Fringe patterns produced by various optical interferometric techniques encode information such as shape, deformation, and refractive index. Noise affects further processing of the fringe patterns. Denoising is often needed before fringe pattern demodulation. Filtering along the fringe orientation is an effective option. Such filters include coherence enhancing diffusion, spin filtering with curve windows, second-order oriented partial-differential equations, and the regularized quadratic cost function for oriented fringe pattern filtering. These filters are analyzed to establish the relationships among them. Theoretical analysis shows that the four filters are largely equivalent to each other. Quantitative results are given on simulated fringe patterns to validate the theoretical analysis and to compare the performance of these filters.
© 2011 Optical Society of America
Original Manuscript: September 30, 2010
Revised Manuscript: January 14, 2011
Manuscript Accepted: February 15, 2011
Published: April 13, 2011
Haixia Wang and Qian Kemao, "Comparative analysis on some spatial-domain filters for fringe pattern denoising," Appl. Opt. 50, 1687-1696 (2011)