Quiroga Mellado, Juan AntonioGuerrero, J. A.Marroquín Zaleta, José LuisRivera Meraz, M.2023-06-202023-06-202005-11-150146-959210.1364/OL.30.003018https://hdl.handle.net/20.500.14352/50803© 2005 Optical Society of America. J. L. Marroquín (jlm@fractal.cimat.mx) and M. Rivera were supported in part by grants 46270 and 40722 from the Consejo Nacional de Ciencia y Tecnología, México; J. A. Quiroga was supported by grant DPI2002-02104 from the Ministerio Español de Ciencia y Tecnología.A technique is presented for filtering and normalizing noisy fringe patterns, which may include closed fringes, so that single-frame demodulation schemes may be successfully applied. It is based on the construction of an adaptive filter as a linear combination of the responses of a set of isotropic bandpass filters. The space-varying coefficients are proportional to the envelope of the response of each filter, which in turn is computed by using the corresponding monogenic image [Felsberg and Sommer, IEEE Trans. Signal Process. 49, 3136 (2001)]. Some examples of demodulation of real Electronic Speckle Pattern Interferometry (ESPI) images patterns are presented.engjournal articlehttp://dx.doi.org/10.1364/OL.30.003018http://www.opticsinfobase.orgopen access535DemodulationQuadratureÓptica (Física)2209.19 Óptica Física