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Proceedings Paper

Features of the subjective speckle field and their use for noise-immune unwrapping
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Paper Abstract

It is known, that phase dislocations in objective speckle fields can be found at regions where the intensity of the wave-field disappears. In interferograms, created by object I've speckle fields, those dislocations usually form dipoles. They arise when the position of the dislocations changes between two object state. In this paper it is shown, that phase dislocations in interferograms from subjective speckle fields also form dipoles. They produce a noise- amplitude on the corresponding phase-map, which makes unwrapping more difficult. The mean width and the number of theses dipoles are investigated in dependence of the correlation and the density of the corresponding subjective speckle field. All these results have been obtained experimentally and have been additionally proofed by means of simulations. Because dipoles on the phase map appear at regions, where the corresponding intensity disappears, a modified line-scan-algorithm is proposed which only takes the bright areas into consideration.

Paper Details

Date Published: 23 October 2001
PDF: 9 pages
Proc. SPIE 4398, Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design, (23 October 2001); doi: 10.1117/12.445558
Show Author Affiliations
Claas Falldorf, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Wolfgang Osten, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Frank Elandaloussi, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Ervin Kolenovic, Bremer Institut fuer Angewandte Strahltechnik (Germany)
Werner P. O. Jueptner, Bremer Institut fuer Angewandte Strahltechnik (Germany)


Published in SPIE Proceedings Vol. 4398:
Optical Measurement Systems for Industrial Inspection II: Application in Industrial Design

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