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Optical Engineering

Improved composite-pattern structured-light profilometry by means of postprocessing
Author(s): Chun Guan; Laurence G. Hassebrook; Daniel L. Lau; V. G. Yalla; Charles J. Casey
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Paper Abstract

Structured-light illumination (SLI) means projecting a series of structured or striped patterns from a projector onto an object and then using a camera, placed at an angle from the projector, to record the target's 3-D shape. For multiplexing these structured patterns in time, traditional SLI systems require the target object to remain still during the scanning process. Thus, the technique of composite-pattern design was introduced as a means of combining multiple SLI patterns, using principles of frequency modulation, into a single pattern that can be continuously projected and from which 3-D surface can be reconstructed from a single image, thereby enabling the recording of 3-D video. But the associated process of modulation and demodulation is limited by the spatial bandwidth of the projector-camera pair, which introduces distortion near surface or albedo discontinuities. Therefore, this paper introduces a postprocessing step to refine the reconstructed depth surface. Simulated experiments show an 78% reduction in depth error.

Paper Details

Date Published: 1 September 2008
PDF: 11 pages
Opt. Eng. 47(9) 097203 doi: 10.1117/1.2981559
Published in: Optical Engineering Volume 47, Issue 9
Show Author Affiliations
Chun Guan, Univ. of Kentucky (United States)
Laurence G. Hassebrook, Univ. of Kentucky (United States)
Daniel L. Lau, Univ. of Kentucky (United States)
V. G. Yalla, Univ. of Kentucky (United States)
Charles J. Casey, Univ. of Kentucky (United States)

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