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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 27, Iss. 9 — Sep. 1, 2010
  • pp: 1962–1971

Maximum SNR pattern strategy for phase shifting methods in structured light illumination

Yongchang Wang, Kai Liu, Daniel L. Lau, Qi Hao, and Laurence G. Hassebrook  »View Author Affiliations


JOSA A, Vol. 27, Issue 9, pp. 1962-1971 (2010)
http://dx.doi.org/10.1364/JOSAA.27.001962


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Abstract

Structured light illumination by means of phase shifting patterns is a widely employed method for three-dimensional (3-D) image acquisition that is robust to ambient light and object albedo but may be especially susceptible to sensor and environment noise. In this paper, we study the specific technique of phase measuring profilometry (PMP) and the maximization of a pattern’s signal to noise ratio (SNR). By treating the design of an N-pattern PMP process as placing points in an N-dimensional coding space, we define a pattern’s SNR in terms of a pattern set’s computational length and the number of coded phase periods in the projected patterns. Then, without introducing phase ambiguities, we propose a so-called edge pattern strategy that maximizes the computational length and number of periods. Theoretically, the edge pattern technique improves the SNR by 1.2381 times when using three component patterns and by 15.5421 times when using five patterns. Experimental results further demonstrate the improved SNR of the proposed edge pattern technique such that more accurate 3-D results are achieved using fewer component patterns.

© 2010 Optical Society of America

OCIS Codes
(110.6880) Imaging systems : Three-dimensional image acquisition
(150.5670) Machine vision : Range finding
(150.6910) Machine vision : Three-dimensional sensing
(110.2945) Imaging systems : Illumination design
(150.2945) Machine vision : Illumination design

ToC Category:
Machine Vision

History
Original Manuscript: February 24, 2010
Revised Manuscript: May 25, 2010
Manuscript Accepted: June 23, 2010
Published: August 12, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

Citation
Yongchang Wang, Kai Liu, Daniel L. Lau, Qi Hao, and Laurence G. Hassebrook, "Maximum SNR pattern strategy for phase shifting methods in structured light illumination," J. Opt. Soc. Am. A 27, 1962-1971 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-9-1962

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