Auto part quality detection method based on shape match

Abstract

The invention relates to an auto part defect recognition method based on similarity match. The method has functions of detecting a leakage welding point, a leakage small part, a leakage nut and a leakage punching hole on the auto parts, and the detection objects are a welding point, a small part, a nut and a punching hole. The method comprises realization steps: firstly, an auto part image is acquired, and whether a template library needs to be built is judged; then, a detection area is captured on the acquired image, and image preprocessing is carried out on the area; then, template images ina detection object template library are traversed, the template images and the image after pre-processing are subjected to scanning and similarity contrast, a contrast result is saved to a cue map, and all information of the detection objects is included in the cue map; and finally, contour detection processing is carried out on the cue map, a contour perimeter, a roundness and an area are used to select a detection object, the contour number and position information is acquired, and whether defects of a leakage welding point, a leakage small part, a leakage nut or a leakage punching hole exist on the auto part in the acquired image can be detected.

Description

technical field [0001] The invention relates to image processing technology, in particular to a quality inspection method for auto parts based on shape matching. Background technique [0002] A car is composed of tens of thousands of parts, including car body assembly parts and plastic parts, which account for a large proportion of the car. Automobile OEMs have very high requirements for the quality of their products. For distribution manufacturers, the key parts of the auto parts are required to have a pass rate of 100%, and other auto parts are basically required to reach 99.99%. For the first-tier suppliers, the requirements within 100ppm, and 200-400ppm for other secondary and tertiary suppliers. Therefore, whether the auto parts are qualified or not directly affects the automobile main engine factory, and the auto parts manufacturers must spend a lot of manpower on inspection and investigation. [0003] From the perspective of the automobile market, at present, domest...

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Problems solved by technology

[0003] From the perspective of the automobile market, at present, domestic small and medium-sized enterprises mainly rely on manual inspection, which is time-consuming and labor-intensive and may miss inspection. In view of the above-mentioned situation in the domestic automobile industry, the research and development of the auto parts visual inspection system is to solve the problems of low inspection efficiency, large number of personnel, and Detection of low quality issues

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