基于双步菲涅尔衍射的曲面计算机全息图快速生成方法  

Fast calculation method for curved computer-generated hologram based on Double-step Fresnel Diffraction

作　　者：余爽 皮大普 康睿丹 刘娟 YU Shuang;PI Dapu;KANG Ruidan;LIU Juan(Beijing Engineering Research Center for Mixed Reality and New Display Technology,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院北京市混合现实与新型显示工程技术研究中心,北京100081

出　　处：《光学技术》2021年第3期271-276,共6页Optical Technique

基　　金：国家自然科学基金(61975014);国家重点研发项目(2017YFB1002900)。

摘　　要：曲面计算机全息图可以增加全息显示的视场。然而,繁重的计算量仍然是实时生成曲面计算机全息图的阻碍。提出了一种基于双步菲涅尔衍射的曲面计算机全息图快速生成方法。该方法包括两个步骤:第一步是使用双步菲涅耳衍射生成平面计算机全息图,第二步是根据光衍射传播定律将平面计算机全息图补偿为曲面计算机全息图。数值模拟结果表明,与使用点源法直接计算相比,计算时间明显缩短,重建图像的质量满足人眼的观看需求。光学实验结果与数值模拟结果吻合。预期该方法可以在未来的实时曲面全息显示中得到广泛应用。Curved Computer-Generated Hologram(CCGH) can increase the Field of View(FOV) in holographic display. However, the huge data processing is still a challenge for real-time display. A fast calculation method for CCGH based on double-step Fresnel Diffraction(DSF) is proposed. The method includes two steps: the first step is to use DSF to generate a planar computer-generated hologram, and the second step is to compensate the planar computer-generated hologram into a curved computer-generated hologram according to the law of light diffraction propagation. Numerical simulation results show that compared with the direct calculation using the point source method, the calculation time is greatly shortened, and the quality of the reconstructed image meets the viewing needs of the human eye. The optical experiment results are consistent with the numerical simulation results. It is expected that the proposed method can be widely used in real-time curved holographic display in the future.

关 键 词：菲涅尔衍射 全息显示 快速生成 计算机全息图 菲涅耳衍射 光学实验 光衍射 重建图像 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]