Journal ArticleDOI
Adaptive windowed Fourier transform in 3-D shape measurement
TLDR
An adaptive windowed Fourier transform method in 3-D measurement based on a wavelet transform is proposed, in which, by applying aWavelet ridge, a series of scaling factors are calculated to determine the series of prime windows needed in the windowed Fresnel transform method.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.read more
Citations
More filters
Journal ArticleDOI
Fringe projection techniques: Whither we are?
Sai Siva Gorthi,Pramod Rastogi +1 more
TL;DR: This paper presents a meta-analyses of Fourier-Transform Profilometry and its applications in 3-D Shape Measurement and Surface Profile Measurement for Structured Light Pattern and 4-Core Optical-Fiber.
Journal ArticleDOI
Fringe analysis: Premise and perspectives
TL;DR: Keywords: fringe analysis Reference EPFL-ARTICLE-176959doi:10.1016/j.optlaseng.2012.04.006View record in Web of Science URL: http://www.sciencedirect.com/science/article/pii/S0143816612001182
Journal ArticleDOI
Phase-retrieval techniques in fringe-projection profilometry
Chenggen Quan,Wen Chen,C.J. Tay +2 more
TL;DR: FTP, phase-shifting and continuous wavelet transform (CWT) are briefly described and discussed and two-dimensional short-time Fourier transform (STFT) is also presented to extract wrapped phase maps.
Journal ArticleDOI
An improved windowed Fourier transform for fringe demodulation
Chenggen Quan,H. Niu,Cho Jui Tay +2 more
TL;DR: The proposed algorithm is based on the introduction of a fast Fourier transform in WFT to reduce computation time for fringe demodulation and the Gerchberg method is employed to extrapolate the fringe pattern at the boundaries to reduce boundary effects.
Journal ArticleDOI
Applicability analysis of wavelet-transform profilometry
Zibang Zhang,Jingang Zhong +1 more
TL;DR: This work proposes to increase the carrier fringe frequency to improve the applicability of the wavelet-transform profilometry and the measurement accuracy and presents a more robust applicability condition which is based on the evaluation of the local linearity.
References
More filters
Journal ArticleDOI
Fourier transform profilometry for the automatic measurement of 3-D object shapes
Mitsuo Takeda,Kazuhiro Mutoh +1 more
TL;DR: A new computer-based technique for automatic 3-D shape measurement is proposed and verified by experiments that has a much higher sensitivity than the conventional moire technique and is capable of fully automatic distinction between a depression and an elevation on the object surface.
Journal ArticleDOI
Fourier transform profilometry:: a review
Xianyu Su,Wenjing Chen +1 more
TL;DR: Fourier transform profilometry is one of the popular non-contact 3D measurement methods, where a Ronchi grating or sinusoidal grating is projected onto a diffuse three-dimensional surface, and the resulting deformed grating image is detected by a CCD camera and processed by a computer as discussed by the authors.
Journal ArticleDOI
Windowed Fourier transform for fringe pattern analysis
TL;DR: Two approaches are developed on the extraction of phase and phase derivatives from either phase-shifted fringe patterns or a single carrier fringe pattern based on the best match between the fringe pattern and computer-generated windowed exponential elements.
Journal ArticleDOI
Reliability-guided phase unwrapping algorithm: a review ☆
Xianyu Su,Wenjing Chen +1 more
TL;DR: A phase unwrapping algorithm based on the reliability-guided parameter map is reviewed, which shows that in the worse case the error is limited, if there is any, to local minimum areas.
Journal ArticleDOI
Phase-stepping grating profilometry: utilization of intensity modulation analysis in complex objects evaluation
TL;DR: In this paper, a new method for phase-stepping grating profilometry of complex objects is proposed and verified by experiments, where both the discrete phase distribution and the modulation depth distribution are calculated.
Related Papers (5)
Fourier transform profilometry for the automatic measurement of 3-D object shapes
Mitsuo Takeda,Kazuhiro Mutoh +1 more