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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 8 — Mar. 10, 2007
  • pp: 1233–1243

Neural network digital fringe calibration technique for structured light profilometers

Matthew J. Baker, Jiangtao Xi, and Joe F. Chicharo  »View Author Affiliations


Applied Optics, Vol. 46, Issue 8, pp. 1233-1243 (2007)
http://dx.doi.org/10.1364/AO.46.001233


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Abstract

We present a novel neural network signal calibration technique to improve the performance of triangulation-based structured light profilometers based on digital projection. The performance of such profilometers is often hindered by the capture of aberrated pattern intensity distributions, and hence we address this problem by employing neural networks in a signal mapping approach. We exploit the generalization and interpolation capabilities of a feed-forward backpropagation neural network to map from distorted fringe data to nondistorted data. The performance of the calibration technique is gauged both through simulation and experimentation, with simulation results indicating that accuracy can be improved by more than 80%. The technique requires just one image cross section for calibration and hence is ideal for rapid profiling applications.

© 2007 Optical Society of America

OCIS Codes
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(150.6910) Machine vision : Three-dimensional sensing

History
Original Manuscript: July 24, 2006
Manuscript Accepted: September 25, 2006
Published: February 20, 2007

Citation
Matthew J. Baker, Jiangtao Xi, and Joe F. Chicharo, "Neural network digital fringe calibration technique for structured light profilometers," Appl. Opt. 46, 1233-1243 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-8-1233


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