Two-step interferometry by a regularized optical flow algorithm
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2011
Authors
Sánchez Sorzano, Carlos Óscar
Estrada, Julio César
Carazo García, José María
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The Optical Society Of America
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Abstract
A two-step phase-shifting method, that can demodulate open-and closed-fringed patterns without local sign ambiguity is presented. The proposed method only requires a constant phase-shift between the two interferograms. This phase-shift does not need to be known and can take any value inside the range (0, 2 π), excluding the singular case where it corresponds to π. The proposed method is based on determining first the fringe direction map by a regularized optical flow algorithm. After that, we apply the spiral phase transform (SPT) to one of the fringe patterns and we determine its quadrature signal using the previously determined direction. The proposed technique has been applied to simulated and experimental interferograms obtaining satisfactory results. A complete MATLAB software package is provided in [http://goo.gl/Snnz7].
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© 2011 Optical Society of America.
We would like to acknowledge partial support from the
Spanish Ministry of Science and Innovation through
grants ACI2009-1022, ACI2010-108 and BIO2010-16566.