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Optical Engineering

Adaptive windowed Fourier transform in 3-D shape measurement
Author(s): Suzhen Zheng; Wenjing Chen; Xianyu Su
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Paper Abstract

An adaptive windowed Fourier transform method in 3-D measurement based on a wavelet transform is proposed, in which, by applying a wavelet ridge, a series of scaling factors are calculated to determine the series of prime windows needed in the windowed Fourier transform method. Because the spectrum of each local fringe is simpler than that of the whole fringe, even though there is frequency aliasing as far as the whole fringe is concerned, the fundamental spectrum may separate into components in each local fringe. It is easy to filter out one of the fundamental frequency components from the local spectra. Adding these local fundamental components, the full fundamental component can be obtained correctly. The advantage of the method is that it not only eliminates the frequency aliasing, but also obtains the modulation distribution function to guide phase unwrapping.

Paper Details

Date Published: 1 June 2006
PDF: 4 pages
Opt. Eng. 45(6) 063601 doi: 10.1117/1.2213986
Published in: Optical Engineering Volume 45, Issue 6
Show Author Affiliations
Suzhen Zheng, Sichuan Univ. (China)
Wenjing Chen, Sichuan Univ. (China)
Xianyu Su, Sichuan Univ. (China)

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