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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 7 — Jul. 16, 2007

Absolute phase measurements using geometric constraints between multiple cameras and projectors

Rui Ishiyama, Shizuo Sakamoto, Johji Tajima, Takayuki Okatani, and Koichiro Deguchi  »View Author Affiliations


Applied Optics, Vol. 46, Issue 17, pp. 3528-3538 (2007)
http://dx.doi.org/10.1364/AO.46.003528


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Abstract

The method of phase shift with the projection of multiple cyclic patterns enables 3D measurement that is highly accurate, dense, and fast. However, this measurement is only possible for the wrapped phase value, which has ambiguities in its multiples of cycles. Two particular problems are that conventional methods require additional patterns to be projected to determine the absolute phase and that unwrapping the phase tends to fail where depth varies abruptly. Two methods are proposed: the first is to determine the absolute phase without additional patterns being projected by observing the projected pattern with multiple cameras and applying the geometric constraints between them, and the second is to prevent failure in unwrapping the phase by referring to continuities in the relative phases of multiple projected patterns. The proposed methods were achieved with a 3D scanner that can measure approximately a 180° field of view within 0.5 s, with an accuracy of 0.14   mm in depth.

© 2007 Optical Society of America

OCIS Codes
(100.2650) Image processing : Fringe analysis
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(150.6910) Machine vision : Three-dimensional sensing
(330.1400) Vision, color, and visual optics : Vision - binocular and stereopsis

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 25, 2006
Revised Manuscript: December 28, 2006
Manuscript Accepted: January 2, 2007
Published: May 18, 2007

Virtual Issues
Vol. 2, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Rui Ishiyama, Shizuo Sakamoto, Johji Tajima, Takayuki Okatani, and Koichiro Deguchi, "Absolute phase measurements using geometric constraints between multiple cameras and projectors," Appl. Opt. 46, 3528-3538 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-46-17-3528

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