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1 October 2009 Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm
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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.
©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)
Song Zhang "Phase unwrapping error reduction framework for a multiple-wavelength phase-shifting algorithm," Optical Engineering 48(10), 105601 (1 October 2009). https://doi.org/10.1117/1.3251280
Published: 1 October 2009
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