Evaluation of ESPI phase images with regional discontinuities

Detlef Winter; Dirk Bergmann; Bernd W. Luehrig; Reinhold Ritter

doi:10.1117/12.165465

10 December 1993 Evaluation of ESPI phase images with regional discontinuities: area-based unwrapping

Detlef Winter, Dirk Bergmann, Bernd W. Luehrig, Reinhold Ritter

Proceedings Volume 2003, Interferometry VI: Techniques and Analysis; (1993) https://doi.org/10.1117/12.165465
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

A universal strategy for evaluation of ESPI (Electronic Speckle Pattern Interferometer)-phase images is proposed. Starting points of the strategy are the phase-shifted sets of the speckle- pattern of two object states. Special algorithms for calculating the modulo 2(pi) phase-image (so called `saw-tooth-image') and filtering to reduce the speckle noise and mask out areas of bad intensity modulation and of local discontinuities are described. A new area based algorithm works automatically. Regional discontinuities in the saw-tooth-images don't cause errors in the results of the true phase data. All of the proposed algorithms are implemented and tested in the hardware independent (UNIX, C, X-Windows, OSF-MOTIV) program system PISA.

Citation Download Citation

Detlef Winter, Dirk Bergmann, Bernd W. Luehrig, and Reinhold Ritter "Evaluation of ESPI phase images with regional discontinuities: area-based unwrapping", Proc. SPIE 2003, Interferometry VI: Techniques and Analysis, (10 December 1993); https://doi.org/10.1117/12.165465

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