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A spatial algorithm to reduce phase wraps from two dimensional signals in fringe projection profilometry

Arevalillo-Herráez, M and Gdeisat, M and Lilley, F and Burton, DR (2016) A spatial algorithm to reduce phase wraps from two dimensional signals in fringe projection profilometry. Optics and Lasers in Engineering, 82. pp. 70-78. ISSN 0143-8166

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Abstract

© 2015 Elsevier Ltd. All rights reserved. In this paper, we present a novel algorithm to reduce the number of phase wraps in two dimensional signals in fringe projection profilometry. The technique operates in the spatial domain, and achieves a significant computational saving with regard to existing methods based on frequency shifting. The method works by estimating the modes of the first differences distribution in each axial direction. These are used to generate a tilted plane, which is subtracted from the entire phase map. Finally, the result is re-wrapped to obtain a phase map with fewer wraps. The method may be able to completely eliminate the phase wraps in many cases, or can achieve a significant phase wrap reduction that helps the subsequent unwrapping of the signal. The algorithm has been exhaustively tested across a large number of real and simulated signals, showing similar results compared to approaches operating in the frequency domain, but at significantly lower running times.

Item Type: Article
Uncontrolled Keywords: 0205 Optical Physics
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: General Engineering Research Institute
Publisher: Elsevier
Date Deposited: 15 Apr 2016 13:55
Last Modified: 24 Feb 2017 00:50
DOI or Identification number: 10.1016/j.optlaseng.2015.11.009
URI: http://researchonline.ljmu.ac.uk/id/eprint/3438

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