Fringe patterns produced by various optical interferometric techniques encode
information such as shape, deformation, and refractive index. Denoising and
demodulation are two important procedures to retrieve information from a single
closed fringe pattern. Various existing denoising and demodulation techniques
require fringe direction/orientation during the processing. Fringe orientation
is often easier to obtain but fringe direction is needed in some demodulation
techniques. A quality-guided orientation unwrapping scheme is proposed to
estimate direction from orientation. Two techniques, one based on windowed
Fourier ridges and the other based on fringe gradient, are proposed for the
quality-guided orientation unwrapping scheme. The direction qualities are
compared for both simulated and experimental fringe patterns. Their application
to demodulation technique is also given.
© 2012 Optical Society of America
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