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Modulo 2π fringe orientation angle estimation by phase unwrapping with a regularized phase tracking algorithm

2002; Optica Publishing Group; Volume: 19; Issue: 8 Linguagem: Inglês

10.1364/josaa.19.001524

1520-8532

Juan Antonio Quiroga, Manuel Servı́n, F. J. Cuevas,

Advanced Measurement and Metrology Techniques

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 arctangent computation. Because of the 180 degrees 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 2pi 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 2pi 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.