20 September 2002 Unwrapping phase map by estimating regions containing phase jumps
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Abstract
We present herewith a phase unwrapping technique by estimation of regions containing 2π phase jumps based on their phase-distribution features. The more the neighbors around a pixel have phase values near π and -π, and the smaller the number difference between the neighbors near π and -π, the more possibly the pixel locates near a phase jump. The pixels with high possibility forms the phase-jump regions, which can then be eliminated by compensating the pixels with a multiply of 2π to minimize the phase difference between them and their neighbors. After removing phase jumps, one can utilize ordinary filtering operations to postprocess the noisy unwrapped phase map. Computer simulation and experimental results from the surface profile measurements of a transparent plate are presented.
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Feng Qian, Feng Qian, Xiangzhao Wang, Xiangzhao Wang, Zhenjun Peng, Zhenjun Peng, Xuefeng Wang, Xuefeng Wang, } "Unwrapping phase map by estimating regions containing phase jumps", Proc. SPIE 4927, Optical Design and Testing, (20 September 2002); doi: 10.1117/12.471440; https://doi.org/10.1117/12.471440
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