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A modified phase-coding method for absolute phase retrieval
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DOI：10.1016/j.optlaseng.2016.03.018.png)
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Abstract
En 中文
Fringe projection technique is one of the most robust tools for three dimensional (3D) shape measurement. Various fringe projection methods have been proposed for addressing different issues in profilometry and phase-coding is one such technique employed to determine fringe orders for absolute phase retrieval. However this method is prone to fringe order error, while dealing with high-frequency fringes. This paper studies phase error introduced by system non-linearity in phase-coding and provides a mathematical model to obtain the maximum number of achievable codewords in a given scheme. In addition, a modified phase-coding method is also proposed for phase error compensation. Experimental study validates the theoretical analysis on the maximum number of achievable codewords and the performance of the modified phase-coding method is also illustrated. (C) 2016 Elsevier Ltd. All rights reserved.
Keywords:
Fringe projection
Phase-coding
Phase-shifting
System non-linearity
Phase error compensation
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