title: Robust procedure for fringe analysis.
abstract: A robust procedure for analyzing fringe patterns obtained from speckle interferometric techniques is proposed. The fringes generally are observed only in a region S of a rectangular lattice L. We give a method for computing (from S) the region R, where the unwrapped phase is to be computed; this computation is done by use of a morphological filter (in particular, a closing filter). We then use a fast-unwrapping algorithm to compute the phase: a preconditioned conjugate-gradient algorithm that uses the discrete Fourier transform.
authors.forename: M
authors.initials: M
authors.lastname: Rivera
authors.forename: R
authors.initials: R
authors.lastname: Rodriguez-Vera
authors.forename: J L
authors.initials: JL
authors.lastname: Marroquin