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Proceedings Paper

Real-time composite pattern demodulation using optical correlators
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Paper Abstract

Structured light illumination refers to a technique of acquiring 3-D surface scans through triangulation between a camera and a projector. Because traditional structured-light systems use multiple patterns projected sequentially in time, SLI is not typically associated with applications involving moving surfaces. To address this problem, the authors have introduced a technique referred to as composite pattern projection which involves the combining of a set of standard SLI patterns into a continuously projected pattern such that depth can be recovered from a single, captured image. As such, composite patterns can be used for tracking moving objects in 3-D space. The problem with composite patterns, though, is the added computational complexity associated with demodulating the captured image and extract the component SLI patterns. So in this paper, we introduce a means of achieving real-time pattern demodulation through the use of optical correlators with demonstrated results achieving a processing rate of over 100 frames per second.

Paper Details

Date Published: 19 May 2006
PDF: 11 pages
Proc. SPIE 6220, Spaceborne Sensors III, 62200F (19 May 2006); doi: 10.1117/12.665902
Show Author Affiliations
Daniel L. Lau, Univ. of Kentucky (United States)
Laurence G. Hassebrook, Univ. of Kentucky (United States)
Thomas Lu, NASA Jet Propulsion Lab. (United States)
Tien-Hsin Chao, NASA Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 6220:
Spaceborne Sensors III
Richard T. Howard; Robert D. Richards, Editor(s)

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