A modified form of a phase tracking method to demodulate a single fringe pattern is
presented. Phase values from local areas of the interferogram are recovered by means of a
spatial synchronous technique instead of solving the set of nonlinear equations obtained
from the implementation of the ordinary algorithm. This results in a significant speed
improvement of the method. Additionally, the robustness against noise is maintained, and
the sensitivity to contrast variations is decremented with respect to the phase tracking technique.
© 2007 Optical Society of America
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