Calculation method for CGH considering smooth shading with polygon models

Kazuhiro Yamaguchi; Tsubasa Ichikawa; Yuji Sakamoto

doi:10.1117/12.874404

Abstract

Computer generated hologram (CGH) can reconstruct 3-D objects as perfectly well as can optical holography. However, the reality of the reconstructed objects is lower than that of optical holography. This problem is caused by a lack of rendering techniques for CGH. To improve the reality of objects reconstructed by CGH, we have studied rendering techniques in computer graphics such as reflectance distributions for CGH. Reflectance distributions represent a material of an object surface, and objects with various reflectance distributions are reconstructed by using the previous work. In this paper, we improved on the previous work by using polygon models and shading techniques for CGH. The shading technique is also established in computer graphics, and it can render objects having a smooth luminance without using many polygons. A polygon model made up of many polygons is rendered the same as a polygon model made up of few polygons by using shading technique. However, the calculation time of CGH increases with the number of polygon, so it is necessary for CGH to reconstruct objects of high reality from polygon models made up of few polygons. Taking into account the shading technique, polygon models with few planer patches are reconstructed with smooth luminance. We carried out computational and optical reconstructions as experiments. We report the results of these experiments and show the effectiveness of our proposed method.

Citation Download Citation

Kazuhiro Yamaguchi, Tsubasa Ichikawa, Yuji Sakamoto, "Calculation method for CGH considering smooth shading with polygon models", Proc. SPIE 7957, Practical Holography XXV: Materials and Applications, 795706 (7 February 2011); doi: 10.1117/12.874404; https://doi.org/10.1117/12.874404

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