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

Motoharu Fujigaki; Yoshiharu Morimoto; Shien Ri

doi:10.1117/12.621663

12 April 2005 Improvement of accuracy of shape measurement using DMD reflection-type CCD camera

Motoharu Fujigaki, Yoshiharu Morimoto, Shien Ri

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621663
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

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.

Citation Download Citation

Motoharu Fujigaki, Yoshiharu Morimoto, and Shien Ri "Improvement of accuracy of shape measurement using DMD reflection-type CCD camera", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621663

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