Phase-map unwrapping: a comparison of some traditional methods and a presentation of a new approach

Mette Owner-Petersen

doi:10.1117/12.47091

1 October 1991 Phase-map unwrapping: a comparison of some traditional methods and a presentation of a new approach

Mette Owner-Petersen

Author Affiliations +

Proceedings Volume 1508, Industrial Applications of Holographic and Speckle Measuring Techniques; (1991) https://doi.org/10.1117/12.47091
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

Abstract

This paper deals with the problems encountered when unwrapping a noisy phase map obtained in connection with phase shifting speckle interferometry. Due to decorrelation of the speckle patterns obtained before and after loading the object, these phase maps are very noisy and unwrapping requires smoothing. Traditional procedures based upon averaging or median filtering in a window have some disadvantages. Averaging tends to smooth the jumps to be identified in the phase map and median filtering is very slow. A new fast-edge preserving approach is presented and compared to some traditional methods by means of evaluating their performance when filtering and unwrapping a computer-generated noisy sawtooth pattern.

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Mette Owner-Petersen "Phase-map unwrapping: a comparison of some traditional methods and a presentation of a new approach", Proc. SPIE 1508, Industrial Applications of Holographic and Speckle Measuring Techniques, (1 October 1991); https://doi.org/10.1117/12.47091

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