Quiroga Mellado, Juan AntonioVargas Balbuena, JavierBelenguer Dávila, Tomás2023-06-202023-06-202010-11-011. M. Servín, J. L. Marroquin, and J. A. Quiroga, J. Opt. Soc. Am. A 21, 411 (2004). 2. M. Servín, J. A. Quiroga, and J. L. Marroquín, J. Opt. Soc. Am. A 20, 925 (2003). 3. J. Villa, I. De la Rosa, G. Miramontes, and J. A. Quiroga, J. Opt. Soc. Am. A 22, 2766 (2005). 4. M. Rivera, J. Opt. Soc. Am. A 22, 1170 (2005). 5. C. Ai and J. Wyant, Appl. Opt. 27, 3039 (1988). 6. X. Zhong, J. Opt. A 8, 617 (2006). 7. T. Svoboda J. Kybic, and V. Hlavac, Image Processing, Analysis and Machine Vision: a MATLAB Companion (Thomson, 2008). 8. A. Federico and G. H. Kaufmann, Appl. Opt. 45, 1909 (2006).0146-959210.1364/OL.35.003550https://hdl.handle.net/20.500.14352/43964© 2010 Optical Society of AmericaWe demonstrate a method to directly demodulate closed-fringe interferograms using a kind of active contour called a snake. This method can be used to demodulate a single closed-fringe interferogram when its background illumination and/or contrast terms have a spatial frequency similar to the spatial frequency of the equivalent normalized interferogram. Among other cases, this problematic usually appears in interferometry when spurious reflection appears in the interferogram. In these situations, typical Fourier-based methods are of no help. We show a set of simulations and experimental results that prove the effectiveness of the proposed method.engjournal articlehttp://dx.doi.org/10.1364/OL.35.003550http://www.opticsinfobase.orgopen access535Spurious ReflectionPhaseInterferometryQuadratureÓptica (Física)2209.19 Óptica Física