11 September 2017 Optimized fringe patterns based on dual-frequency phase-shift technology in fringe projection profilometry
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Hao Yu, Hao Yu, Liangzhao Lin, Liangzhao Lin, Xiaoying Li, Xiaoying Li, Xiaoxu Lu, Xiaoxu Lu, Liyun Zhong, Liyun Zhong, Shengde Liu, 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 . Submission: Received: 13 June 2017; Accepted: 18 August 2017
Received: 13 June 2017; Accepted: 18 August 2017; Published: 11 September 2017
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