Abstract:

In this paper, an adaptive filtering algorithm for fringe patterns is presented. The algorithm automatically identifies different frequency regions of a fringe pattern, and adaptively switches between two different filtering methods for low-frequency and high-frequency regions in the pattern. The method is effective in noise reduction for various fringe patterns. It is particularly suited to fringe patterns containing large changes in spatial frequency. Computer simulation and experiment are carried out to demonstrate validity of this method.

Key words: fringe pattern; adaptive; filtering; noise reduction; spatial frequency