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Abstract: The problem associated with calibrating a
structured-light-stripe vision sensor is that known world points on the
calibration target do not normally fall onto the light stripe plane
illuminated from the projector. To address this problem, a method basing
on the invariance of double cross ratio is proposed for calibrating
structured-light-stripe vision sensor, and the calibration target is
designed. By this method, arbitrary amount of 3D world calibration
points on the structured light plane can be easily obtained, thus the
problem that it is difficult to obtain adequate 3D world calibration
points is settled and the calibration accuracy of
structured-light-stripe vision sensor is definitely improved. The
experiments conducted suggest that the proposed calibration method is of
high accuracy and is applicable to many structured light based 3D visual
inspection tasks about large workpieces.
Key words: Invariance of double cross ratio Structured-light-stripe
vision sensor Calibration Visual inspection
CLC No: TP242.62
教育部跨世纪优秀人才培养计划基金和国家杰出青年科学基金资助项目(50125518).
Received 20040619, received in revised form 20020041030
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