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Proceedings Paper

Heterodyne multi-frequency method for 3D profile measurement
Author(s): Xiaoping Lou; Naiguang Lv; Peng Sun; Fengxia Duan; Yimin Lin
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Paper Abstract

A binocular structured light measurement system using heterodyne multi-frequency method is researched in this paper. Three steps must be done to recover 3D profile information: cameras calibration; points matching; 3D information reconstruction. The intrinsic and extrinsic parameters of cameras are calibrated by Zhengyou Zhan's method [1]. Stereo vision model is the basic rule of 3D recovering. Techniques of phase shift and heterodyne multi-frequency are used to aid points matching. Some coded digital fringes are projected to the free-form surfaces and corresponding images are captured by two cameras simultaneously. The wrapped phase map is obtained through four-step phase shift. In a single cycle, phase value is calculated using arctangent function and it is between -π and π. The heterodyne multi-frequency method is applied to get the absolute phase map. When the number of frequencies is changed from 2 to 3, or 4, the unwrapping accuracy and matching results are improved. The processing theory and experimental results are illustrated and analyzed. The experimental results show that accurate and reliable phase result can be obtained on phase map boundaries and break points, which proves its feasibility in industrial situations.

Paper Details

Date Published: 27 May 2011
PDF: 7 pages
Proc. SPIE 7997, Fourth International Seminar on Modern Cutting and Measurement Engineering, 799724 (27 May 2011); doi: 10.1117/12.890151
Show Author Affiliations
Xiaoping Lou, Beijing Information Science & Technology Univ. (China)
Naiguang Lv, Beijing Information Science & Technology Univ. (China)
Peng Sun, Beijing Information Science & Technology Univ. (China)
Fengxia Duan, Beijing Information Science & Technology Univ. (China)
Yimin Lin, Beijing Information Science & Technology Univ. (China)


Published in SPIE Proceedings Vol. 7997:
Fourth International Seminar on Modern Cutting and Measurement Engineering
Jiezhi Xin; Lianqing Zhu; Zhongyu Wang, Editor(s)

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