Filtering-based phase unwrapping

Kemao Qian; Wenjing Gao; Haixia Wang

doi:10.1117/12.797390

11 August 2008 Filtering-based phase unwrapping

Kemao Qian, Wenjing Gao, Haixia Wang

Proceedings Volume 7063, Interferometry XIV: Techniques and Analysis; 70630E (2008) https://doi.org/10.1117/12.797390
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

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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KEYWORDS

Optical filters

Electronic filtering

Fourier transforms

Interference (communication)

Detection and tracking algorithms

Digital filtering

Optical interferometry

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