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Proceedings Paper

Grey-level coding for structured-light illumination systems
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Paper Abstract

Fringe Projection Profilometry and Phase Measuring Deflectometry Systems are well-established technologies for noncontact 3D surface measurements. A common challenge in those systems is to obtain the absolute surface information using few measurement frames. In practice both techniques often generate a series of sinusoidal fringe patterns with different frequencies and use a camera vision system to capture the (by the object) deformed patterns. The images containing the deformed patterns are then processed to obtain the 3D surface information. Sinusoidal multi-frequency techniques have been for years and are an on-going area of research, where various algorithms have been developed to measure the unwrapped phase map (at the shortest fringe period). Commonly, temporal phase shifting techniques are used to extract the phase at different frequencies. However, obtaining the phase map for every fringe period requires multiple measurement frames. In this work, the advantages of efficient grey level (GL) coding techniques are presented, where a focus is given on the reduction of frames for noncontact 3D surface measurements. A further focus is given on additional features of GL coding as e.g. the error-detecting and the error-correcting properties of those codes that make GL coding an interesting candidate for harsher measurement environments.

Paper Details

Date Published: 18 August 2018
PDF: 13 pages
Proc. SPIE 10749, Interferometry XIX, 107490F (18 August 2018); doi: 10.1117/12.2322050
Show Author Affiliations
Konstantinos Falaggis, The Univ. of North Carolina at Charlotte (United States)
Rosario Porras-Aguilar, The Univ. of North Carolina at Charlotte (United States)

Published in SPIE Proceedings Vol. 10749:
Interferometry XIX
Katherine Creath; Jan Burke; Michael B. North Morris; Angela D. Davies, Editor(s)

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