Online surface defect detection method based on photometric stereo method
A photometric three-dimensional, defect detection technology, applied in optical testing flaws/defects, measuring devices, material analysis by optical means, etc. Simple structure and good robustness
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[0018] The present invention designs an online surface defect detection method based on the photometric stereo method. During the detection process, the measured part can move in the assembly line, and the surface curvature map of the part (including two-dimensional and three-dimensional information of the surface of the part) can be quickly obtained. , defect information can be extracted by image processing algorithm. The device used is composed of three parts: camera, conveyor belt and light source. During the inspection process, the parts continue to move with the conveyor belt. When they reach the inspection area, the light sources distributed around the inspection area light up in a cycle, and the camera simultaneously takes photos under the lighting conditions of light sources in different directions. During the whole process, the parts continue to move with the conveyor belt. Since the position of the parts has moved during the process of taking different pictures, it i...
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