The quality enhancement of a single fringe pattern is a challenging task in speckle interferometry. Fringe patterns suffer greatly from three adverse variations (nonuniform background, speckle noise, and intensity modulation). In this Letter, we propose a three-layer filtering strategy for noisy fringe patterns. The first layer is aimed at high-frequency speckle noises and low-frequency background. The second layer is for remaining speckle noises distributed in the middle-frequency band. The third layer will further implement quality enhancement by a phase-recovery technique. The proposed strategy is quantitatively evaluated by different indexes and verified to be effective through numerous comparative experiments.
© 2013 Optical Society of America
Original Manuscript: July 30, 2013
Revised Manuscript: September 4, 2013
Manuscript Accepted: September 6, 2013
Published: October 9, 2013
Yi Zhou and Hongguang Li, "Enhancement strategy based on three-layer filtering for a single fringe pattern," Opt. Lett. 38, 4124-4127 (2013)