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Optimized fringe patterns based on dual-frequency phase-shift technology in fringe projection profilometry
Author(s): Hao Yu; Liangzhao Lin; Xiaoying Li; Xiaoxu Lu; Liyun Zhong; Shengde Liu
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Paper Abstract

A look-up table (LUT) method for solving the problem of phase unwrapping is presented. Considering the effect of noise on the unwrapping process, a concept called “tolerance” is advanced, and an associated algorithm called the “equipartition of tolerance” algorithm is proposed. The proposed algorithm eliminates the need for a high signal-to-noise ratio while retaining the LUT method’s advantages of extended measurement range and high precision. Further, it improves the tolerance of the LUT method and enables reconstruction of discontinuous objects. In simulations and experiments conducted, the proposed algorithm successfully unwrapped the absolute phase of a slope model and a three-step model. The proposed algorithm is significantly more accurate and has better stability and sensitivity than the heterodyne algorithm.

Paper Details

Date Published: 11 September 2017
PDF: 11 pages
Opt. Eng. 56(9) 094104 doi: 10.1117/1.OE.56.9.094104
Published in: Optical Engineering Volume 56, Issue 9
Show Author Affiliations
Hao Yu, South China Normal Univ. (China)
Liangzhao Lin, South China Normal Univ. (China)
Xiaoying Li, South China Normal Univ. (China)
Xiaoxu Lu, South China Normal Univ. (China)
Liyun Zhong, South China Normal Univ. (China)
Shengde Liu, South China Normal Univ. (China)

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