Phase-unwrapping method in real-time shape measurement using composite rectangular grid

K. Iwai; Yoshiharu Morimoto; Motoharu Fujigaki; Satoru Yoneyama

doi:10.1117/12.468844

29 May 2002 Phase-unwrapping method in real-time shape measurement using composite rectangular grid

K. Iwai, Yoshiharu Morimoto, Motoharu Fujigaki, Satoru Yoneyama

Proceedings Volume 4537, Third International Conference on Experimental Mechanics; (2002) https://doi.org/10.1117/12.468844
Event: Third International Conference on Experimental Mechanics, 2002, Beijing, China

Abstract

It is possible to measure the 3D shape of an object using grid projection methods. Moire topography which is a kind of grid projection methods can obtain the contour lines of the measured object in real-time. The authors developed a real-time shape measurement system based on the Moire topography. In order to perform quantitative and real-time shape measurement, we developed the integrated phase shifting method. However, the obtained distribution is wrapped in the range of -(pi) to (pi) . Therefore, a real-time phase unwrapping process is required. The present paper proposes a new unwrapping method using a composite rectangular grid which si composed of two rectangular waves of different pitches. The composite rectangular grid is projected onto an object. Each phase distribution of the two waves can be separated and calculated using the integrated phase-shifting method. The unwrapped phase distribution is produced from the two different phase distributions.

Citation Download Citation

K. Iwai, Yoshiharu Morimoto, Motoharu Fujigaki, and Satoru Yoneyama "Phase-unwrapping method in real-time shape measurement using composite rectangular grid", Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); https://doi.org/10.1117/12.468844

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