Real-Time Shape Measurement by Unwrapping Method Using Aliasing

Abstract

We previously proposed a real-time shape measurement method using two-component synthesis grating projection. In the method, phase unwrapping of the projected grating is performed by using aliasing of the Fourier spectrum of the grating images. It requires only 5 images obtained for one-cycle phase-shifting. Each phase in the two-component can be extracted from only 5 phase-shifted grating images. In this paper, we propose a real-time shape measurement system. The theory, the algorithm for the analysis and the experimental results are shown.

OS1-2-2 Calibration Method Using Multiple Reference Planes for Real-time Shape and Deformation Measurement

“…We previously proposed the calibration methods that use two or multiple reference planes [3,4]. In this paper, we propose a calibration method using multiple reference planes with a 2-D grating fixed on the surface for an accurate shape measurement with developing the previously proposed methods.…”