A New Method for Speckle Fringe Pattern Normalization Based on Multichannel Filtering
基于多通道滤波技术的散斑条纹图正则化方法

Normalization is an important basis for phase extraction from fringe patterns in photomechanics. For a speckle fringe pattern, this task is difficult since fringe pattern is strongly spoiled by speckle noise. In this paper, an algorithm for speckle fringe pattern normalization is presented based on multichannel filtering. Speckle fringe pattern was first filtered by multichannel Gabor filters, then, the filtering results were weighted added up, which is depended on the fringe modulation. Finally, a normalized fringe pattern was obtained. Simulation and experimental results show that the speckle fringe pattern is well normalized as well as the speckle noise in the fringe pattern is removed efficiently. This method provides a good basis for further extracting phase from a fringe pattern.