Weighted phase unwrapping utilizing intensity modulation analysis for phase-shifting profilometry

Zhenyu Jiang; Kemao Qian; Hong Miao; Xiaoping Wu

doi:10.1117/12.468757

29 May 2002 Weighted phase unwrapping utilizing intensity modulation analysis for phase-shifting profilometry

Zhenyu Jiang, Kemao Qian, Hong Miao, Xiaoping Wu

Proceedings Volume 4537, Third International Conference on Experimental Mechanics; (2002) https://doi.org/10.1117/12.468757
Event: Third International Conference on Experimental Mechanics, 2002, Beijing, China

Abstract

Path independent algorithm is frequently used for 2D phase unwrapping. The weighted phase unwrapping technique recently published by Ghiglia and Romero, which is based on least-squares method, obtained by the fast cosine transform, is a robust and fast path independent solution. We have improved weighted phase unwrapping by utilizing intensity modulation analysis to determine the weights for phase-shifting profilometry. An experimental result of object shape measurement is given to prove the validity of this technique, and make a contrast between the binary weight and decimal weight constructed by modulation analysis.

Citation Download Citation

Zhenyu Jiang, Kemao Qian, Hong Miao, and Xiaoping Wu "Weighted phase unwrapping utilizing intensity modulation analysis for phase-shifting profilometry", Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); https://doi.org/10.1117/12.468757

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KEYWORDS

Phase shift keying

Modulation

Phase shifts

Binary data

Fringe analysis

Phase measurement

Bandpass filters

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