Ronald Driggers, Editor-in-Chief
Qian Kemao, Le Tran Hoai Nam, Lin Feng, and Seah Hock Soon
Qian Kemao,1,* Le Tran Hoai Nam,1 Lin Feng,1 and Seah Hock Soon1
1School of Computer Engineering, Nanyang Technological University, Singapore 639798
*Corresponding author: firstname.lastname@example.org
Some effective filtering methods for wrapped phase maps, a regularized phase-tracking method (RPT) without the regularization term, a multiple-parameter least-square method (MPLS), a windowed Fourier ridges method (WFR), an autocorrelation function method (ACF), and a sine∕cosine average filter (SCAF), are analyzed in order to establish their transversal relationship. The analysis shows that principles of the RPT,
MPLS, WFR, and ACF are equivalent and the SCAF also leads to the WFR by some extension, which elegantly unifies all these methods for filtering unwrapped phase maps.
© 2007 Optical Society of America
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Filtering by the SCAF,
(a) simulated noisy wrapped phase map,
(b) phase filtered by the SCAF with
and 10 repetitions,
(c) phase compensated by a horizontal local frequency of
and then filtered,
(d) phase filtered by the WFR.
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Table 1 Parameter Settings for Numerical Comparison of Different Filters
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