视点密度渐变的大视角三维光场显示  

Large-Angle Three-Dimensional Light Field Display with Gradual Viewpoint Density

作　　者：张庭毓 高鑫 于迅博 温旭东 何金泓 张钊赫 颜玢玢[1] 桑新柱[1] Zhang Tingyu;Gao Xin;Yu Xunbo;Wen Xudong;He Jinhong;Zhang Zhaohe;Yan Binbin;Sang Xinzhu(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]北京邮电大学电子工程学院,北京100876

出　　处：《中国激光》2025年第2期233-243,共11页Chinese Journal of Lasers

基　　金：国家自然科学基金(62175015,61905019,62075016)。

摘　　要：随着虚拟现实技术的日趋成熟,三维光场显示(3D-LFD)逐渐成为研究和产业的焦点,其能够为观众带来无需外部辅助设备的真实立体观看体验。尽管3D-LFD技术展现出广阔的应用前景,但在实际应用中仍面临众多技术难题。视点密度是影响3D-LFD还原度的关键因素。为了提升视点密度,传统方法通常需要增加信息总量,这会使得系统复杂度加大。为此,提出了一种视点密度随观看视角渐变的3D-LFD。该方法在不增加显示面板像素总量的前提下,结合用户的观看习惯和显示深度,为中心观看区域提供所需的密集视点,同时适当降低边缘观看区域的视点数。设计了一种主光线密度渐变的复合透镜阵列(GDLA),能够实现视点密度从视区中心到两侧渐变的分布。结合与视点分布匹配的光场采集与编码方法后,实现了观看视角为100°,视点密度由中心到两侧从2.5个/(°)到1个/(°)渐变的三维光场显示。Objective As technology progresses,especially with the maturation of virtual reality,three-dimensional(3D)light field display(LFD)emerges as a focal point in both scientific research and industry.This technology enables users to view lifelike 3D scenes without any external devices,offering a unique immersive visual experience.In 3D-LFD,the parameters such as viewing angle,spatial resolution,and viewpoint density are essential in assessing the 3D image quality.Moreover,viewpoint density,indicative of the density in constructing 3D scenes,is a critical metric for evaluating the fidelity of 3D-LFD,directly influencing the realism and accuracy of the reconstructed scenes.Recently,our research group has been dedicated to enhancing viewpoint density and a method based on spatial multiplexing for increasing viewpoint density has been proposed,utilizing 64 projectors to capture information of 3D objects from different angles,and then reproducing the spatial information of these objects through a holographic screen in front of the projectors.This method successfully creates a large-scale,true-color,real-time 3D display system with a viewpoint density of 1.42/(°).However,existing methods often face a common challenge:an increase in the total volume of information.In traditional 3DLFD systems,enhancing viewpoint density typically requires more data transmission and processing,leading to increased system complexity and higher demands on computational and bandwidth resources.Furthermore,traditional 3D display technologies have an inherent contradiction:under a fixed volume of information,there is a trade-off among viewing angle,viewpoint density,and spatial resolution.In other words,simply increasing viewpoint density might reduce the viewing angle or spatial resolution.We hope that our strategy and work will be helpful for the design of large-angle 3D-LFDs and the optimization of viewpoint density.Methods Firstly,the impact of viewpoint density on the image quality of 3D-LFD is analyzed.Black and white striped patterns with

关 键 词：几何光学 光场 主光线 视点密度 像差 

分 类 号：TN27[电子电信—物理电子学]