Defect detection and classification on metallic parts

Pierrick Bourgeat; Fabrice Meriaudeau

doi:10.1117/12.460196

8 March 2002 Defect detection and classification on metallic parts

Proceedings Volume 4664, Machine Vision Applications in Industrial Inspection X; (2002) https://doi.org/10.1117/12.460196
Event: Electronic Imaging, 2002, San Jose, California, United States

Abstract

The topic of this research is to the study the feasibility of a machine vision prototype for the control of metallic tubes (used in water pomp). Nine different kinds of defects located everywhere on the tube have to be detected: The defects are: on the top: little hollows, bumps, and excesses of material on the body: horizontal bumps, vertical bumps, vertical scratches and finally on the bottom: vertical ridges, holes, and bumps. As the defects on the top of the tube are very small, a grazing angle is used to light the tube. The camera is set on the opposite side of the tube with the same angle. Hollows and bumps are both detected by a vertical Sobel gradient. For the third defects, the excess of material projects its shadow on the top of the tube, and defects are detected by looking for a dark region instead of a lighted one. To inspect the rest of the tubes, a neon tube with a diffuser is employed to homogeneously light the body and the bottom of the tubes. Association of gradient operators, threshold procedures enables to find all the defects.

Citation Download Citation

Pierrick Bourgeat and Fabrice Meriaudeau "Defect detection and classification on metallic parts", Proc. SPIE 4664, Machine Vision Applications in Industrial Inspection X, (8 March 2002); https://doi.org/10.1117/12.460196

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