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Optical Engineering

Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm
Author(s): Song Zhang
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Paper Abstract

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.

Paper Details

Date Published: 1 October 2009
PDF: 8 pages
Opt. Eng. 48(10) 105601 doi: 10.1117/1.3251280
Published in: Optical Engineering Volume 48, Issue 10
Show Author Affiliations
Song Zhang, Iowa State Univ. (United States)

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