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Proceedings Paper

Unwrapping weighted algorithm in fringe projection 3D profilometry
Author(s): Giuseppe Schirripa Spagnolo; Raffaele Majo; Dario Ambrosini; Domenica Paoletti
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Paper Abstract

In this paper we present an unwrapping weighted algorithm to analyze phase maps obtained by fringe projection 3-D profilometry. Phase unwrapping is a critical step in any phase measurement technique in which the height of an object is obtained from phase data. Indeed, when a complex object is measured, abrupt and irregular changes in the measured surface may result in local shadows. In shadow areas the observed phase data are uncertain or misleading. These zones yield “lacunae”, in the reconstruction of the 3D model. In this work we propose a new phase unwrapping method able to mitigate the “lacunae” problem by interpolation of phase data. The case of an image containing regions without phase information is treated, in our algorithm in the following manner: (a) phase inconsistencies are handled by excluding invalid pixels from the unwrapping process though the assignment of zero-valued weights; (b) an unwrapped phase map is obtained by an algorithm based on robust, path-independent method of phase unwrapping; (c) the lacks (zones of phase inconsistencies) are eliminated by means of an suitable procedure of interpolation; (d) a rewrapping procedure is used to obtain wrapped phase map without initial inconsistencies; (e) a new unwrapped phase map is obtained by the same algorithm used in step-b but with weights different from zero. The robustness of the proposed phase-unwrapping method is then tested computationally and experimentally and its enhancement is proven through the simulation and experimental results.

Paper Details

Date Published: 23 October 2003
PDF: 8 pages
Proc. SPIE 5202, Optical Information Systems, (23 October 2003); doi: 10.1117/12.505285
Show Author Affiliations
Giuseppe Schirripa Spagnolo, INFM, Univ. degli Studi di Roma Tre (Italy)
Raffaele Majo, INFM, Univ. degli Studi di Roma Tre (Italy)
Dario Ambrosini, INFM, Univ. degli Studi di L'Aquila (Italy)
Domenica Paoletti, INFM, Univ. degli Studi di L'Aquila (Italy)

Published in SPIE Proceedings Vol. 5202:
Optical Information Systems
Bahram Javidi; Demetri Psaltis, Editor(s)

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