Abstract
A new technique for phase extraction from a single fringe-pattern image is presented. The algorithm locates the fringe maxima (assigned value 1) and minima (assigned value −1), and converts the intermediate gray-values into values between −1 and 1 using linear interpolation. A wrapped phase map is demodulated from a single fringe-pattern and the phase values are computed using an atan mode rather than an atan2 mode. Using the new algorithm wrapped phase values can be efficiently extracted from a single fringe pattern without the need for phase-shifting or carrier fringes. Phase extraction is carried out without the need for assigning fringe orders and distinction for a peak and a trough. The method can be applied to the study of transient events. Experimental results are presented to demonstrate the validity of the method.
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