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11 August 2008 Filtering-based phase unwrapping
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Abstract
Phase unwrapping is a usually necessary step in optical interferometry in order to construct a continuous phase distribution. A straightforward strategy is to filter the noise effectively, followed by a simple phase unwrapping process. A windowed Fourier filter is proposed to realize this strategy, which has the following properties: (i) it removes the noise effectively; (ii) it preserves the phase near edges; (iii) it identifies invalid areas; (iv) the amplitude of filtered exponential phase field can be used as a quality map for quality-guided phase unwrapping; (v) the filtering result is insensitive to the threshold; (vi) the window size in the filter can be switched according to different requirement. A large window size is useful for noise filtering while a small window size is useful for protecting signal details.
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Kemao Qian, Wenjing Gao, and Haixia Wang "Filtering-based phase unwrapping", Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630E (11 August 2008); https://doi.org/10.1117/12.797390
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