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Proceedings Paper

Improvement of accuracy of shape measurement using DMD reflection-type CCD camera
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Paper Abstract

We previously developed a DMD(Digital Micro-mirror Device) reflection-type CCD camera that we call 'DMD camera' and we applied the DMD camera to shape measurement. In this former method, the integral values at a point are obtained by the averaging with the surrounding 9 pixels. This method, therefore, causes a problem that errors are caused by misalignment between the CCD pixel and the DMD pixel. In this paper, we propose a method to improve the algorithm to obtain the phase of a projected grating by phase-shifting method using correlation. The transferred on/off pattern to the DMD are modified and the integral values at a point are obtained by the averaging with the vertical 4 pixels. The accuracy of the shape measurement is improved using the proposed method. The principle, an experimental result, and a comparison of the accuracy between the former method and the proposed method are shown.

Paper Details

Date Published: 12 April 2005
PDF: 7 pages
Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); doi: 10.1117/12.621663
Show Author Affiliations
Motoharu Fujigaki, Wakayama Univ. (Japan)
Yoshiharu Morimoto, Wakayama Univ. (Japan)
Shien Ri, 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)

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