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Optics Letters

Optics Letters


  • Vol. 36, Iss. 17 — Sep. 1, 2011
  • pp: 3485–3487

Two-step interferometry by a regularized optical flow algorithm

J. Vargas, J. Antonio Quiroga, C. O. S. Sorzano, J. C. Estrada, and J. M. Carazo  »View Author Affiliations

Optics Letters, Vol. 36, Issue 17, pp. 3485-3487 (2011)

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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 ].

© 2011 Optical Society of America

OCIS Codes
(100.2650) Image processing : Fringe analysis
(100.5070) Image processing : Phase retrieval

ToC Category:
Image Processing

Original Manuscript: July 5, 2011
Manuscript Accepted: August 3, 2011
Published: September 1, 2011

J. Vargas, J. Antonio Quiroga, C. O. S. Sorzano, J. C. Estrada, and J. M. Carazo, "Two-step interferometry by a regularized optical flow algorithm," Opt. Lett. 36, 3485-3487 (2011)

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