CN113030111A - Machine vision-based automotive oil cooler cold joint detection system and method - Google Patents
Machine vision-based automotive oil cooler cold joint detection system and method Download PDFInfo
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Abstract
The utility model discloses a car oil cooler rosin joint detecting system and method based on machine vision, include: the image acquisition device is used for acquiring images before and after stamping of the oil cooler; the cold joint detection module is used for analyzing the images of the oil cooler before and after stamping respectively, acquiring the areas of the gap areas corresponding to the images before and after stamping, and determining the number and the positions of the interlayer gap areas with area changes in the images before and after stamping; and determining the quantity and the positions of the cold joints of the oil cooler according to the quantity and the positions of the interlayer gap areas with changed areas. The accuracy of oil cooler rosin joint detection has been improved.
Description
Technical Field
The invention relates to the technical field of workpiece defect detection, in particular to a machine vision-based automotive oil cooler cold joint detection system and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the rapid development of the modern industrial manufacturing industry technology, the product quantity is larger and larger, and the requirement on the product quality is higher and higher. In the production process of the automobile oil cooler, the workpiece needs to be punched, plastic deformation is easily generated at a cold joint position after the oil cooler is punched, the workpiece is expressed as a bulge in appearance, and whether the workpiece is qualified or not is judged according to the quantity and the size degree of the bulge so as to avoid leakage risks. The traditional detection mode is that the defects are detected manually, the manual detection is influenced by subjective factors, human eyes detect the bulges and record the number and the positions of the bulges, the difficulty is high, fatigue is easy to generate, especially under the condition that the bulges are not obvious enough, the conditions of missed detection and false detection are easy to occur, the detection efficiency and the accuracy rate can not be guaranteed, and the detection speed and the detection efficiency of a production line are influenced.
Disclosure of Invention
The utility model aims at solving the above problem, provide an automobile oil cooler rosin joint detecting system and method based on machine vision, realized the automated inspection to oil cooler rosin joint defect through machine vision, improved oil cooler rosin joint detection's rate of accuracy and efficiency.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
first aspect provides an automobile oil cooler rosin joint detecting system based on machine vision, includes:
the image acquisition device is used for acquiring images before and after stamping of the oil cooler;
the cold joint detection module is used for analyzing the images of the oil cooler before and after stamping respectively, acquiring the areas of the gap areas corresponding to the images before and after stamping, and determining the number and the positions of the interlayer gap areas with area changes in the images before and after stamping; and determining the quantity and the positions of the cold joints of the oil cooler according to the quantity and the positions of the interlayer gap areas with changed areas.
In a second aspect, a machine vision-based method for detecting cold joint of an automobile oil cooler is provided, which comprises the following steps:
collecting images of the oil cooler before and after stamping;
analyzing the images of the oil cooler before and after stamping respectively to obtain the area and the position of a gap region corresponding to the images before and after stamping;
determining the number and the positions of interlayer gap regions with area change in the images before and after stamping;
and determining the quantity and the positions of the cold joints of the oil cooler according to the quantity and the positions of the interlayer gap areas with changed areas.
In a third aspect, an electronic device is provided, which includes a memory, a processor, and computer instructions stored in the memory and executed on the processor, where the computer instructions, when executed by the processor, perform the steps of a machine vision-based cold joint detection method for an automotive oil cooler.
In a fourth aspect, a computer-readable storage medium is provided for storing computer instructions, and the computer instructions, when executed by a processor, perform the steps of a machine vision-based cold joint detection method for an automotive oil cooler.
Compared with the prior art, the beneficial effect of this disclosure is:
1. this openly is arranged in car oil cooler rosin joint with machine vision technique and detects, has realized the automated inspection of car oil cooler rosin joint, through detecting swell quantity and position, and then judges rosin joint quantity and position, compares in traditional artifical the measuring, has improved the security of the efficiency, the rate of accuracy and the assembly line that detect.
2. This openly when carrying out image acquisition to the oil cooler, set up irradiation source and reflector, change image acquisition device's light path through the reflector, realized the image acquisition to the great object of size in narrow space, guaranteed that the work piece formation of image is complete, irradiation source adopts the shape of face backlight, and the contrast of space region and background between the reinforcing layer does benefit to and acquires complete interlaminar space area to guarantee the accuracy that rosin joint detected.
3. The vibration damping devices are arranged on the reflector support and the camera support, and compared with a system without the vibration damping devices, the system with the vibration damping devices is more stable in illumination condition and better in workpiece imaging effect, and the accuracy of detection is guaranteed.
4. The area change threshold of the interlayer gap region is used for judging that the bulge exists only when the area change of the interlayer gap region in the image before and after stamping is larger than or equal to the area change threshold, so that the problems that the interlayer gap region generates small deformation due to stamping operation and the image acquired twice has small difference due to small vibration when the image is acquired, the bulge is judged by mistake are solved, the bulge detection accuracy is effectively guaranteed, and the false welding detection accuracy is further guaranteed.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is an overall structural layout diagram of a system disclosed in embodiment 1 of the present disclosure;
FIG. 2 is a light path direction diagram of the system disclosed in embodiment 1 of the present disclosure;
FIG. 3 is a view of a mirror arrangement of the system disclosed in example 1 of the present disclosure;
FIG. 4 is a view of the mirror support structure of the system disclosed in embodiment 1 of the present disclosure;
fig. 5 is a flow chart of the cold solder joint detection disclosed in embodiment 1 of the present disclosure.
Wherein: 1. touch-sensitive screen, 2, image acquisition device, 3, car oil cooler, 4, reflector, 5, light source, 6, controller, 7, industrial computer, 8, host computer, 9, light path, 10, mounting panel, 11, frame foot, 12, cylinder.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
Example 1
In this embodiment, disclose an automobile oil cooler rosin joint detecting system based on machine vision, include:
the image acquisition device is used for acquiring images before and after stamping of the oil cooler;
the cold joint detection module is used for analyzing the images of the oil cooler before and after stamping respectively, acquiring the areas of the gap areas corresponding to the images before and after stamping, and determining the number and the positions of the interlayer gap areas with area changes in the images before and after stamping; and determining the quantity and the positions of the cold joints of the oil cooler according to the quantity and the positions of the interlayer gap areas with changed areas.
Further, the method also comprises the following steps:
the controller is used for receiving a pressing signal of the pressing oil cooler and a stamping completion signal of the oil cooler and sending the signals to the industrial personal computer;
the industrial personal computer is used for controlling the image acquisition device to acquire images before stamping of the oil cooler when the compaction signal is received, and controlling the image acquisition device to acquire images after stamping of the oil cooler when the stamping completion signal is received;
the upper computer is used for displaying and storing data of collected images before and after stamping of the oil cooler, the areas, the number and the positions of the void regions in the images before and after stamping, the number and the corresponding positions of bulges contained in the oil cooler and the number and the positions of the cold joints;
and the light source system is used for providing a light source for the oil cooler.
Further, the light source system comprises a light source and a reflector, the light source is used for polishing the back of the oil cooler, and the reflector is used for changing the light path of the image acquisition device.
Further, the specific process of the rosin joint detection module determining the area of the interlayer gap region in the image before and after stamping is as follows:
performing image gray correction and transformation on the images before and after stamping to obtain gray images of the images before and after stamping;
respectively carrying out region segmentation and edge extraction on the gray level images of the images before and after stamping, and positioning and extracting interlayer gap regions;
and determining the area of the interlayer gap region in the images before and after stamping according to the positioned and acquired interlayer gap region.
Furthermore, an area change threshold value is set in the cold joint detection module, and only when the area change of the interlayer gap regions in the images before and after stamping is larger than or equal to the area change threshold value, the bulge is judged to exist, the number and the positions of the interlayer gap regions with the area change larger than or equal to the area change threshold value are obtained, and the number and the positions of the cold joint of the oil cooler are determined according to the number and the positions of the interlayer gap regions with the area change larger than or equal to the area change threshold value.
Furthermore, the reflector is fixed on the reflector support, the image acquisition device is fixed on the camera support, and shock pads are arranged at the joints of the reflector support, the camera support and the punching station.
Furthermore, the reflector bracket comprises a bracket plate and a bracket foot, the bracket plate is fixed on the bracket foot, and the bracket foot is of a telescopic structure;
the camera support is a universal camera support.
The automotive oil cooler cold joint detection system based on machine vision disclosed in the present embodiment is described in detail with reference to fig. 1 to 4.
As shown in fig. 1, an automobile oil cooler rosin joint detection system based on machine vision includes: the device comprises an image acquisition device 2, a cold joint detection module, a controller 6, an industrial personal computer 7, an upper computer 8 light source system and a touch screen 1.
Wherein, image acquisition device 2 for gather oil cooler punching press front and back image.
When the device is specifically implemented, the image acquisition device 2 is fixed above a stamped oil cooler workpiece through a camera support to acquire images of the oil cooler before and after stamping.
The image capturing device 2 may be a camera.
The camera support adopts universal camera support, and image acquisition device passes through the bolt fastening on the camera support, and when using, through bolted connection with the camera support be fixed in the oil cooler work piece top of punching press station, for reducing the influence of vibration to image acquisition, set up the shock pad in camera support and punching press station junction, when making image acquisition device, camera support and punching press station keep vibration frequency unanimous, isolated partial vibration through the shock pad.
The cold joint detection module is used for receiving the images acquired by the image acquisition device 2, analyzing the images of the oil cooler before and after stamping, acquiring the areas of the gap areas corresponding to the images before and after stamping, and determining the number and positions of the interlayer gap areas with area changes in the images before and after stamping; determining the number and the positions of bulges contained in the oil cooler according to the number and the positions of the interlayer gap areas with changed areas; and judging the number and the positions of the cold joints according to the number and the positions of the bulges contained in the oil cooler.
When specifically implementing, rosin joint detection module carries out the analysis to oil cooler punching press front and back image, and the specific process of judging rosin joint's quantity and position is:
carrying out image gray correction and transformation on the collected images of the oil cooler before and after stamping to obtain gray images of the images before and after stamping, so as to enhance the contrast between an interlayer gap area and an oil cooler body and facilitate extraction of the gap area;
respectively carrying out region segmentation and edge extraction on the gray level images of the images before and after stamping, and positioning and extracting interlayer gap regions;
identifying the area size (in pixel units) of each interlayer gap region in order to realize the quantization of the area size of the interlayer gap region;
comparing the area of the corresponding interlayer gap region in the images before and after stamping, if a certain region has a false solder, the region will bulge after stamping, the interlayer gap area of the region after stamping will be obviously smaller than the interlayer gap area of the region before stamping, when the change result of the interlayer gap area before and after stamping of the certain region is greater than or equal to a set area change threshold, the region can be considered to have the bulge, and then the region is considered to have the false solder, otherwise, if the change result of the area is smaller than the set area change threshold, the region is considered to have no false solder;
and positioning the number and the positions of the cold joints.
In the embodiment, for the problem that the punching operation may cause the interlayer gap region to generate micro deformation and the problem that the images acquired twice have micro difference due to micro vibration when the images are acquired, when the rosin joint is judged, the area change threshold of the interlayer gap is set, if the difference between the areas of the gaps before and after punching of a certain region is greater than or equal to the area change threshold, the bulge exists, that is, the rosin joint exists, otherwise, when the difference is smaller than the area change threshold, the region is not subjected to the rosin joint, the problem that the bulge is judged by mistake due to the fact that the punching operation causes the interlayer gap region to generate micro deformation and the images acquired twice have micro difference due to micro vibration when the images are acquired is effectively prevented, the accuracy of bulge detection is ensured, and the accuracy of the rosin joint detection is further ensured.
And the controller 6 is used for receiving a pressing signal for pressing the oil cooler and an oil cooler stamping completion signal and sending the signals to the industrial personal computer.
When the oil cooler stamping device is specifically implemented, after an oil cooler workpiece reaches a stamping station, the stamping station can perform positioning and compressing operation on the workpiece, the electromagnetic valve for controlling the compressing operation sends a voltage pulse signal to the controller, the voltage pulse signal is a compressing signal for compressing the oil cooler, and after the workpiece stamping is completed, the electromagnetic valve for controlling the stamping operation sends a pulse signal to the controller again, and the pulse signal is an oil cooler stamping completion signal.
The industrial personal computer 7 receives the pressing signal and the stamping completion signal sent by the controller 6, and collects images of the oil cooler before and after stamping according to the pressing signal and the stamping completion signal.
When the industrial personal computer 7 receives the compaction signal, image acquisition is carried out on the oil cooler, and the image is an image of the oil cooler before stamping.
And after the industrial personal computer 7 receives the stamping completion signal, image acquisition is carried out on the oil cooler again, and the image is an image of the stamped oil cooler.
The upper computer 8 is used for storing and displaying the detection information.
In specific implementation, the information displayed and stored by the upper computer 8 comprises images of the oil cooler before and after stamping, the area of the gap area in the images before and after stamping, whether bulges exist, and the position, the area size and the number of the bulges.
The touch screen 1 is in communication connection with the industrial personal computer 7 and is used for controlling the opening and closing of the image acquisition device 2.
And the light source system is used for providing illumination for the oil cooler workpiece.
In specific implementation, the light source system comprises a light source 5 and a reflective mirror 4, the light path of the image acquisition device 2 is changed through the reflective mirror 4, the light path 9 from the image acquisition device to the oil cooler workpiece through the reflective mirror 4 is shown in fig. 2, the light source 5 adopts a surface-shaped backlight source to polish the back of the oil cooler workpiece, and the contrast between the interlayer gap and the oil cooler is enhanced.
The reflector 4 is fixed by a reflector bracket, the structure of the reflector bracket is shown in fig. 4, and the reflector bracket comprises a bracket plate 10 and a bracket leg 11, the bracket plate 10 is fixed on the bracket leg 11, and the bracket leg 11 is of a telescopic structure.
A plurality of reflector mounting holes are uniformly distributed on the support plate 10, the reflectors are mounted in the reflector mounting holes, the support plate 10 and the frame legs 11 are arranged at an angle, the support plate 10 is connected with the frame legs 11 through bolts, the frame legs 11 are of a telescopic structure, the telescopic structure of the frame legs 11 drives the support plate 10 to move, so that the height of the support plate 10 can be adjusted, in order to prevent the influence of vibration on image acquisition and further influence the accuracy of cold joint judgment, when the reflector bracket is fixed at a stamping station, a shock pad is arranged at the joint of the reflector bracket and the punching station, partial vibration is isolated through the shock pad, and can ensure that the vibration frequency of the reflector bracket is consistent with that of the stamping station, thereby ensuring the stability of the light path 9, and then guaranteed image acquisition's stability for the image analysis is more do benefit to the image acquisition, and then has guaranteed the rate of accuracy that rosin joint detected.
The reflector support sets up to a plurality of, the reflector is established to the equipartition on a plurality of reflector supports, all be used for changing image acquisition device's light path, through setting up a plurality of reflector supports, the reflector on the reflector support changes image acquisition device's light path, when effectively guaranteeing to carry out image acquisition to the great work piece of size, the integrality of the great work piece formation of image of size, the contrast ratio of gap region and background between the shape of face shape backlight reinforcing layer does benefit to and acquires complete interlaminar gap area to the accuracy of rosin joint detection has effectively been guaranteed.
In one embodiment, the angle between the support plate and the frame foot is 45 degrees, the size of the support plate is 140mmX220mm, the basic height of the center of the support plate after installation is 80mm, as shown in fig. 2 and 3, the number of the mirror supports is three, the mirrors on the three mirror supports reflect the light emitted by the image acquisition device, and the reflected light irradiates on the oil cooler workpiece.
The disclosed car oil cooler rosin joint detecting system based on machine vision of this embodiment, the flow that detects is carried out the oil cooler is shown in fig. 5, the conveyer belt conveys the oil cooler work piece to behind the punching press station, image acquisition device is automatic to the image acquisition around the work piece punching press, rosin joint detection module is according to the image of gathering, accomplish the regional extraction in interpair gap, division and area size detect, and compare two image same position air gap regional sizes around same work piece punching press, if the contrast result in certain region exceeds the area change threshold value of settlement, then can think that this region has the swell, and then it has the rosin joint to think this region. The system can realize full-automatic detection of the insufficient solder joint defect of the oil cooler on the production line, and automatically record the detection result for guiding the elimination of the defective products.
Aiming at the problems that the station space is narrow, the size of an object to be detected is large and the imaging of a workpiece is affected, the reflector is designed for changing the light path direction of the image acquisition device, prolonging the length of the light path, realizing the image acquisition of the object with the large size in a narrow space, ensuring the complete imaging of the workpiece, enhancing the contrast ratio of an interlayer gap area and a background by the surface-shaped backlight source, being beneficial to obtaining the complete interlayer gap area and ensuring the accuracy of the false welding detection.
When the reflector support and the camera support are fixed on the punching station, the shock absorption pads are arranged among the reflector support, the camera support and the punching station, so that the stability of illumination and image acquisition is effectively guaranteed, the workpiece imaging effect is better, and the accuracy of rosin joint detection is guaranteed.
This openly is arranged in car oil cooler rosin joint with machine vision technique and detects, has realized the automated inspection of car oil cooler rosin joint, through detecting swell quantity and position, and then judges rosin joint quantity and position, compares in traditional artifical the measuring, has improved the security of the efficiency, the rate of accuracy and the assembly line that detect.
Example 2
In the embodiment, a machine vision-based method for detecting cold joint of an automobile oil cooler is disclosed, which comprises the following steps:
collecting images of the oil cooler before and after stamping;
analyzing the images of the oil cooler before and after stamping respectively to obtain the area and the position of a gap region corresponding to the images before and after stamping;
determining the number and the positions of interlayer gap regions with area change in the images before and after stamping;
and determining the quantity and the positions of the cold joints of the oil cooler according to the quantity and the positions of the interlayer gap areas with changed areas.
Example 3
In this embodiment, an electronic device is disclosed, which includes a memory, a processor, and computer instructions stored in the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the steps of the method for detecting cold joint of an automotive oil cooler based on machine vision disclosed in embodiment 2.
Example 4
In this embodiment, a computer readable storage medium is disclosed for storing computer instructions, and the computer instructions, when executed by a processor, perform the steps of the method for detecting cold joint of an automotive oil cooler based on machine vision disclosed in embodiment 2.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. The utility model provides an automobile oil cooler rosin joint detecting system based on machine vision, its characterized in that includes:
the image acquisition device is used for acquiring images before and after stamping of the oil cooler;
the cold joint detection module is used for analyzing the images of the oil cooler before and after stamping respectively, acquiring the areas of the gap areas corresponding to the images before and after stamping, and determining the number and the positions of the interlayer gap areas with area changes in the images before and after stamping; and determining the quantity and the positions of the cold joints of the oil cooler according to the quantity and the positions of the interlayer gap areas with changed areas.
2. The machine vision-based automotive oil cooler cold joint detection system of claim 1, further comprising:
the controller is used for receiving a pressing signal of the pressing oil cooler and a stamping completion signal of the oil cooler and sending the signals to the industrial personal computer;
the industrial personal computer is used for controlling the image acquisition device to acquire images before stamping of the oil cooler when the compaction signal is received, and controlling the image acquisition device to acquire images after stamping of the oil cooler when the stamping completion signal is received;
the upper computer is used for displaying and storing the acquired images of the oil cooler before and after stamping, the areas of the hollow areas in the images before and after stamping and the detection results of the cold joint of the oil cooler;
and the light source system is used for providing illumination for the oil cooler.
3. The machine vision-based automotive oil cooler cold joint detection system of claim 2, wherein the light source system comprises an illumination light source and a reflector, the light source is used for shining light to the back surface of the oil cooler, and the reflector is used for changing the light path of the image acquisition device.
4. The machine vision-based automotive oil cooler rosin joint detection system of claim 3, wherein the mirror is fixed to a mirror support, the image capture device is fixed to a camera support, and shock pads are disposed at the connection of the mirror support and the camera support to the stamping station.
5. The machine vision-based automotive oil cooler rosin joint detection system according to claim 4, wherein the reflector bracket comprises a bracket plate and a bracket leg, the bracket plate is fixed on the bracket leg, and the bracket leg is of a telescopic structure;
the camera support is a universal camera support.
6. The machine vision-based automotive oil cooler cold joint detection system of claim 1, wherein the cold joint detection module determines the area of the interlayer gap region in the images before and after stamping by a specific process comprising:
performing image gray correction and transformation on the images before and after stamping to obtain gray images of the images before and after stamping;
respectively carrying out region segmentation and edge extraction on the gray level images of the images before and after stamping, and positioning and extracting interlayer gap regions;
and determining the area of the interlayer gap region in the images before and after stamping according to the positioned and acquired interlayer gap region.
7. The machine vision-based automotive oil cooler cold joint detection system as claimed in claim 1, wherein an area change threshold is set in the cold joint detection module, only when the area change of the interlayer void regions in the images before and after stamping is greater than or equal to the area change threshold, it is determined that a bulge exists, the number and positions of the interlayer void regions for which the area change is greater than or equal to the area change threshold are obtained, and the number and positions of the cold joints of the oil cooler are determined according to the number and positions of the interlayer void regions for which the area change is greater than or equal to the area change threshold.
8. A machine vision-based cold joint detection method for an automobile oil cooler is characterized by comprising the following steps:
collecting images of the oil cooler before and after stamping;
analyzing the images of the oil cooler before and after stamping respectively to obtain the area and the position of a gap region corresponding to the images before and after stamping;
determining the number and the positions of interlayer gap regions with area change in the images before and after stamping;
and determining the quantity and the positions of the cold joints of the oil cooler according to the quantity and the positions of the interlayer gap areas with changed areas.
9. An electronic device comprising a memory and a processor, and computer instructions stored in the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the steps of the machine vision-based cold-joint detection method for an automotive oil cooler according to claim 8.
10. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of the machine vision-based cold-joint detection method for an automotive oil cooler of claim 8.
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