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5 September 2002 Optical-probe-imaging-based stereo cameras 3D coordinate measuring system
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An optical probe imaging based, fully automatic and rather flexible stereo vision system for 3D coordinate on-line measurement is presented and analyzed. In this system, the relative position of the two cameras can easily be calibrated by observing an optical reference bar in different locations and orientations through the measurement according to epipolar constraint and the certified distance of the features on the reference bar. For measurement, the system takes an optical probe, which has one reference mark and five optical feature points, as imaging target, and makes use of the measurement results of these feature points space coordinates to calculate the measured object point coordinate which contacts with probe tip. To improve the calibration and measurement accuracy, the system takes infrared LED as optical feature point, and optimized signal to noise ratio by automatic LED light intensity, located these feature imaging points by bilinear centroid sub-pixel algorithm. The effectiveness of the proposed system has been test by experiments.
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Zhijing Yu, Gang Chen, Rensheng Che, Chang-ying Liu, Qingcheng Huang, Shuying Ma, and Wei Tian "Optical-probe-imaging-based stereo cameras 3D coordinate measuring system", Proc. SPIE 4921, Optical Manufacturing Technologies, (5 September 2002);

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