Share Email Print
cover

Proceedings Paper

Shape measurement by unwrapping method using aliasing of Fourier spectrum
Author(s): Yoshiharu Morimoto; Motoharu Fujigaki; Toshio Toyotake
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

We previously proposed the integrated phase-shifting method for real-time shape measurement using grating projection method. However, the measurement range in this technique is not so wide, since phase-unwrapping has not been made. In this study, a grating synthesized two cosinusoidal waves of which the frequencies differ from each other, was used in order to perform unwrapping. If the frequencies are 3 and 4, in order to analyze frequencies and phases, the minimum sampling number of phase-shifted images is 8 according to the Whittaker-Shannon sampling theorem. We propose a new unwrapping method using only 5 phase-shifted images. The phase values are obtained from the aliased frequency components of the Fourier spectrum of the grating. The theory is shown and the effectiveness is confirmed by experiment.

Paper Details

Date Published: 12 April 2005
PDF: 5 pages
Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); doi: 10.1117/12.621457
Show Author Affiliations
Yoshiharu Morimoto, Wakayama Univ. (Japan)
Motoharu Fujigaki, Wakayama Univ. (Japan)
Toshio Toyotake, Wakayama Univ. (Japan)


Published in SPIE Proceedings Vol. 5852:
Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics
Chenggen Quan; Fook Siong Chau; Anand Asundi; Brian Stephen Wong; Chwee Teck Lim, Editor(s)

© SPIE. Terms of Use
Back to Top