Matsushima Kyoji
Department of Electrical Engineering and Computer Science, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan.
Appl Opt. 2005 Aug 1;44(22):4607-14. doi: 10.1364/ao.44.004607.
Digitally synthetic holograms of surface model objects are investigated for reconstructing three-dimensional objects with shade and texture. The objects in the proposed techniques are composed of planar surfaces, and a property function defined for each surface provides shape and texture. The field emitted from each surface is independently calculated by a method based on rotational transformation of the property function by use of a fast Fourier transform (FFT) and totaled on the hologram. This technique has led to a reduction in computational cost: FFT operation is required only once for calculating a surface. In addition, another technique based on a theoretical model of the brightness of the reconstructed surfaces enables us to shade the surface of a reconstructed object as designed. Optical reconstructions of holograms synthesized by the proposed techniques are demonstrated.
研究了表面模型物体的数字合成全息图，用于重建具有阴影和纹理的三维物体。所提出技术中的物体由平面组成，为每个表面定义的属性函数提供形状和纹理。通过一种基于属性函数旋转变换的方法，利用快速傅里叶变换（FFT）独立计算每个表面发出的场，并在全息图上进行累加。该技术降低了计算成本：计算一个表面仅需进行一次FFT运算。此外，另一种基于重建表面亮度理论模型的技术使我们能够按设计对重建物体的表面进行阴影处理。展示了通过所提出技术合成的全息图的光学重建。
