Comparison of phase unwrapping algorithms applied to singular phase fields

K. Seifert1, A. Berger1, K. Mantel2, V. Nercissian1, N. Lindlein1
1 Institute of Optics, Information and Photonics, Friedrich-Alexander-University Erlangen-Nuremberg; 2 Max-Planck-Institute for the Science of Light, Erlangen
Kristina.J.Seifert@physik.stud.uni-erlangen.de
 
Deformation measurements of objects with rough surfaces can be carried out using speckle interferometry. To reconstruct the surface deformation, unwrapping of the measured phase data is necessary. Due to the surface roughness, the phase data contain a high amount of singularities, making the phase unwrapping highly involved.
To improve the evaluation of the phase data, physical means can be taken to reduce the number of singularities in the Speckle field. Nonetheless, it is inevitable to apply elaborated software algorithms for the phase unwrapping.
In this work, we test several well known phase unwrapping algorithms and apply them to phase data with a varying amount of singularities. Furthermore, we judge the effectiveness of above-mentioned physical means for reducing the number of singularities. Among the algorithms we compare are path following algorithms like Goldstein's and Flynn's algorithms, as well as global approaches like the minimum LP-Norm algorithm.
Keywords:
Speckle, Interferometrie, Optische Informationsverarbeitung
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113. Tagung, Poster: P20