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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 16 — Jun. 1, 2012
  • pp: 3194–3204

Method to eliminate the zero spectra in Fourier transform profilometry based on a cost function

Shi-lin Cui, Fei Tian, and De-hua Li  »View Author Affiliations


Applied Optics, Vol. 51, Issue 16, pp. 3194-3204 (2012)
http://dx.doi.org/10.1364/AO.51.003194


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Abstract

To increase the accuracy, speed, and robustness of 3D measurements in Fourier transform profilometry (FTP), this paper introduces a cost function according to the intrinsic features of the amplitude and frequency modulated (AF/M) signal and proposes two new algorithms to eliminate the background components of the fringe pattern based on the proposed cost function. Finally, the standard Fourier transform (FT) is used to calculate the phase of the pattern, which no longer contains background components. The two proposed methods are both data-driven and require no parameter adjustments in advance. Theoretical analysis and 80 experimental results show that the proposed cost function is valid. The results of more than 80 experiments with different types of fringe patterns, different carrier frequencies, and different noise variances with frequency overlap and sudden phase variation show that the proposed two methods are more accurate and robust than the 2D Gabor wavelet transform, the 2D Fan wavelet transform, and the 1D complex Morlet wavelet transform profilometry, and they are approximately 70 times faster than the 1D complex Morlet wavelet transform profilometry.

© 2012 Optical Society of America

OCIS Codes
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(070.2025) Fourier optics and signal processing : Discrete optical signal processing
(070.2615) Fourier optics and signal processing : Frequency filtering

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: October 17, 2011
Revised Manuscript: January 10, 2012
Manuscript Accepted: January 18, 2012
Published: May 23, 2012

Citation
Shi-lin Cui, Fei Tian, and De-hua Li, "Method to eliminate the zero spectra in Fourier transform profilometry based on a cost function," Appl. Opt. 51, 3194-3204 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-16-3194


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