Publication: Modulo 2π fringe orientation angle estimation by phase unwrapping with a regularized phase tracking algorithm
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2002-08
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Optical Society of America
Abstract
The fringe orientation angle provides useful information for many fringe-pattern-processing techniques. From a single normalized fringe pattern (background suppressed and modulation normalized), the fringe orientation angle can be obtained by computing the irradiance gradient and performing a further aretangent computation. Because of the 180° ambiguity of the fringe direction, the orientation angle computed from the gradient of a single fringe pattern can be determined only modulo pi. Recently, several studies have shown that a reliable determination of the fringe orientation angle modulo 2π is a key point for a robust demodulation of the phase from a single fringe pattern. We present an algorithm for the computation of the modulo 2π fringe orientation angle by unwrapping the orientation angle obtained from the gradient computation with a regularized phase tracking method. Simulated as well as experimental results are presented.
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© 2002 Optical Society of America.
We are grateful for the financial support of this work given by the European Union under project INDUCE, Contract BRPR-CT97-0805, and by the National Council for Science and Technology (CONACYT), Mexico, under project PROSUVE, contract PR48/01-9858.
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