高分辨率多视点动态全息3D显示  

High-Resolution Multiview Dynamic Holographic 3D Display

作　　者：许富洋[1,2] 杨鑫 姚建云 刘子陌 宋强 李勇 Xu Fuyang;Yang Xin;Yao Jianyun;Liu Zimo;Song Qiang;Li Yong(Institute of Information Optics,Zhejiang Normal University,Jinhua,Zhejiang 321004,China;Key Laboratory of Researching Optical Information Detecting and Display Technology in Zhejiang Province,Jinhua,Zhejiang 321004,China;School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Lochn Optics&Micro Nano Photonics Research Center of Hunan University,Shenzhen,Guangdong 518000,China)

机构地区：[1]浙江师范大学信息光学研究所,浙江金华321004 [2]浙江省光信息检测与显示技术研究重点实验室,浙江金华321004 [3]北京航空航天大学仪器科学与光电工程学院,北京100191 [4]珑璟光电&湖南大学微纳光学研究中心,广东深圳518000

出　　处：《中国激光》2021年第1期152-159,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(62005006,11674288);浙江省高等教育“十三五”第二批教改项目(jg20190097)。

摘　　要：提出了一种高分辨率多视点动态全息3D显示方法,观看视点位置变化时,观看者能够看到连续变化的3D效果。在进行全息图计算时,首先根据针孔阵列投影模型,渲染3D动画中每一帧3D模型的光场图像序列;然后从已渲染的多组光场图像序列中抽取对应视角信息的光场图像进行融合,得到融合后的动态光场图像序列;在进行全息图编码时,以动态光场图像序列中的一帧图像作为物光振幅,以来自于针孔的发散球面波的相位作为物光相位,引入平面参考光进行编码,得到一个单元全息图。由于每个单元全息图的计算是相互独立的,因此在计算过程中使用并行加速计算,实现了尺寸为32 mm×32 mm、分辨率为100000 pixel×100000 pixel的高分辨率全息图,其光场图像融合和全息编码的时间仅需27 min。光学再现结果证明了该方法的可行性。所提出的高分辨率多视点动态全息3D显示方法在全息包装和3D广告等领域具有广泛的应用前景。Objective Holographic 3 D display has gained considerable attention owing to its ability to completely reproduce the wavefront information of a 3 D scene.To reconstruct a real and virtual 3 D scene,computer-generated hologram(CGH)is found to be more flexible than optical holography.The CGH has two main branches,namely,the dynamic holography reconstructed by liquid crystals on silicon(LCoS)and the static high-resolution holography realized by photolithography.However,due to the large pixel size and low-resolution,dynamic holographic 3 D display based on LCoS can only achieve a small field of view and small display size,thus limiting its application.High-resolution CGH can be calculated and printed using photolithography and copied for mass production.However,the computational time is a big challenge.To overcome this challenge,holography is regarded as an information encoding method,which is employed to encode light-field images,thereby significantly reducing the calculation time.Moreover,highresolution holography can only reproduce a static 3 D image,indicating that the viewer can see the perspective information of the 3 D image from different angles,but with a static 3 D image.Thus,more vivid holographic 3 D display needs to be realized.In this study,multiview dynamic holographic 3 D display is proposed by coding the dynamic light-field images fused from multiple rendered light-field images via 3 D animation.In this new display,the viewer can see a 3 D dynamic image when the viewpoint changes.Methods In the hologram calculation,the sequence of the light-field image of each frame of the 3 D model in the 3 D animation was first rendered according to the pinhole array projection model.Then,the light-field images that correspond to the view angle information were extracted from the rendered multiple sets of light-field image sequences and fused to achieve the fused dynamic light-field image sequence.In the hologram coding,the frame of images in the dynamic light-field image sequence was taken as the object light ampl

关 键 词：全息 全息3D显示 计算全息 高分辨率全息 动态全息显示 光场图像渲染 

分 类 号：O438.1[机械工程—光学工程]