Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm

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2009-10-23
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Zhang, Song
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Mechanical Engineering
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We address a framework to reduce the unwrapping errors of the measurement system using a digital multiple-wavelength phase-shifting algorithm. In particular, the following framework is proposed: (1) smooth the raw phase by smoothing the sine and cosine images of the phase computation of the inverse tangent function; (2) locate and remove the incorrectly unwrapped points by the monotonicity condition of the phase map; (3) obtain the unwrapped phase map for the shortest wavelength without smoothing; (4) detect holes and fill them to preserve as much useful information as possible. Experiments demonstrated that the proposed framework significantly alleviated the measurement errors caused by the phase noise.

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This article is from Optical Engineering 48 (2009): 1, doi:10.1117/1.3251280. Posted with permission.

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Thu Jan 01 00:00:00 UTC 2009
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