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Robust phase demodulation of interferograms with open or closed fringes
Authors:Rivera Mariano
Affiliation:Centro de Investigacion en Matematicas A.C., Apartado Postal 402, Guanajuato, Guanajuato, Mexico 36000. mrivera@cimat.mx
Abstract:We present two robust algorithms for fringe pattern analysis with partial-field and closed fringes. The algorithm for partial-field fringe patterns is presented as a refinement method for precomputed coarse phases. Such an algorithm consists of the minimization of a regularized cost function that incorporates an outlier rejection strategy, which causes the algorithm to become robust. On the basis of the phase refinement method, we propose a propagative scheme for phase retrieval from closed-fringe interferograms. The algorithm performance is demonstrated by demodulating closed-fringe interferograms with complex spatial distribution of stationary points and gradients in the illumination components.
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