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Proceedings Paper

Filtering-based phase unwrapping
Author(s): Kemao Qian; Wenjing Gao; Haixia Wang
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Paper 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.

Paper Details

Date Published: 11 August 2008
PDF: 6 pages
Proc. SPIE 7063, Interferometry XIV: Techniques and Analysis, 70630E (11 August 2008); doi: 10.1117/12.797390
Show Author Affiliations
Kemao Qian, Nanyang Technological Univ. (Singapore)
Wenjing Gao, Nanyang Technological Univ. (Singapore)
Haixia Wang, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 7063:
Interferometry XIV: Techniques and Analysis
Joanna Schmit; Katherine Creath; Catherine E. Towers, Editor(s)

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