Vehicle detection system based on machine vision

Abstract

The invention relates to the technical field of visual inspection, and discloses a vehicle inspection system based on machine vision, comprising an inspection platform, a host computer, and a chassis image acquisition device, an engine compartment image acquisition device, a cockpit image acquisition device, and a whole vehicle image acquisition device, which are electrically connected to the host computer respectively. The hole spacing of the automobile chassis and the engine is measured by a CCD area array camera, and the deformation degree of the vehicle is judged according to the comparison between the hole spacing and a standard value. The system has the advantages of low cost, high precision, and easy installation, and is simple to operate, convenient to use, and high precision. The system has the characteristics of non-contact, real-time, flexibility, and accuracy, and can effectively solve the problems existing in traditional inspection methods, reduce the workload of inspection personnel, and improve the efficiency and precision of vehicle inspection.

Description

Technical Field

[0001] The present invention relates to the technical field of visual detection, and in particular to a vehicle detection system based on machine vision. Background Art

[0002] At present, traditional vehicle defect detection and evaluation generally uses human visual observation to find out the defects of the vehicle and rely on experience to evaluate the deformation of the vehicle. In this way, the workload of the inspectors is large, the speed is slow, the efficiency is high, and the labor cost is high. The error is large, the measurement data cannot be processed in time, and the deformation of the vehicle cannot be accurately evaluated, and thus it is impossible to accurately identify whether it is an accident vehicle. Summary of the invention

[0003] The main purpose of the present invention is to propose a vehicle detection system based on machine vision, which aims to solve the technical problem that the existing vehicle detection relies on experience to evaluate the vehicle deformation, has large errors, cannot accurately evaluate the vehicle deformation, and thus cannot accurately identify whether it is an accident vehicle.

[0004] To achieve the above-mentioned purpose, the vehicle detection system based on machine vision proposed in the present invention includes a detection platform, a chassis image acquisition device and a host computer, the host computer is provided with an image processing module and a motion control module, a supporting device is provided in parallel on both sides of the detection platform, the chassis image acquisition device includes an AGV trolley, a navigation magnetic strip, a first electric slide, a second electric slide, a first mounting plate, a CCD area array camera and a ring light source, the navigation magnetic strip is arranged in an elliptical structure at the bottom between the two supporting devices, the first electric slide is vertically arranged on both sides of the rear end wall of the AGV trolley, the two ends of the second electric slide are respectively connected to the first electric slide, the second electric slide is driven to slide up and down by the first electric slide, the first mounting plate is arranged on the second electric slide, the CCD area array camera It is vertically arranged on the first mounting plate, the annular light source is arranged above the CCD area array camera, and the CCD area array camera is driven to slide left and right by the second electric slide. A controller, a storage module and a wireless communication module are arranged in the AGV trolley. A precision positioning scanning camera is arranged on the front end wall of the AGV trolley, and a positioning mark is arranged on the detection platform. The precision positioning scanning camera can pass over the positioning mark and identify the position information on the positioning mark. The first electric slide, the second electric slide, the CCD area array camera, the storage module and the wireless communication module are electrically connected to the controller respectively, and the host computer is wirelessly connected to the AGV trolley. The CCD area array camera is driven by the AGV trolley and the navigation magnetic strip to collect at least two images of the chassis of the vehicle to be inspected parked on the supporting device.

[0005] Furthermore, it also includes an engine compartment image acquisition device, which includes a first mounting frame, a fourth electric slide, a fifth electric slide, a sixth electric slide, a second mounting plate and a CCD area array camera. The first mounting frame is arranged in a "J" shape on one side of the detection platform, the fourth electric slide is arranged on the top of the first mounting frame, one end of the fifth electric slide is horizontally and vertically connected to the fourth electric slide, the sixth electric slide is vertically arranged at one end of the fifth electric slide, the second mounting plate is vertically arranged on the sixth electric slide, and the CCD area array camera is arranged on the second mounting plate, and the second mounting plate is driven to slide forward and backward, left and right, and up and down through the fourth electric slide, the fifth electric slide and the sixth electric slide respectively.

[0006] Furthermore, it also includes a cockpit image acquisition device, which includes a second mounting frame, a seventh electric slide, an eighth electric slide, a rotation drive motor, a third mounting plate and a CCD area array camera. The second mounting frame is vertically arranged on one side of the detection platform, the seventh electric slide is vertically arranged on the upper end of the second mounting frame, one end of the eighth electric slide is horizontally and vertically arranged on the seventh electric slide, the rotation drive motor is arranged on the eighth electric slide, one end of the third mounting plate is connected to the rotation drive motor, and the CCD area array camera is arranged on the third mounting plate. The third mounting plate is driven to slide up and down, left and right, and rotate through the seventh electric slide, the eighth electric slide and the rotation drive motor respectively.

[0007] Furthermore, it also includes a whole vehicle image acquisition device, which includes a third mounting bracket and a CCD area array camera. The third mounting bracket is vertically arranged on one side of the detection platform, and the upper end of the third mounting bracket is located above the detection platform. The CCD area array camera is arranged at the upper end of the third bracket.

[0008] Furthermore, it also includes a laser ranging sensor, which is arranged at the upper end of the first mounting plate.

[0009] Furthermore, the CCD area array camera adopts a 20-megapixel CMOS industrial CCD area array camera, and the resolution of the CCD area array camera is 0.02 mm.

[0010] The technical solution of the present invention has the following beneficial effects: the technical solution of the present invention measures the hole spacing of the automobile chassis and the engine through a CCD area array camera, and judges the degree of deformation of the vehicle based on the comparison of the hole spacing with the standard value, and has the advantages of low cost, high precision, and easy installation, simple operation, convenient use, and high precision. Its non-contact, real-time, flexible and accurate characteristics can effectively solve the problems existing in traditional detection methods, reduce the workload of detection personnel, and improve the efficiency and accuracy of vehicle detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0012] Figure 1 A schematic diagram of the overall structure of a vehicle detection system based on machine vision according to an embodiment of the present invention;

[0013] Figure 2 A partial structural schematic diagram of a chassis image acquisition device of a vehicle detection system based on machine vision according to an embodiment of the present invention;

[0014] Figure 3 It is another partial structural schematic diagram of a chassis image acquisition device of a vehicle detection system based on machine vision according to an embodiment of the present invention;

[0015] Figure 4 It is another partial structural schematic diagram of a chassis image acquisition device of a vehicle detection system based on machine vision according to an embodiment of the present invention;

[0016] Figure 5 This is a structural schematic diagram of an engine compartment image acquisition device of a vehicle detection system based on machine vision according to an embodiment of the present invention;

[0017] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0018] Figure 7 This is a structural schematic diagram of a cockpit image acquisition device of a vehicle detection system based on machine vision according to an embodiment of the present invention;

[0019] Figure 8 The present invention is a schematic structural diagram of a whole vehicle image acquisition device of a vehicle detection system based on machine vision according to an embodiment of the present invention.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] 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.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The invention provides a vehicle detection system based on machine vision.

[0025] like Figures 1 to 8As shown, in one embodiment of the present invention, the vehicle detection system based on machine vision includes a detection platform 100, a chassis image acquisition device 200 and a host computer (not shown), the host computer is provided with an image processing module and a motion control module, a support device 101 is provided in parallel on both sides of the detection platform 100, the chassis image acquisition device 200 includes an AGV trolley 201, a navigation magnetic strip 202, a first electric slide 203, a second electric slide 204, a first mounting plate 205, a CCD area array camera 206 and a ring light source 207, the navigation magnetic strip 202 is The elliptical structure is arranged at the bottom between the two supporting devices 101, the first electric slide 203 is respectively vertically arranged on both sides of the rear end wall of the AGV trolley 201, the two ends of the second electric slide 204 are respectively connected to the first electric slide 203, and the second electric slide 204 is driven to slide up and down by the first electric slide 103, the first mounting plate 205 is arranged on the second electric slide 204, the CCD area array camera 206 is vertically arranged on the first mounting plate 205, and the annular light source 207 is arranged on the CCD area array camera 206. The CCD area array camera 206 is driven to slide left and right by the second electric slide 204. The AGV trolley 201 is provided with a controller (not shown), a storage module (not shown) and a wireless communication module (not shown). The front end wall of the AGV trolley 201 is provided with a precise positioning scanning camera 208. A positioning mark (not shown) is provided on the detection platform 100. The precise positioning scanning camera 208 can pass over the positioning mark and identify the position information on the positioning mark to complete the precise positioning. The first electric slide 203, The second electric slide 204, the CCD area array camera 206, the storage module and the wireless communication module are electrically connected to the controller respectively. The host computer is wirelessly connected to the AGV cart 201. The CCD area array camera 206 is driven by the AGV cart 201 and the navigation magnetic strip 202 to collect at least two images of the chassis of the vehicle to be inspected parked on the supporting device 101. The image processing module can obtain the positional relationship between any two images collected by the CCD area array camera 206 through the position information of the precise positioning device, and calculate the distance between specific points on the image.

[0026] Specifically, it also includes an engine compartment image acquisition device 300, which includes a first mounting frame 301, a fourth electric slide 302, a fifth electric slide 303, a sixth electric slide 304, a second mounting plate 305 and a CCD area array camera 306. The first mounting frame 301 is arranged in a "J" shape on one side of the detection platform 100, the fourth electric slide 203 is arranged on the top of the first mounting frame 301, one end of the fifth electric slide 303 is horizontally and vertically connected to the fourth electric slide 302, the sixth electric slide 304 is vertically arranged at one end of the fifth electric slide 303, the second mounting plate 305 is vertically arranged on the sixth electric slide 304, and the CCD area array camera 306 is arranged on the second mounting plate 305, and the second mounting plate 305 is driven to slide forward and backward, left and right, and up and down by the fourth electric slide 302, the fifth electric slide 303 and the sixth electric slide 304 respectively.

[0027] Specifically, it also includes a cockpit image acquisition device 400, which includes a second mounting frame 401, a seventh electric slide 402, an eighth electric slide 403, a rotation drive motor 404, a third mounting plate 405 and a CCD area array camera 406. The second mounting frame 401 is vertically arranged on one side of the detection platform 100, the seventh electric slide 402 is vertically arranged at the upper end of the second mounting frame 401, one end of the eighth electric slide 403 is horizontally and vertically arranged on the seventh electric slide 402, the rotation drive motor 404 is arranged on the eighth electric slide 403, one end of the third mounting plate 405 is connected to the rotation drive motor 404, and the CCD area array camera 406 is arranged on the third mounting plate 405. The third mounting plate 405 is driven to slide up and down, left and right, and rotate through the seventh electric slide 402, the eighth electric slide 403 and the rotation drive motor 404.

[0028] Specifically, it also includes a whole vehicle image acquisition device 500, which includes a third mounting bracket 501 and a CCD area array camera 502. The third mounting bracket 501 is vertically arranged on one side of the detection platform 100, and the upper end of the third mounting bracket 501 is located above the detection platform 100. The CCD area array camera 502 is arranged at the upper end of the third bracket 501.

[0029] Specifically, it also includes a laser ranging sensor 600, which is arranged at the upper end of the first mounting plate 205. The height of the area array camera is adjusted according to the data measured by the laser ranging sensor to ensure the accuracy of the focal length of the area array camera, thereby ensuring the cleanliness of image acquisition and effectively improving the measurement accuracy.

[0030] Specifically, the CCD area array camera 206 adopts a 20-megapixel CMOS industrial CCD area array camera, and the resolution of the CCD area array camera 206 is 0.02 mm.

[0031] During the specific inspection, the car to be inspected is parked above the inspection platform, and the hole distance of the car chassis is measured by the chassis image acquisition device. The CCD area array camera of the chassis image acquisition device carries the camera and the light source along the X-axis and Y-axis of the bottom of the car through the linear motion module to take the initial photo of the car chassis to collect images; after the image acquisition of the car chassis is completed, the second image acquisition is carried out according to the coordinates of the preset hole positions to be measured, and the height of the CCD area array camera is adjusted at each hole position coordinate by the data measured by the laser ranging sensor to ensure the accuracy of the focal length of the CCD area array camera, thereby ensuring the cleanliness of image acquisition and improving the measurement accuracy. After the second image acquisition is completed, The image data is transmitted to the host computer for processing. The corresponding position and coordinate position of each hole are calculated through the preset software algorithm in the host computer, and the comparison result with the standard data is output in real time. When the relative position and coordinate position of the hole are greater than or less than the factory standard value, it is determined to be an accident vehicle model; the engine hole distance is measured by the engine compartment image acquisition device, and the detection method of the engine compartment is the same as that of the chassis; the cockpit image acquisition device is used to acquire images of the vehicle cockpit instrument panel and rear seats, and upload them to the host computer for storage; the whole vehicle image acquisition device is used to acquire images of the measured overall appearance, and upload them to the host computer for storage, and the built-in algorithm is used to complete the evaluation of the degree of vehicle transformation.

[0032] Specifically, the technical solution of the present invention measures the hole spacing of the automobile chassis and engine through a CCD area array camera, and judges the deformation degree of the vehicle by comparing the hole spacing with the standard value. It has the advantages of low cost, high precision, and easy installation. It is simple to operate, easy to use, and has high precision. Its non-contact, real-time, flexible, and accurate characteristics can effectively solve the problems existing in traditional detection methods, reduce the workload of detection personnel, and improve the efficiency and accuracy of vehicle detection.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A vehicle detection system based on machine vision, characterized in that: It includes a detection platform, a chassis image acquisition device and a host computer, the host computer is provided with an image processing module and a motion control module, a supporting device is provided in parallel on both sides of the detection platform, the chassis image acquisition device includes an AGV trolley, a navigation magnetic strip, a first electric slide, a second electric slide, a first mounting plate, a CCD area array camera and a ring light source, the navigation magnetic strip is arranged in an elliptical structure at the bottom between the two supporting devices, the first electric slide is vertically arranged on both sides of the rear end wall of the AGV trolley, the two ends of the second electric slide are respectively connected to the first electric slide, the second electric slide is driven to slide up and down by the first electric slide, the first mounting plate is arranged on the second electric slide, and the CCD area array camera is vertically arranged on the first mounting plate , the annular light source is arranged above the CCD area array camera, and the CCD area array camera is driven to slide left and right by the second electric slide. The AGV trolley is provided with a controller, a storage module and a wireless communication module. The front end wall of the AGV trolley is provided with a precision positioning scanning camera, and a positioning mark is provided on the detection platform. The precision positioning scanning camera can pass over the positioning mark and identify the position information on the positioning mark. The first electric slide, the second electric slide, the CCD area array camera, the storage module and the wireless communication module are electrically connected to the controller respectively, and the host computer is wirelessly connected to the AGV trolley. The CCD area array camera is driven by the AGV trolley and the navigation magnetic strip to collect at least two images of the chassis of the vehicle to be inspected parked on the supporting device; It also includes an engine compartment image acquisition device, which includes a first mounting frame, a fourth electric slide, a fifth electric slide, a sixth electric slide, a second mounting plate and a CCD area array camera, wherein the first mounting frame is arranged in a "J" shape on one side of the detection platform, the fourth electric slide is arranged on the top of the first mounting frame, one end of the fifth electric slide is horizontally and vertically connected to the fourth electric slide, the sixth electric slide is vertically arranged at one end of the fifth electric slide, the second mounting plate is vertically arranged on the sixth electric slide, the CCD area array camera is arranged on the second mounting plate, and the second mounting plate is driven to slide forward and backward, left and right, and up and down through the fourth electric slide, the fifth electric slide and the sixth electric slide respectively; It also includes a cockpit image acquisition device, which includes a second mounting frame, a seventh electric slide, an eighth electric slide, a rotation drive motor, a third mounting plate and a CCD area array camera, wherein the second mounting frame is vertically arranged on one side of the detection platform, the seventh electric slide is vertically arranged on the upper end of the second mounting frame, one end of the eighth electric slide is horizontally and vertically arranged on the seventh electric slide, the rotation drive motor is arranged on the eighth electric slide, one end of the third mounting plate is connected to the rotation drive motor, the CCD area array camera is arranged on the third mounting plate, and the third mounting plate is driven to slide up and down, left and right, and rotate respectively through the seventh electric slide, the eighth electric slide and the rotation drive motor; It also includes a whole vehicle image acquisition device, which includes a third mounting frame and a CCD area array camera. The third mounting frame is vertically arranged on one side of the detection platform, the upper end of the third mounting frame is located above the detection platform, and the CCD area array camera is arranged at the upper end of the third mounting frame.

2. The vehicle detection system based on machine vision according to claim 1, characterized in that: It also includes a laser distance measuring sensor, which is arranged at the upper end of the first mounting plate.

3. The vehicle detection system based on machine vision according to claim 1, characterized in that: The resolution of the CCD area array camera is 0.02 mm.

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