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Proceedings Paper

3D detection technique of surface defects for heavy rail based on binocular stereo vision
Author(s): Ke Xu; Peng Zhou; Chaofan Hu
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Paper Abstract

The large number of scales on steel rails makes it impossible to apply traditional 2-D vision techniques to surface inspection of steel rails. A 3-D detection technique based on binocular stereo vision was developed to detect surface defects of steel rails. Laser stripes emitted by linear lasers were projected on the surface of steel rails, and images of laser lines were captured synchronously with two CCD cameras. Standard curves on heavy rails were obtained by adopting segment fitting method. Depth of the defects was calculated by matching points which were obtained respectively from the deepest defect point and its corresponding point on the standard curve. The examination showed that the error of the defect depth with the technique is 3.5%, and it is insensitive to vibration of steel rails during production. Thus the technique is applicable to on-line surface inspection of steel rails.

Paper Details

Date Published: 15 October 2012
PDF: 5 pages
Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 841707 (15 October 2012); doi: 10.1117/12.979738
Show Author Affiliations
Ke Xu, Univ. of Science and Technology Beijing (China)
Peng Zhou, Univ. of Science and Technology Beijing (China)
Chaofan Hu, Univ. of Science and Technology Beijing (China)


Published in SPIE Proceedings Vol. 8417:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; Libin Xiang; Sandy To, Editor(s)

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