Absolute phase measurements using geometric constraints between multiple cameras and projectors
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
© 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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