Instrumentation, Measurement, and Metrology

Accurate calibration method for a structured light system

[+] Author Affiliations
Zhongwei Li

Huazhong University of Science and Technology, State Key Laboratory of Material Processing and Die & Mould Technology, Wuhan, 430074, China

Yusheng Shi

Huazhong University of Science and Technology, State Key Laboratory of Material Processing and Die & Mould Technology, Wuhan, 430074, China

Congjun Wang, Yuanyuan Wang

Huazhong University of Science and Technology, State Key Laboratory of Material Processing and Die & Mould Technology, Wuhan, 430074, China

Opt. Eng. 47(5), 053604 (May 29, 2008). doi:10.1117/1.2931517
History: Received December 27, 2007; Revised February 27, 2008; Accepted March 04, 2008; Published May 29, 2008
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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.

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© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Zhongwei Li ; Yusheng Shi ; Congjun Wang and Yuanyuan Wang
"Accurate calibration method for a structured light system", Opt. Eng. 47(5), 053604 (May 29, 2008). ; http://dx.doi.org/10.1117/1.2931517


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