Shooting method for surface and internal flaws of transparent high-reflection object

Abstract

The invention discloses a method for shooting surface and internal flaws of a transparent highly-reflective object, relates to the field of shooting of surface and internal flaws of objects, and aims to solve the problems that the surface and internal flaws are difficult to shoot clearly due to local over-brightness caused by reflective property when a conventional lighting and shooting mode is used in the conventional shooting method, and the shooting effect is poor. According to the technical scheme, the device is characterized by comprising a detection main body, a computer control module, a high-precision industrial camera, a lens, an objective table, a special light source assembly and a stepping motor rotating bracket, comprising the following steps: step 1, clamping an object to be shot on an objective table through a clamp, and selecting a proper lens according to the focal depth and the focal length to be connected with a high-precision industrial camera; 2, the high-precision industrial camera and the special light source assembly are turned on, a light source emitted by the special light source assembly irradiates from the lower portion of the object, and the high-precision industrial camera shoots from the upper portion of the object.

Description

Technical Field

[0001] The present invention relates to the technical field of photographing surface and internal defects of an object, and in particular to a method for photographing surface and internal defects of a transparent and highly reflective object. Background Art

[0002] Defects usually refer to defects, stains, scratches, damage, etc. on the surface or inside of an object that do not meet normal standards or expectations. In photography, defects may appear as goofs in the photo, abrupt objects, visual discomfort caused by light sources and colors, etc. Defect photography is a complex process involving many aspects. It not only requires the photographer to have professional photography skills, but also requires an in-depth understanding and grasp of the defects themselves. Defect photography is a process that requires professional skills and careful observation; with the development of artificial intelligence technology, the technology of using AI algorithms to detect surface defects of objects is becoming more and more mature. AI algorithms are inspired by the laws of nature and simulate problem-solving algorithms based on their principles. They enable computers to learn from previous results and obtain updated information without human intervention.

[0003] After searching, in the prior art, the publication number CN115439389A discloses a method and device for detecting surface defects of an object. The method comprises: inputting an image into a defect detection model to obtain a feature map output by each network layer of the defect detection model, wherein the defect detection model adopts a pruned lightweight network; convolving and fusing the feature maps output by N network layers of the defect detection model through at least partially different convolution kernels to obtain a first feature map, wherein N is an integer less than the number of network layers of the lightweight network; performing atrous convolution pooling on the feature map output by one network layer of the defect detection model to obtain a feature map; superimposing the pooled feature maps in sequence and obtaining a second feature map by upsampling; and fusing the first feature map and the second feature map to obtain the position of the defect in the image; dividing the object according to the position of the defect in the image and the category of the defect; and performing subsequent operations on the object according to the division result.

[0004] However, the device and the prior art still have the following defects:

[0005] How to collect a large amount of clear and representative image data is an important issue in the detection process, and it is even more so for transparent and highly reflective objects. Glass, polyurethane, PC, plastic, resin and other materials have high light transmittance and high reflectivity. The impurities, scratches, breakage and other defects on their surfaces and insides cannot be detected by traditional lighting and shooting methods. For surface and internal defects, light transmittance requires that the light source brightness must be extremely high, while reflectivity will cause the area to be too bright and difficult to shoot clearly, which makes it difficult to collect image data and it is easy to miss some defects during detection, which cannot meet the usage requirements. Summary of the invention

[0006] The purpose of the present invention is to provide a method for photographing surface and internal defects of a transparent and highly reflective object.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for photographing the surface and internal defects of a transparent and highly reflective object includes a detection subject, a computer control module, a high-precision industrial camera, a lens, a stage, a special light source component, and a stepper motor rotating bracket, and includes the following steps:

[0009] Step 1: Use a clamp to clamp the object to be photographed and place it on the stage. Select a suitable lens based on the focal depth and focal length and connect it to the high-precision industrial camera.

[0010] Step 2: Turn on the high-precision industrial camera and the special light source assembly. The special light source assembly emits light from the bottom of the object, and the high-precision industrial camera shoots from the top of the object.

[0011] Step 3: Use the stepper motor to rotate the bracket to drive the special light source assembly to rotate horizontally, thereby changing the position of the special light source assembly. Each rotation of the special light source assembly triggers the high-precision industrial camera to take a photo, completely photographing the entire surface and interior of the object. All the taken pictures are uploaded to the computer control module for storage and processing, so as to achieve the capture of surface and internal defects of the object.

[0012] Furthermore, a computer control module is provided at the front end of the detection body, and the computer control module is connected to the detection body by screws, a first mounting groove and a second mounting groove are provided on the side wall of the detection body, a stage is provided on the inner side of the detection body, and the stage is fixedly connected to the detection body, a first mounting plate is provided above the stage, one end of the first mounting plate extends to the inside of the first mounting groove, and the first mounting plate is slidably connected to the detection body, a high-precision industrial camera is provided at the front end of the first mounting plate, and the high-precision industrial camera is connected to the first mounting plate by screws, a lens is provided below the high-precision industrial camera, and the lens is slidably connected to the high-precision industrial camera. The machine is threadedly connected, a second mounting plate is arranged below the stage, one end of the second mounting plate extends to the inside of the second mounting slot, and the second mounting plate detection body is slidably connected, a stepper motor rotating bracket is arranged at the front end of the second mounting plate, and the stepper motor rotating bracket is connected to the second mounting plate by screws, a special light source assembly is arranged above the stepper motor rotating bracket, and the special light source assembly is fixedly connected to the stepper motor rotating bracket, the high-precision industrial camera, lens, special light source assembly and stepper motor rotating bracket are arranged in sequence from top to bottom, and the high-precision industrial camera, special light source assembly and stepper motor rotating bracket are electrically connected to the computer control module.

[0013] Furthermore, a first electric push rod is disposed inside the first mounting groove, and the first electric push rod is disposed above the first mounting plate, and the first electric push rod is fixedly connected to the detection body and the first mounting plate.

[0014] By adopting the above technical solution, the first electric push rod drives the first mounting plate to rise and fall along the first mounting groove, and the height of the first mounting plate is changed, so that the distance between the high-precision industrial camera and the stage can be changed.

[0015] Furthermore, a second electric push rod is disposed inside the second mounting groove, and the second electric push rod is disposed below the second mounting plate, and the second electric push rod is fixedly connected to the detection body and the second mounting plate.

[0016] By adopting the above technical solution, the second electric push rod drives the second electric push rod to rise and fall along the second mounting groove, thereby changing the height of the second mounting plate and changing the distance between the special light source assembly and the stage.

[0017] Furthermore, guide holes are provided on the first mounting plate and the second mounting plate, guide rods are provided inside the first mounting groove and the second mounting groove, and both ends of the guide rods are fixedly connected to the detection body, the guide rods are arranged through the guide holes, and the guide rods are slidably connected to the first mounting plate and the second mounting plate.

[0018] By adopting the above technical solution, the guide rod slides when the first mounting plate and the second mounting plate are lifted or lowered, and plays a guiding and limiting role for the lifted or lowered first mounting plate and the second mounting plate, ensuring that the first mounting plate and the second mounting plate are lifted or lowered smoothly.

[0019] Furthermore, the special light source assembly in step 2 is a planar light source, which is covered with grid-like stripes, and the thickness of the stripes can be controlled in real time by a built-in host computer.

[0020] By adopting the above technical solution, by controlling the stripe thickness, stripe direction, exposure time, and utilizing the diffraction effect of the grating, it is possible to capture defects as small as 0.1mm and as large as 10cm, and to capture defects in all directions. The diffraction effect principle is as follows: Figure 3 As shown, a is the width of the light-transmitting slit, b is the width of the opaque part, d = a + b, φ is the angle of incidence, λ is the wavelength of light, and k is any positive integer. It can be concluded from the small right triangle in the figure that when d = kλ*sinφ, kλ is the optical path difference between the upper and lower lights, which will form bright fringes, that is, strengthen the light. Therefore, adjusting the thickness of the fringes is to adjust the size of a and b. The width of the shielding band is adjusted by a special light source. When ab changes, for a specific position, the λ corresponding to the bright fringes formed at this position, that is, the wavelength, changes. Therefore, when the value of ab is adjusted continuously, it is equivalent to using light containing more wavelengths at different times at each position for irradiation. For defects, when the wavelength of the irradiating light is proportional to the actual size of the defect, the edge of the defect will be clearer, that is, the defect is captured. Continuously adjusting the thickness of the grating can cover defects of all sizes.

[0021] Furthermore, the high-precision industrial camera in step 2 has the function of realizing millisecond-level shooting control and exposure adjustment.

[0022] By adopting the above technical solution, the selection of the lens determines the focal depth and focal length according to the thickness and distance respectively. The high-precision industrial camera can quickly and accurately complete the shooting of multiple photos through 10ms-level shooting control, thereby obtaining photo information in all the above situations.

[0023] In summary, the beneficial technical effects of the present invention are:

[0024] 1. It uses high-precision industrial cameras, special light source components and stepper motor rotating brackets. The special light source component emits light from the bottom of the object, and the high-precision industrial camera shoots from the top of the object. The high-precision industrial camera has the function of realizing millisecond-level shooting control and exposure adjustment, and can quickly and accurately complete the shooting of multiple photos. The special light source component is a plane light source, which is covered with grid-like stripes, and the thickness of the stripes can be controlled in real time by the built-in host computer. The stepper motor rotating bracket drives the special light source component to rotate horizontally, changes the position of the special light source component, changes the direction of the diffracted light, and covers defects in all directions. Each rotation of the special light source component triggers the high-precision industrial camera to take a photo, and the entire surface and interior of the object are completely photographed. All the photographed pictures are uploaded to the computer control module for storage and processing, and the surface and internal defects of the object are photographed. By controlling the stripe thickness of the special light source, adjusting the grating interval, rotating the grating direction, and adjusting the depth of focus, the defects of all sizes and directions can be photographed, which prevents the missed shots and missed inspections caused by the local highlights caused by the surface reflection, and realizes the complete shooting of the entire object to be inspected, eliminating omissions.

[0025] 2. The first electric push rod and the second electric push rod are used. The first electric push rod drives the first mounting plate to rise and fall along the first mounting groove. Changing the height of the first mounting plate can change the distance between the high-precision industrial camera and the stage. The second electric push rod drives the second electric push rod to rise and fall along the second mounting groove. Changing the height of the second mounting plate changes the distance between the special light source assembly and the stage, which can meet the needs of shooting surfaces and internal defects of objects of different sizes and thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 The present invention Figure 1 A partial enlarged view of area A;

[0029] Figure 3 It is a schematic diagram of the formation principle of diffraction light of the present invention.

[0030] In the figure, 1. detection subject; 2. computer control module; 3. first mounting slot; 4. second mounting slot; 5. first mounting plate; 6. high-precision industrial camera; 7. lens; 8. first electric push rod; 9. stage; 10. second mounting plate; 11. special light source assembly; 12. stepper motor rotating bracket; 13. second electric push rod; 14. guide hole; 15. guide rod. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0033] See also Figure 1-3 The present invention provides a technical solution: a method for photographing the surface and internal defects of a transparent and highly reflective object, comprising a detection subject 1, a computer control module 2, a high-precision industrial camera 6, a lens 7, a stage 9, a special light source component 11 and a stepper motor rotating bracket 12, comprising the following steps:

[0034] Step 1: Use a clamp to clamp the object to be photographed and place it on the stage 9, and select a suitable lens 7 to connect with the high-precision industrial camera 6 according to the focal depth and focal length;

[0035] Step 2: Turn on the high-precision industrial camera 6 and the special light source assembly 11. The special light source assembly 11 emits light to illuminate the object from below, and the high-precision industrial camera 6 takes a picture from above the object.

[0036] Step three: Use the stepper motor to rotate the bracket 12 to drive the special light source assembly 11 to rotate horizontally, change the position of the special light source assembly 11, and trigger the high-precision industrial camera 6 to take a photo every time the special light source assembly 11 rotates, and the entire surface and interior of the object are completely photographed, and all the taken pictures are uploaded to the computer control module 2 for storage and processing, so as to achieve the capture of surface and internal defects of the object.

[0037] See also Figure 1A computer control module 2 is provided at the front end of the detection body 1, and the computer control module 2 is connected to the detection body 1 by screws. A first mounting groove 3 and a second mounting groove 4 are provided on the side wall of the detection body 1. A stage 9 is provided on the inner side of the detection body 1, and the stage 9 is fixedly connected to the detection body 1. A first mounting plate 5 is provided above the stage 9, one end of the first mounting plate 5 extends to the inside of the first mounting groove 3, and the first mounting plate 5 is slidably connected to the detection body 1. A high-precision industrial camera 6 is provided at the front end of the first mounting plate 5, and the high-precision industrial camera 6 is connected to the first mounting plate 5 by screws. A lens 7 is provided below the high-precision industrial camera 6, and the lens 7 is threadedly connected to the high-precision industrial camera 6. The stage 9 A second mounting plate 10 is arranged below, one end of the second mounting plate 10 extends to the inside of the second mounting groove 4, and the second mounting plate 10 is slidingly connected to the detection body 1, a stepper motor rotating bracket 12 is arranged at the front end of the second mounting plate 10, and the stepper motor rotating bracket 12 is connected to the second mounting plate 10 by screws, a special light source assembly 11 is arranged above the stepper motor rotating bracket 12, and the special light source assembly 11 is fixedly connected to the stepper motor rotating bracket 12, the high-precision industrial camera 6, the lens 7, the special light source assembly 11 and the stepper motor rotating bracket 12 are arranged in sequence from top to bottom, and the high-precision industrial camera 6, the special light source assembly 11 and the stepper motor rotating bracket 12 are electrically connected to the computer control module 2.

[0038] See also Figure 1 and Figure 2 A first electric push rod 8 is arranged inside the first mounting groove 3, and the first electric push rod 8 is arranged above the first mounting plate 5. The first electric push rod 8 is fixedly connected to the detection body 1 and the first mounting plate 5. The first electric push rod 8 drives the first mounting plate 5 to rise and fall along the first mounting groove 3, changes the height of the first mounting plate 5, and changes the distance between the high-precision industrial camera 6 and the stage 9.

[0039] See also Figure 1 and Figure 2 A second electric push rod 13 is arranged inside the second mounting groove 4, and the second electric push rod 13 is arranged below the second mounting plate 10. The second electric push rod 13 is fixedly connected to the detection body 1 and the second mounting plate 10. The second electric push rod 13 drives the second electric push rod 13 to rise and fall along the second mounting groove 4, thereby changing the height of the second mounting plate 10 and changing the distance between the special light source assembly 11 and the stage 9.

[0040] See also Figure 1 and Figure 2A guide hole 14 is provided on the first mounting plate 5 and the second mounting plate 10, and a guide rod 15 is provided inside the first mounting groove 3 and the second mounting groove 4, and both ends of the guide rod 15 are fixedly connected to the detection body 1, the guide rod 15 and the guide hole 14 are arranged through, and the guide rod 15 is slidably connected to the first mounting plate 5 and the second mounting plate 10, and the guide rod 15 slides when the first mounting plate 5 and the second mounting plate 10 are lifted or lowered, and plays a guiding and limiting role for the lifted first mounting plate 5 and the second mounting plate 10, ensuring that the first mounting plate 5 and the second mounting plate 10 are lifted or lowered smoothly.

[0041] See also Figure 3 The special light source component 11 in step 2 is a plane light source, which is covered with grid-like stripes, and the thickness of the stripes can be controlled in real time by the built-in host computer. By controlling the stripe thickness, stripe direction, and exposure time, the diffraction effect of the grating can be used to capture defects as small as 0.1mm and as large as 10cm, and to capture defects in all directions. The diffraction effect principle is as follows Figure 3 As shown, a is the width of the light-transmitting slit, b is the width of the opaque part, d = a + b, φ is the angle of incidence, λ is the wavelength of light, and k is any positive integer. It can be concluded from the small right triangle in the figure that when d = kλ*sinφ, kλ is the optical path difference between the upper and lower lights, which will form bright fringes, that is, strengthen the light. Therefore, adjusting the thickness of the fringes is to adjust the size of a and b. The width of the shielding band is adjusted by a special light source. When ab changes, for a specific position, the λ corresponding to the bright fringes formed at this position, that is, the wavelength, changes. Therefore, when the value of ab is adjusted continuously, it is equivalent to using light containing more wavelengths at different times at each position for irradiation. For defects, when the wavelength of the irradiating light is proportional to the actual size of the defect, the edge of the defect will be clearer, that is, the defect is captured. Continuously adjusting the thickness of the grating can cover defects of all sizes.

[0042] See also Figure 3 The high-precision industrial camera 6 in step 2 has the function of realizing 10 millisecond-level shooting control and exposure adjustment. The selection of lens 7 determines the focal depth and focal length according to the thickness and distance respectively. The high-precision industrial camera 6 can quickly and accurately complete the shooting of multiple photos through 10ms-level shooting control, thereby obtaining photo information in all the above situations.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for photographing surface and internal defects of a transparent and highly reflective object, comprising a detection subject (1), a computer control module (2), a high-precision industrial camera (6), a lens (7), a stage (9), a special light source component (11) and a stepping motor rotating bracket (12), characterized in that: The following steps are involved: Step 1: Use a clamp to clamp the object to be photographed and place it on the stage (9), and select a suitable lens (7) to connect it to a high-precision industrial camera (6) according to the focal depth and focal length; Step 2: Turn on the high-precision industrial camera (6) and the special light source assembly (11), the special light source assembly (11) emits light to illuminate the object from below, and the high-precision industrial camera (6) takes a picture from above the object; Step 3: The special light source assembly (11) is driven to rotate horizontally by a stepper motor rotating bracket (12), thereby changing the position of the special light source assembly (11). Each rotation of the special light source assembly (11) triggers a high-precision industrial camera (6) to take a photo, and the entire surface and interior of the object are completely photographed. All the photographed images are uploaded to the computer control module (2) for storage and processing, thereby realizing the photography of surface and internal defects of the object.

2. A method for photographing surface and internal defects of a transparent and highly reflective object according to claim 1, characterized in that: A computer control module (2) is provided at the front end of the detection body (1), and the computer control module (2) is connected to the detection body (1) by screws. A first mounting groove (3) and a second mounting groove (4) are provided on the side wall of the detection body (1). A loading platform (9) is provided on the inner side of the detection body (1), and the loading platform (9) is fixedly connected to the detection body (1). A first mounting plate (5) is provided above the loading platform (9), one end of the first mounting plate (5) extends to the inside of the first mounting groove (3), and the first mounting plate (5) is slidably connected to the detection body (1). A high-precision industrial camera (6) is provided at the front end of the first mounting plate (5), and the high-precision industrial camera (6) is connected to the first mounting plate (5) by screws. A lens (7) is provided below the high-precision industrial camera (6), and the lens (7) is threadedly connected to the high-precision industrial camera (6). A second mounting plate (10) is arranged below the stage (9), one end of the second mounting plate (10) extends to the inside of the second mounting groove (4), and the second mounting plate (10) is slidably connected to the detection body (1), a stepper motor rotating bracket (12) is arranged at the front end of the second mounting plate (10), and the stepper motor rotating bracket (12) is connected to the second mounting plate (10) by screws, a special light source assembly (11) is arranged above the stepper motor rotating bracket (12), and the special light source assembly (11) is fixedly connected to the stepper motor rotating bracket (12), the high-precision industrial camera (6), the lens (7), the special light source assembly (11) and the stepper motor rotating bracket (12) are arranged in sequence from top to bottom, and the high-precision industrial camera (6), the special light source assembly (11) and the stepper motor rotating bracket (12) are all electrically connected to the computer control module (2).

3. A method for photographing surface and internal defects of a transparent and highly reflective object according to claim 2, characterized in that: A first electric push rod (8) is arranged inside the first mounting groove (3), and the first electric push rod (8) is arranged above the first mounting plate (5). The first electric push rod (8) is fixedly connected to the detection body (1) and the first mounting plate (5).

4. The method for photographing surface and internal defects of a transparent and highly reflective object according to claim 3, characterized in that: A second electric push rod (13) is arranged inside the second mounting groove (4), and the second electric push rod (13) is arranged below the second mounting plate (10). The second electric push rod (13) is fixedly connected to the detection body (1) and the second mounting plate (10).

5. The method for photographing surface and internal defects of a transparent and highly reflective object according to claim 4, characterized in that: The first mounting plate (5) and the second mounting plate (10) are both provided with guide holes (14), the first mounting groove (3) and the second mounting groove (4) are both provided with guide rods (15), and both ends of the guide rods (15) are fixedly connected to the detection body (1), the guide rods (15) and the guide holes (14) are connected, and the guide rods (15) are slidably connected to the first mounting plate (5) and the second mounting plate (10).

6. The method for photographing surface and internal defects of a transparent and highly reflective object according to claim 1, characterized in that: The specially made light source assembly (11) in step 2 is a planar light source, which is covered with grid-like stripes, and the thickness of the stripes can be controlled in real time by a built-in host computer.

7. The method for photographing surface and internal defects of a transparent and highly reflective object according to claim 1, characterized in that: The high-precision industrial camera (6) in step 2 has the function of realizing 10 millisecond-level shooting control and exposure adjustment.

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