Comparison on performance of some representative and recent filtering methods in electronic speckle pattern interferometry

In this paper, we first review some representative and recent filtering methods for electronic speckle pattern interferometry (ESPI) fringe or wrapped phase patterns, mainly including the second-order oriented partial differential equations (PDEs) filtering methods (SOOPDE), the oriented, regularized quadratic cost function (ORQCF) method, the oriented spatial filter masks (OSFM), the windowed Fourier transform method (WFF), and the localized Fourier transform filter (LFF). Then we compare the performance of these representative and recent filtering methods via application to two computer-simulated ESPI fringe images, a computer-simulated ESPI wrapped phase pattern and one experimentally obtained ESPI wrapped phase pattern which are either high fringe density or variable fringe density. Lastly, we present the summary of the performance for these filtering methods. (C) 2012 Elsevier Ltd. All rights reserved.