Quiroga Mellado, Juan AntonioGonzález Cano, Agustín2023-06-202023-06-202000-06-100003-693510.1364/AO.39.002931https://hdl.handle.net/20.500.14352/58789© 2000 Optical Society of America. During realization of this study J. A. Quiroga was supported in part by a post-doctoral grant from the Universidad Complutense de Madrid and by the Becas Internacionales Flores-Valles program, Spain. We acknowledge the support of the Centro de Investigaciones en Óptica (CIO), León, México.We present the application of a regularization algorithm to the processing of photoelastic fringe patterns. The method used is a modified regularized phase-tracking (RPT) algorithm applied to phase-shifted images. In particular, we present an algorithm for isoclinic-isochromatic separation that uses only five images. In the case of isoclinics the method can deal with problems associated with modulation of isochromatics and with isotropic points by means of a modified cost functional. With respect to the isochromatics the problems associated with regions of high fringe density are solved in a robust way by the unmodified RPT algorithm by use of the modulation information. The performance of the method is discussed, and experimental results are presented.engjournal articlehttp://dx.doi.org/10.1364/AO.39.002931http://www.opticsinfobase.org/open access535Adaptive Quadrature FiltersFringe-Pattern ImagesÓptica (Física)2209.19 Óptica Física