Showing papers by "Jumpei Tsujiuchi published in 1989"
TL;DR: A radial shearing interferometer with two equispaced circular gratings is described for obtaining a constant radial displacement of the test wavefront and it is shown that the deflection and misalignment of the gratings will not appear in the interferogram by using the holographic production method.
Abstract: A radial shearing interferometer with two equispaced circular gratings is described for obtaining a constant radial displacement of the test wavefront. The procedure for the fringe analysis is shown by applying the Fourier transform method to the circular fringe pattern for precisely obtaining the differentiation of the test wavefront. A novel method is also shown for holographically making the equispaced circular gratings by using a cylindrical mirror and a collimating lens. It is shown that the deflection and misalignment of the gratings will not appear in the interferogram by using the holographic production method.
24 citations
25 May 1989
TL;DR: In this paper, a liquid-crystal television receiver was used as a spatial light modulator instead of a silver-halide movie film, which can be observed with high contrast. But, some noise which is caused by LCTV is also observed.
Abstract: Multiplrex Holograms are printed by using a liquid-crystal television receiver as a spatial light modulator instead of silver-halide movie film. Reconstructed 3-D images of wire-frame model can be observed with high contrast. But, some noise which is caused by LCTV is also observed.
17 citations
TL;DR: A direct 3-D reconstruction, which is much better in terms of higher spatial resolution and smaller X-ray dosage, is used to extract the bone's shape.
Abstract: Three-dimensional reconstruction of a bone image is important in medicine to facilitate making artificial bones by numerical control and to achieve computer simulations of surgical operations. Instead of gathering sectional tomograms obtained by computer tomography, a direct 3-D reconstruction, which is much better in terms of higher spatial resolution and smaller X-ray dosage, is used to extract the bone's shape. A proposal and an experimental result are presented in this paper.
7 citations
TL;DR: A “Dual Sampling Method (DSM)” is proposed, which can effectively suppress the moire fringes by carrying out twice sampling procedures with different sampling ratio.
3 citations