Optimized fringe patterns based on dual-frequency phase-shift technology in fringe projection profilometry

Hao Yu; Liangzhao Lin; Xiaoying Li; Xiaoxu Lu; Liyun Zhong; Shengde Liu

doi:10.1117/1.OE.56.9.094104

11 September 2017 Optimized fringe patterns based on dual-frequency phase-shift technology in fringe projection profilometry

Hao Yu, Liangzhao Lin, Xiaoying Li, Xiaoxu Lu, Liyun Zhong, Shengde Liu

Author Affiliations +

Optical Engineering, Vol. 56, Issue 9, 094104 (September 2017). https://doi.org/10.1117/1.OE.56.9.094104

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.

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Hao Yu, Liangzhao Lin, Xiaoying Li, Xiaoxu Lu, Liyun Zhong, and Shengde Liu "Optimized fringe patterns based on dual-frequency phase-shift technology in fringe projection profilometry," Optical Engineering 56(9), 094104 (11 September 2017). https://doi.org/10.1117/1.OE.56.9.094104

Received: 13 June 2017; Accepted: 18 August 2017; Published: 11 September 2017

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