Trademark detection system and detection method for automobile laminated glass

Abstract

The invention provides a trademark detection system for automobile laminated glass, and the system comprises a rack which is provided with a conveying belt and is used for conveying the laminated glass; the first camera and the second camera are respectively arranged above and below the conveying belt, are used for shooting upper and lower surface images of the laminated glass, and can horizontally move along the direction vertical to the conveying direction of the conveying belt; and the image processing system is connected with the first camera and the second camera, receives and processes the upper surface image and the lower surface image of the glass, judges whether trademarks are printed on the upper surface and the lower surface of the laminated glass or not, and detects whether the trademarks are qualified or not. The detection method comprises the steps of exposure shooting, image processing and qualification judgment, if the trademark is detected to be qualified, the laminated glass is conveyed to the next process, and if the trademark is detected to be unqualified, the laminated glass stays to be processed. Through an automatic detection means and an image processing algorithm, trademark details on the glass can be accurately recognized, the detection efficiency and precision are greatly improved, and manual intervention and waiting time are shortened.

Description

Technical Field

[0001] The invention relates to the technical field of automatic welding equipment, and in particular to a trademark detection system and a detection method for automobile laminated glass. Background Art

[0002] The laminated glass for car doors needs to be joined during the production process, that is, the side with the printed trademark needs to be joined with the side without the printed trademark. The trademark needs to be identified at the joining position to ensure that the trademark position of the laminated glass is correct and to avoid the flow of unbranded laminated glass or double-branded laminated glass to customers.

[0003] The prior art is that after the laminated glass is joined, it is transferred to the joining position and flows into the next link after being manually identified. If the joining is wrong, the corresponding laminated glass will be taken away. Each time a piece of laminated glass is confirmed, a confirmation button is pressed manually and the next piece of laminated glass enters the joining position. Although the trademark is manually identified and confirmed after the glass is joined, the identification and confirmation efficiency is low and there will be cases of missed detection.

[0004] Therefore, it is necessary to improve the existing technology. Summary of the invention

[0005] The present invention provides a trademark detection system and a detection method for automobile laminated glass, which are used to solve the above problems.

[0006] A technical solution adopted by the present invention is to provide a trademark detection system for automotive laminated glass, comprising:

[0007] A frame, on which a conveyor belt is arranged for conveying laminated glass;

[0008] The first camera is arranged above the conveyor belt and is used to capture the upper surface image of the laminated glass, and can move horizontally along the conveying direction of the vertical conveyor belt;

[0009] The second camera is arranged below the conveyor belt and is used to take an image of the lower surface of the laminated glass. The camera can move horizontally along the conveying direction of the vertical conveyor belt.

[0010] The image processing system is connected to the first camera and the second camera, receives and processes the upper surface image and the lower surface image of the glass, determines whether the upper surface and the lower surface of the laminated glass are printed with trademarks, and detects whether the trademarks are qualified.

[0011] Furthermore, the first camera is arranged on the frame via a first guide rail and is controlled by a first driving mechanism to move in a horizontal direction, and the second camera is arranged on the frame via a second guide rail and is controlled by a second driving mechanism to move in a horizontal direction to adapt to the trademark detection position on the laminated glass.

[0012] Furthermore, both the first driving mechanism and the second driving mechanism are integrated with a position feedback device to achieve precise positioning of the camera.

[0013] Furthermore, the first camera and the second camera are both high-resolution industrial cameras, and the shooting ends thereof are both provided with fill light panels for exposing the trademark on the surface of the laminated glass so that the corresponding camera can capture the reflected trademark.

[0014] Furthermore, the image processing system includes a real-time image processing unit and a feature extraction and matching unit. The real-time image processing unit is used to preprocess the upper surface image and the lower surface image. The feature extraction and matching unit is used to extract trademark image features and match them with preset templates to determine the existence and correctness of the trademark.

[0015] Furthermore, it also includes a first sensor and a second sensor, which are sequentially arranged on one side of the conveyor belt along the conveying direction of the conveyor belt, and are used to detect whether the laminated glass reaches the shooting position and the stopping position respectively.

[0016] Furthermore, it also includes an alarm connected to the image processing system, and when the image processing system determines that the trademark is incorrect, the alarm sounds.

[0017] Another technical solution adopted by the present invention is to provide a trademark detection method for automotive laminated glass, the specific steps are as follows:

[0018] S1, adjusting the first camera and the second camera to a suitable trademark detection position;

[0019] S2. When the laminated glass reaches the shooting position, use the first camera and the second camera to respectively shoot images of the upper surface and the lower surface of the glass, and transmit the images to the image processing system;

[0020] S3. The image processing system determines whether there are trademarks printed on the upper and lower surfaces of the glass, and detects the correctness of the trademarks. If the trademark detection is qualified, the laminated glass is transmitted to the next process. If the trademark detection is unqualified, the laminated glass stays for processing.

[0021] Furthermore, the first sensor is used to detect whether the laminated glass reaches the shooting position. When the laminated glass reaches the shooting position, the fill light plate exposes the surface of the laminated glass to assist the camera in capturing images.

[0022] Furthermore, the second sensor is used to detect whether the laminated glass reaches the stop position. When the laminated glass reaches the stop position, the conveyor belt stops and waits for the result of the image processing system. If the trademark detection is correct, the conveyor belt starts. If the trademark detection is incorrect, the alarm sounds.

[0023] The beneficial effects of the trademark detection system and detection method of automobile laminated glass of the present invention are:

[0024] 1. Use two cameras, upper and lower, to shoot the trademark detection position, and use the image processing system to identify whether there is a trademark on the glass and the correctness of the trademark, so as to realize the automation of trademark detection, greatly improve the detection efficiency, and reduce the time of manual intervention and waiting;

[0025] 2. Through automated detection methods and image processing algorithms, it can accurately identify trademark details on the glass and reduce the misjudgment rate;

[0026] 3. The camera has horizontal movement function, which is suitable for different glass sizes and trademark printing positions, and can meet different inspection needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional diagram of a trademark detection system for automotive laminated glass according to a first embodiment of the present invention;

[0028] Figure 2 1 is a front view of a trademark detection system for automotive laminated glass according to a first embodiment of the present invention;

[0029] Figure 3 1 is a side view of a trademark detection system for automotive laminated glass according to a first embodiment of the present invention;

[0030] The components in the accompanying drawings are marked as follows: 1. frame, 2. conveyor belt, 3. first camera, 4. second camera, 5. laminated glass, 11. first guide rail, 12. second guide rail, 13. display screen, 14. warning light, 15. control knob, 31. fill light board. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", "horizontal", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention. They cannot indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0033] See also Figures 1 to 3 , the first embodiment of the present invention provides a trademark detection system for automotive laminated glass 5, comprising: a frame 1, a conveyor belt 2, a first camera 3, a second camera 4, an image processing system, a first sensor, a second sensor, a display screen 13, an alarm and a warning light 14;

[0034] The conveyor belt 2 is arranged on the frame 1 and is used to convey the laminated glass 5;

[0035] The first camera 3 and the second camera 4 are respectively arranged above and below the conveyor belt 2, and are used to photograph the upper surface image and the lower surface image of the laminated glass 5, respectively. Both cameras can be horizontally moved along the conveying direction of the vertical conveyor belt 2, so as to be adjusted to a suitable position to photograph the trademark;

[0036] The image processing system is connected to the first camera 3 and the second camera 4, receives and processes the upper surface image and the lower surface image of the glass, determines whether there is a trademark in the image, whether the trademark is accurate, and whether the trademark is on the correct side, so as to detect whether the trademark is qualified;

[0037] The first sensor and the second sensor are sequentially arranged on one side of the conveyor belt 2 along the conveying direction of the conveyor belt 2, and are used to detect whether the laminated glass 5 reaches the shooting position and the stopping position, respectively, so as to trigger the shooting action and the stopping action of the conveyor belt 2;

[0038] The display screen 13 is connected to the image processing system, and the left and right windows thereof respectively display the processed upper surface image and lower surface image, which the staff can view in real time;

[0039] The alarm and warning light 14 are arranged on the frame 1, and are used to send out an alarm and a warning when the trademark is unqualified, so as to remind the staff to check;

[0040] The control knob 15 is arranged on the frame 1, and includes a first knob and a second knob. The first knob is used to start the conveyor belt 2. After removing the unqualified laminated glass 5, the staff uses the first knob to continue the inspection work. The second knob is used to identify the type of this inspection as upper inspection or lower inspection. If the inspection is upper inspection, the trademark should be on the upper surface, otherwise, the trademark should be on the lower surface, providing a basis for the judgment of the image processing system.

[0041] Specifically, the first camera 3 is set on the frame 1 through the first guide rail 11, and is controlled by the first driving mechanism to move in the horizontal direction. The second camera 4 is set on the frame 1 through the second guide rail 12, and is controlled by the second driving mechanism to move in the horizontal direction. The trademark detection position on the laminated glass 5 is adapted by adjusting the positions of the two cameras in the horizontal direction.

[0042] Specifically, both the first driving mechanism and the second driving mechanism are integrated with a position feedback device to achieve precise positioning of the camera.

[0043] In order to ensure the image quality of the camera, a fill light panel 31 is provided at the shooting end of the two cameras:

[0044] Taking the first camera 3 as an example, the first camera 3 is arranged in a square tube, with its shooting end facing out of the tube mouth. A fill light plate 31 is fixed to the tube mouth of the square tube, and a circular through hole is provided on the fill light plate 31 to avoid blocking the camera lens;

[0045] The first sensor detects the laminated glass 5, and the light sources in the two fill light panels 31 expose and reflect the trademark on the glass. After the light source is turned on, the first camera 3 and the second camera 4 shoot immediately. If the trademark is on the upper surface, at the same exposure, the upper camera can capture the reflected trademark, and the lower camera cannot capture the trademark exposure due to a layer of PVB.

[0046] Specifically, the first camera 3 and the second camera 4 are both high-resolution industrial cameras, so as to be able to clearly capture minute details on the glass surface, including features such as the edge and color of the trademark.

[0047] Specifically, the square tube is fixed to the slider of the corresponding guide rail through a connector. The square tube and the connector can be fixedly connected so that the lower tube opening of the square tube is vertically downward, or can be rotatably connected so that the angle of the lower tube opening of the square tube is adjustable.

[0048] During the use of the system, the sunlight in the production environment will also affect the camera's shooting, resulting in missed detections and false detections and alarms. Later, a sunshade was installed on the top of rack 1 to achieve a stable detection effect:

[0049] Three sunshade fixing rods are installed on the top of the frame 1, and sunshades are set on them to reduce the influence of sunlight on shooting, ensure the accuracy of shooting, and enable the image processing system to effectively obtain the trademark pattern.

[0050] The image processing system includes a real-time image processing unit and a feature extraction and matching unit. The real-time image processing unit is used to preprocess the upper surface image and the lower surface image. The feature extraction and matching unit is used to extract trademark image features and match them with preset templates to determine the existence and correctness of the trademark.

[0051] Specifically, the real-time image processing unit uses an image processing algorithm to perform denoising, contrast enhancement and edge detection on the received upper surface image and lower surface image, making them easier for the next step of feature extraction and matching.

[0052] Specifically, the feature extraction and matching unit uses a machine learning method to extract features from the upper surface image and the lower surface image, and matches them with a preset trademark template to determine whether the correct trademark is printed on the glass.

[0053] The first embodiment of the present invention further provides a method for detecting a trademark of a laminated glass for an automobile, and the specific steps are as follows:

[0054] S1, adjusting the first camera and the second camera to a suitable trademark detection position;

[0055] S2, the conveyor belt conveys the laminated glass. When the first sensor detects the laminated glass, the fill light board fills the light, and then the first camera and the second camera take images of the upper and lower surfaces of the glass and transmit them to the image processing system;

[0056] S3, when the second sensor detects the laminated glass, the conveyor belt stops and waits for the result of the image processing system;

[0057] S4, the image processing system determines whether the upper and lower surfaces of the glass are printed with trademarks, detects the correctness of the trademarks, and determines whether the trademarks are on the correct side. If the trademarks are on the correct side and the trademarks are correct, it is determined to be qualified, and the conveyor belt starts to convey the laminated glass to the next process, while conveying the next piece of laminated glass;

[0058] S5. If it is unqualified, the laminated glass will be kept for processing, the alarm will sound, and the warning light will be on;

[0059] S6. After the staff takes away the unqualified laminated glass, they press the first knob, the conveyor belt starts, and the inspection continues.

[0060] Take the above inspection as an example:

[0061] When there is a trademark on the upper surface of the laminated glass but no trademark on the lower surface, and the trademark on the upper surface is correct, it is judged to be qualified, and the conveyor belt conveys the next piece of laminated glass;

[0062] Other situations, such as having a trademark on the upper surface but the trademark is incorrect, having trademarks on both the upper and lower surfaces, or having no trademark on the upper surface, are all judged as unqualified, the conveyor belt stops, the alarm sounds, and the warning light comes on.

[0063] In this system, the control function is integrated into the image processing system, and an independent control unit can also be set up to control the start and stop of the fill light, the shooting of the camera, the start and stop of the conveyor belt, and the start and stop of the alarm and warning light according to the signals of the first sensor and the second sensor and the results of the image processing system.

[0064] The beneficial effects of the trademark detection system and detection method of automobile laminated glass of the present invention are:

[0065] 1. Use two cameras, upper and lower, to shoot the trademark detection position, and use the image processing system to identify whether there is a trademark on the glass and the correctness of the trademark, so as to realize the automation of trademark detection, greatly improve the detection efficiency, and reduce the time of manual intervention and waiting;

[0066] 2. Through automated detection methods and image processing algorithms, it can accurately identify trademark details on the glass and reduce the misjudgment rate;

[0067] 3. The camera has horizontal movement function, which is suitable for different glass sizes and trademark printing positions, and can meet different inspection needs.

[0068] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A trademark detection system for automotive laminated glass, characterized in that: include: A frame, on which a conveyor belt is arranged for conveying laminated glass; The first camera is arranged above the conveyor belt and is used to capture the upper surface image of the laminated glass, and can move horizontally along the conveying direction of the vertical conveyor belt; The second camera is arranged below the conveyor belt and is used to take an image of the lower surface of the laminated glass. The camera can move horizontally along the conveying direction of the vertical conveyor belt. The image processing system is connected to the first camera and the second camera, receives and processes the upper surface image and the lower surface image of the glass, determines whether the upper surface and the lower surface of the laminated glass are printed with trademarks, and detects whether the trademarks are qualified.

2. A trademark detection system and detection method for automotive laminated glass according to claim 1, characterized in that: The first camera is arranged on the frame via a first guide rail and is controlled to move in a horizontal direction by a first driving mechanism. The second camera is arranged on the frame via a second guide rail and is controlled to move in a horizontal direction by a second driving mechanism.

3. A trademark detection system and detection method for automotive laminated glass according to claim 2, characterized in that: The first driving mechanism and the second driving mechanism are both integrated with a position feedback device.

4. A trademark detection system and detection method for automotive laminated glass according to any one of claims 1 to 3, characterized in that: The first camera and the second camera are both high-resolution industrial cameras, and the shooting ends thereof are both provided with fill light panels for exposing the trademark on the surface of the laminated glass.

5. A trademark detection system and method for automotive laminated glass according to claim 4, characterized in that: The image processing system includes a real-time image processing unit and a feature extraction and matching unit. The real-time image processing unit is used to preprocess the upper surface image and the lower surface image. The feature extraction and matching unit is used to extract trademark image features and match them with preset templates to determine the existence and correctness of the trademark.

6. A trademark detection system and method for automotive laminated glass according to claim 5, characterized in that: It also includes a first sensor and a second sensor, which are sequentially arranged on one side of the conveyor belt along the conveying direction of the conveyor belt and are used to detect whether the laminated glass reaches the shooting position and the stopping position respectively.

7. A trademark detection system and method for automotive laminated glass according to claim 6, characterized in that: The utility model also comprises an alarm which is connected with the image processing system. When the image processing system determines that the trademark is incorrect, the alarm sounds.

8. A method for detecting trademarks of automotive laminated glass, characterized in that: The specific steps are as follows: S1, adjusting the first camera and the second camera to a suitable trademark detection position; S2. When the laminated glass reaches the shooting position, use the first camera and the second camera to respectively shoot images of the upper surface and the lower surface of the glass, and transmit the images to the image processing system; S3. The image processing system determines whether there are trademarks printed on the upper and lower surfaces of the glass, and detects the correctness of the trademarks. If the trademark detection is qualified, the laminated glass is transmitted to the next process. If the trademark detection is unqualified, the laminated glass stays for processing.

9. A trademark detection system and method for automotive laminated glass according to claim 8, characterized in that: The first sensor is used to detect whether the laminated glass reaches the shooting position. When the laminated glass reaches the shooting position, the fill light plate exposes the surface of the laminated glass to assist the camera in shooting images.

10. A trademark detection system and method for automotive laminated glass according to claim 9, characterized in that: The second sensor is used to detect whether the laminated glass reaches the stop position. When the laminated glass reaches the stop position, the conveyor belt stops and waits for the result of the image processing system. If the trademark detection is qualified, the conveyor belt starts, if not, the alarm sounds.

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