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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 29 — Oct. 10, 2008
  • pp: 5527–5533

Improved speckle projection profilometry for out-of-plane shape measurement

Bing Pan, Huimin Xie, Jianxin Gao, and Anand Asundi  »View Author Affiliations


Applied Optics, Vol. 47, Issue 29, pp. 5527-5533 (2008)
http://dx.doi.org/10.1364/AO.47.005527


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Abstract

An improved speckle projection profilometry that combines the projection of computer generated random speckle patterns using an ordinary LCD projector and the two-dimensional digital image correlation technique for in-plane displacements measurement is proposed for accurate out-of-plane shape and displacement measurements. The improved technique employs a simple yet effective calibration technique to determine the linear relationship between the out-of-plane height and the measured in-plane displacements. In addition, the iterative spatial domain cross-correlation algorithm, i.e., the improved Newton–Raphson algorithm using the zero-normalized sum of squared differences correlation criterion and the second-order shape function was employed in image correlation analysis for in-plane displacement determination of the projected speckle patterns, which provides more reliable and accurate matching with a higher correlation coefficient. Experimental results of both a regular cylinder and a human hand demonstrate that the proposed technique is easy to implement and can be applied to a practical out-of-plane shape and displacement measurement with high accuracy.

© 2008 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 9, 2008
Revised Manuscript: September 14, 2008
Manuscript Accepted: September 15, 2008
Published: October 9, 2008

Virtual Issues
Vol. 3, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Bing Pan, Huimin Xie, Jianxin Gao, and Anand Asundi, "Improved speckle projection profilometry for out-of-plane shape measurement," Appl. Opt. 47, 5527-5533 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-29-5527

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