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Fourier transform profilometry: a review
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DOI：10.1016/S0143-8166(01)00023-9.png)
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Fourier transform plofilometry is one of the popular non-contact 3-D 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. This method requires only one Frame (or two frames) of the deformed fringe pattern in some algorithms to retrieve the surface of measured object, so it has obvious advantage for real time data acquisition and 3-D measurement of dynamic process. In this paper, we review some algorithms ill FTP, discuss some important problems, including frequency spectra overlapping, phase unwrapping, sampling, and 3-D measurement of dynamic process. With the development of computer hardware and software and availability of high-resolution image grabber, FTP method will be a promising one for acquiring 3-D data of object, and more acid more researchers pay attention to it. (C) 2001 Elsevier Science Ltd. All rights reserved.
Keyword:
PHASE-MEASURING PROFILOMETRY
3-DIMENSIONAL OBJECT SHAPES
CELLULAR-AUTOMATA METHOD
FRINGE-PATTERN-ANALYSIS
3-D DIFFUSE OBJECTS
UNWRAPPING ALGORITHM
CARRIER FREQUENCY
MODULATION MEASUREMENT
GRATING PROJECTION
MAPPING ALGORITHM
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