inspected so that the optical reflection module 1 is aligned with the area to be inspected. The imaging device 3 captures the images reflected by the optical reflection module 1, which cover all directions and tilted observation angles of the shell surface.

[0082] The captured images are transmitted to the image processing unit for defect analysis. The image processing unit contains an automatic optical inspection module that can identify and locate a variety of defects including scratches, abrasions, pits, bulges, dirt, etc. Multi-angle image processing not only improves the coverage of defect detection, but also reduces the possibility of missed detection and false detection.

[0083] In order to further improve the applicability of the system, the optical reflection module 1 is equipped with a plurality of reflection elements 8, through which the flat objects can be imaged in a wider range of observation directions. The design of the barrel mount 9 ensures the stability and adjustability of the system, so that the system can be flexibly applied in different production environments.

[0084] The system is not only suitable for testing mobile phone glass cover plates, tablet computer cover plates, computer display cover plates, and laptop computer shells, but also for various display screens, mobile phone / tablet back covers, protective shells, metal or non-metallic films, films, glass, metal plates and smooth surfaces of other materials (such as special fabrics, paper, fibers, etc.).

[0085] It can be seen from the above embodiments that the plane defect detection system of a single or multiple N-spectral optical reflection modules can achieve comprehensive and efficient detection of surface defects of planar objects without increasing system complexity and cost. The system has important application value in the manufacturing process of various high-demand products.

[0086] Embodiment 3:

[0087] In the process of industrial product production, comprehensive and efficient plane defect detection is crucial to ensure product quality. The following is combined with specific application examples to further illustrate the technical solution of the present invention and its significant beneficial effects.

[0088] 1. Comprehensive and efficient defect detection

[0089] The present invention realizes multi-directional observation and imaging of planar objects by means of optical reflection modules 1 arranged at different heights, thereby ensuring that general defects and defects with directionality and angle can be captured.

[0090] For example, mobile phone glass cover plate inspection. In the production of mobile phone glass cover plates, surface scratches, abrasions and other defects are often difficult to detect due to their directionality and angle. The traditional fixed-angle detection method cannot fully capture these defects, resulting in a high rate of product failure. Through the N-split optical reflection module design of the present invention, the imaging device 3 can perform an all-round scan of the glass cover plate from different inclined observation angles through different optical modules, thereby effectively detecting all surface defects, avoiding missed detection and false detection problems, and improving product quality.

[0091] 2. Economical and efficient system design.

[0092] The present invention adopts an optical reflective element reflection solution, which greatly reduces the number of cameras used. Compared with a multi-angle imaging system that requires a large number of camera devices, it significantly reduces system complexity and cost.

[0093] For example, laptop shell inspection. The surface of the laptop shell is usually required to be free of any pits, bulges and other defects. Traditional multi-camera systems are complex and expensive, and difficult to promote and apply in large-scale production. The present invention can achieve multi-angle and high-coverage inspection through the flexible configuration of multiple optical reflection modules 1, with only a small number of camera devices, which greatly reduces costs and improves inspection efficiency and economic benefits.

[0094] 3. Wide scope of application.

[0095] The present invention is applicable to the plane defect detection of various industrial products, including but not limited to mobile phone glass cover plates, tablet computer cover plates, computer display screen cover plates, laptop computer casings, etc.

[0096] For example, special fabric inspection. In high-end clothing production, the surface smoothness and flawlessness of special fabrics are key indicators of quality. Through the multi-angle imaging system of the present invention, the surface of special fabrics can be fully inspected, and fiber defects, dirt and other problems on the surface of the fabric can be discovered and corrected in time to ensure the high quality of the final product.

[0097] 4. Multi-angle imaging.

[0098] The present invention achieves multi-tilt observation angle imaging by adjusting the height of the optical reflection module 1 and / or setting multiple optical modules, effectively capturing defects that can only be seen at specific tilted observation angles and / or in specific observation directions, thereby significantly improving the comprehensiveness and accuracy of detection.

[0099] For example, metal sheet inspection. Defects such as pits and scratches on the surface of metal sheets are only visible at a specific angle. Traditional fixed-angle inspections are difficult to detect these problems. The present invention configures multiple sets of optical reflection modules 1 at different tilt angles, so that every surface of the metal sheet can be fully inspected, thereby ensuring the surface quality of the metal sheet.

[0100] Embodiment 4:

[0101] In this embodiment, a plane defect detection system of a single or multiple N-division optical reflection modules is provided, characterized in that the system includes one or more optical reflection modules, an imaging device, a control unit and an image processing unit. The details are as follows:

[0102] First, the optical reflection module includes a plurality of optical reflection elements with installation directions in different directions, and the angles of the optical reflection elements include but are not limited to 30 degrees and 60 degrees. These optical reflection elements are used to image the plane object under inspection in different observation directions, thereby simulating the effect of observing the object from different directions at the same inclined observation angle.

[0103] Secondly, the optical reflection module contains multiple reflection elements, including but not limited to eight reflection elements. By combining these reflection elements, a 360-degree viewing direction can be simulated. Although these reflection elements form images on multiple surfaces, all imaging surfaces face the same direction, which is convenient for the imaging device to capture images.

[0104] Then, the imaging device is used to capture the image of the flat object reflected by the optical reflection module, ensuring that all reflected images are facing the same direction, including horizontal imaging, direct imaging and indirect imaging. In this way, the stability and consistency of the imaging can be improved, which is convenient for subsequent image processing.

[0105] The control unit is used to adjust the position and orientation of the optical reflection module relative to the detected plane to achieve multi-angle and multi-directional observation of the detected plane object. Through the adjustment of the control unit, the optical reflection module can flexibly change its angle and position, thereby achieving accurate detection of different parts and directions.

[0106] Finally, the image processing unit is used to analyze the image captured by the imaging device and detect defects on the surface of the planar object. The image processing unit includes one or more automatic optical inspection modules, which can detect various defects on the surface of the planar object, including but not limited to scratches, abrasions, pits, bulges and dirt defects.

[0107] To summarize, the planar defect detection system of a single or multiple N-split optical reflection modules provided in this embodiment simulates a 360-degree observation direction through a combination of multiple optical reflection elements installed in different directions and multiple reflection elements, thereby achieving efficient and accurate defect detection of the planar objects being inspected.

[0108] Embodiment 5:

[0109] In the aerospace field, for example, the detection of aircraft skin surfaces is crucial to flight safety. Traditional detection methods are often limited by angles and are difficult to fully capture surface defects. In order to improve detection accuracy and coverage, the present invention provides a plane defect detection system based on a multi-angle optical reflective element, which can perform all-round and multi-angle accurate detection of aircraft skin surfaces.

[0110] 1. System composition:

[0111] The system includes an optical reflection module, an imaging device, a control unit and an image processing unit.

[0112] Optical reflection module: includes one or more optical reflection elements, which are arranged to form an observation plane that surrounds 360 degrees or a specific direction range. Through the adjustment of the control unit, the optical reflection element can be raised and lowered to conduct all-round observation of the aircraft skin at an inclined observation angle of 30 degrees, 45 degrees, and 60 degrees.

[0113] Imaging device: used to capture the skin surface image reflected by the optical reflection module. The imaging device can be a high-definition camera to ensure high-resolution images.

[0114] Control unit: used to adjust the position and orientation of the optical reflection module relative to the detected plane. The control unit includes X-axis, Y-axis and Z-axis displacement mechanisms, which can achieve multi-angle and multi-directional observation by precisely controlling the movement of the optical reflection module.

[0115] Image processing unit: used to analyze images captured by imaging equipment and detect defects on the aircraft skin surface. The image processing unit contains an automatic optical inspection module that can identify and locate various surface defects.

[0116] 2. Testing process:

[0117] Fix the aircraft skin to be tested on the testing platform.

[0118] Start the system, and the control unit adjusts the position of the optical reflection module relative to the plane to be detected, so that one or more optical reflection elements can perform 360-degree all-round observation of the skin surface at inclined observation angles of 30 degrees, 45 degrees, and 60 degrees respectively.

[0119] The imaging device captures the skin surface image reflected by the optical reflection module, ensuring that all reflected images are facing the same direction.

[0120] The image processing unit receives and analyzes the captured images to detect possible scratches, pits, bulges and other defects on the skin surface. The automatic optical inspection module is based on image recognition and processing technology, which can efficiently and accurately identify and locate surface defects.

[0121] 3. Application scenarios:

[0122] In the process of aircraft production and maintenance, the inspection of the skin surface is very important. Through the multi-angle observation of this system, the reflection characteristics of the skin surface installed in different directions can be fully captured, so as to more accurately detect potential surface defects and ensure flight safety.

[0123] 4. Technical advantages:

[0124] Comprehensive coverage: For example, one or more optical reflective elements can be installed in different directions to provide a 360-degree view, ensuring that all defects on the skin surface are captured.

[0125] High precision: The combination of imaging at multiple tilted observation angles and automatic optical detection modules greatly improves detection accuracy and reduces the possibility of missed detection and false detection.

[0126] Flexible adjustment: The control unit can accurately adjust the position and angle of the optical reflection module to adapt to different detection requirements and improve the applicability and flexibility of the system.

[0127] Cost-effective: Compared with traditional multi-camera systems, the present invention reduces system complexity and cost while maintaining high-precision detection.

[0128] In summary, the plane defect detection system based on multi-angle optical reflective elements provided by the present invention realizes comprehensive and efficient detection of the aircraft skin surface through flexible configuration and multi-angle imaging of more than one optical reflective elements, and has important application value.

[0129] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0130] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A planar defect detection system with a single or multiple N-spectral optical reflection modules, characterized in that: include: One or more optical reflection modules, each module including at least one optical reflection element, for imaging the detected planar object at one or more inclined observation angles; An imaging device, used to capture an image of a planar object reflected by the optical reflection module; The image processing unit is used to analyze the image captured by the imaging device and detect defects on the surface of the planar object.

2. A plane defect detection system of a single or multiple N-spectral optical reflection modules according to claim 1, characterized in that: The planar defect detection system of a single or multiple N-split optical reflection modules also includes a reflection element. The optical reflection module covers different observation directions at the same inclined observation angle through the reflection element to achieve imaging of the plane object being detected at one or more inclined observation angles.

3. A plane defect detection system of a single or multiple N-division optical reflection modules according to claim 1, characterized in that: The image processing unit includes one or more automatic optical detection modules for detecting defects on the surface of a planar object, including but not limited to scratches, abrasions, pits, bulges, and dirt.

4. A plane defect detection system of a single or multiple N-division optical reflection modules according to claim 1, characterized in that: The optical reflection module includes multiple optical reflection elements installed in different directions. The angles of N reflection elements in one optical reflection module relative to the horizontal plane are the same, and each reflection element covers a different observation direction within a 360-degree range or a specific direction range; the angles of the reflection elements in different optical reflection modules relative to the horizontal plane can be the same or different, corresponding to the same or different inclined observation angles, and the inclined observation angles include but are not limited to the range of 10 degrees to 85 degrees.

5. A plane defect detection system of a single or multiple N-division optical reflection modules according to claim 1, characterized in that: The optical reflection module includes multiple reflection elements, including but not limited to eight reflection elements. These reflection elements are combined to simulate the observation direction of 360 degrees or a specific direction range. The images reflected by the reflection elements are all facing the same direction to facilitate imaging by the imaging device.

6. A plane defect detection system of a single or multiple N-division optical reflection modules according to claim 1, characterized in that: The optical reflection module simulates observing the detected planar object from different directions at the same inclined observation angle by installing optical reflection elements facing different directions. The inclined observation angle is the same or different in different optical reflection modules and the same in the same optical reflection module, and secondary imaging is performed after reflection.

7. A plane defect detection system of a single or multiple N-division optical reflection modules according to claim 1, characterized in that: The system ensures that all reflected images are directed in the same direction, including horizontal imaging, direct imaging and indirect imaging, so as to improve detection accuracy.

8. A planar defect detection method based on a single or multiple N-spectral optical reflection modules, characterized in that: include: Step 1: One or more optical reflection modules are provided to perform single or multiple tilted observation angle imaging on the detected planar object; each optical reflection module includes at least one optical reflection element, which is used to perform 360-degree all-round or specific direction range observation or imaging on the detected planar object at a certain tilted observation angle; Step 2: using an imaging device to capture an image of a planar object reflected by the optical reflection module; Step 3: Use an image processing unit to analyze the image captured by the imaging device to detect defects on the surface of the planar object.

9. A planar defect detection method based on a single or multiple N-spectral optical reflection modules according to claim 8, characterized in that: The step 1 further includes setting one or more optical reflective elements to form an observation plane that surrounds 360 degrees or a specific direction range; different optical reflective modules are provided with reflective elements that form different or the same angles with the horizontal plane, so that different optical reflective modules can image or observe the detected plane object within 360 degrees or a specific direction range at an inclined observation angle including but not limited to 20 degrees, 40 degrees, and 60 degrees; step 2 further includes using multiple reflective elements, including but not limited to eight reflective elements, to achieve imaging of the detected plane object within 360 degrees or a specific direction range, and the images reflected by the reflective elements are all facing the same direction to facilitate imaging by the imaging device; step 3 further includes performing multi-angle observation through optical reflective elements in different directions at the same inclined observation angle, the inclined observation angles are the same or different in different optical reflective modules, and the same in the same optical reflective module, and secondary imaging is performed through reflection.

10. A planar defect detection method based on a single or multiple N-spectral optical reflection modules according to claim 8, characterized in that: The scope of application of the method includes but is not limited to mobile phone glass cover plates, tablet computer glass cover plates, computer display screen cover plates, laptop computer display screen cover plates, mobile phone display screens, computer display screens, tablet computer display screens, watch display screens, bracelet display screens, mobile phone and tablet computer back covers or protective shells, laptop computer shells, tablet computer shells, mobile phone shells, watch shells, and bracelet shells; wherein the laptop computer shell includes an ACD panel; and the method is also applicable to surfaces of smooth materials, and the smooth material surfaces include but are not limited to metal or non-metallic film materials, thin films, glass, metal surfaces, and ceramic surfaces; and the method is also applicable to smooth surface detection of special material fabrics, paper, and fibers.

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