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Optical Engineering

Accurate calibration method for a structured light system
Author(s): Zhongwei Li; Yusheng Shi; Congjun Wang; Yuanyuan Wang
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Paper Abstract

System calibration is crucial for any 3-D shape measurement system. An accurate method is proposed to calibrate a 3-D shape measurement system based on a structured light technique. The projector is treated as a camera to unify the calibration procedures of a structured light system and a well-established stereo vision system. The key to realizing this method is to establish a highly accurate correspondence between camera pixels and projector pixels and generate digital micromirror device (DMD) image sets for projector calibration. A phase-shifting method is used to accomplish this task. A precalibrated lookup table and a linear interpolation algorithm are proposed to improve the accuracy of the generated DMD image, and accordingly improve the accuracy of the projector calibration and the 3-D measurement. Some experimental results are presented to demonstrate the performance of the system calibration.

Paper Details

Date Published: 1 May 2008
PDF: 9 pages
Opt. Eng. 47(5) 053604 doi: 10.1117/1.2931517
Published in: Optical Engineering Volume 47, Issue 5
Show Author Affiliations
Zhongwei Li, Huazhong Univ. of Science and Technology (China)
Yusheng Shi, Huazhong Univ. of Science and Technology (China)
Congjun Wang, Huazhong Univ. of Science and Technology (China)
Yuanyuan Wang, Huazhong Univ. of Science and Technology (China)

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