Fast 3D Imaging Using Modulation Analysis

This paper proposes a method of fast 3D imaging using modulation analysis. Two orthogonal gratings through a beam splitter are vertically projected on an object surface, and the tested object is placed between the imaging planes of the two gratings. Then the image of the object surface modulated by the orthogonal gratings can be obtained by a CCD camera from the same direction. The image is processed by the Fourier transform, directional filtering in spatial frequency domain and reverse Fourier transform. Using the modulation distributions of two grating patterns, we can reconstruct the 3D shape of the tested object. In this paper the principle of the 3D imaging, the set-up of the system, and some primary experiment results are proposed.