Abstract
Electronic speckle pattern interferometry (ESPI) is a nondestructive, whole-field optical
measurement technique. The removal of speckle noise is fundamental to extract measurement information
accurately. In this letter, two filtering methods based on the oriented feature of ESPI fringes, i.e., the
second-order oriented partial differential equation (SOOPDE) and oriented, regularized quadratic-cost function
filtering methods, are first proven to be consistent. An important question in solving partial differential
equation, i.e., how to select suitable parameters in an adaptive manner, is then discussed. The
computer-simulated and experimentally obtained ESPI fringe patterns and phase map are processed by the SOOPDE
filtering model with adaptive selective parameters. The qualitative and quantitative analyses demonstrate that
the parameters selected by the adaptive method are effective and suitable for the SOOPDE filtering model.
© 2013 Chinese Optics Letters
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