Adaptive filter for unwrapping noisy phase image in phase-stepping interferometry (original) (raw)

An adaptive ÿlter for preprocessing wrapped phase image with high noise content has been developed. The window size of this median ÿlter is adjustable according to its location in the noisy phase image. This size-adjustable median ÿlter has not only high noise-rejection ability, but also both good phase-jump identiÿcation and image-detail preservation properties. Phase unwrapping can then be done to recover the real phase image without the hampering in uence of noise, especially the noise near the phase jumps. Both numerical simulation and experimental results used to examine the e ectiveness of this adaptive ÿlter are presented.