中国激光, 2014, 41 (7): 0701001, 网络出版: 2014-04-29   

空域计算全息三维成像技术

Spatial-Domain Computer Generated Holographic Three-Dimensional Display
作者单位
中山大学理工学院光电材料与技术国家重点实验室, 广东 广州 510275
摘要
近年来在光信息技术和计算机等技术的推动下,三维显示技术发展迅猛。全息技术由于能满足人眼各种视觉效应而备受关注。计算全息作为全息技术和计算机技术的结合体,能灵活地将存储于计算机内部的物体数据通过光学手段进行重现。然而,计算耗时、再现可视角过小成为了其发展的两大制约因素。通过证明夫琅禾费计算全息能应用于菲涅耳区域的三维显示,系统地介绍了自主开发的空域夫琅禾费计算全息方法,并以该算法为基础,进一步解决了面编码相息图中若干问题,如明暗、遮挡、纹理等。同时,利用等效弧形阵列原理,搭建了一套时空复用的4f光学系统,提高了空间带宽积,实现了宽视角全息三维成像。研究成果能直接移植到三维场景的计算和大型的数据源,为高分辨率动态全息三维显示发展提供了坚实的理论和实验基础。
Abstract
Three-dimensional (3D) display has been made great progress in recent years due to the development of the fields on optical information and computer science technologies. Holography enables to provide accurate depth cues of 3D objects and has attracted much attention. Computer generated hologram (CGH) is one of the exceptional way to utilize vivid 3D scene of both virtual and real objects. However, time-consuming holographic computation and ultra-narrow viewing angle are two main disadvantages. The provement on the computer Fraunhofer formulism in Fresnel region is reviewed. Spatial-domain Fraunhofer CGH algorithm, a method, which is used to generate hologram of polygon-based 3D model is systematically introduced. Based on this method, the problems on occlusion, shading, and texture are solved. Also a 4f optical system by time division multiplexing and spatial tiling technique is reviewed. This method can be used in the computation of other complicated 3D scenes with large amounts of data, which is helpful to the development of holographic display.

董建文, 陈定尘, 庞晓宁, 刘远致, 许宗玺. 空域计算全息三维成像技术[J]. 中国激光, 2014, 41(7): 0701001. Dong Jianwen, Chen Dingchen, Pang Xiaoning, Liu Yuanzhi, Xu Zongxi. Spatial-Domain Computer Generated Holographic Three-Dimensional Display[J]. Chinese Journal of Lasers, 2014, 41(7): 0701001.

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