基于聚合物分散液晶薄膜的光场透视混合现实显示系统  

See-Through Light Field Mixed-Reality Display System Based on Polymer Dispersed Liquid Crystal Film

作　　者：陈思 李晖[1,2] 李甜 苏晨博 吴云韬 Chen Si;Li Hui;Li Tian;Su Chenbo;Wu Yuntao(School of Computer Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,Hubei,China;Hubei Key Laboratory of Intelligent Robot,Wuhan 430205,Hubei,China)

机构地区：[1]武汉工程大学计算机科学与工程学院,湖北武汉430205 [2]智能机器人湖北省重点实验室,湖北武汉430205

出　　处：《光学学报》2024年第14期92-102,共11页Acta Optica Sinica

基　　金：国家自然科学基金(51703071,61771353);湖北省自然科学基金创新群体项目(2023AFA035);武汉市知识创新计划-基础研究(2022010801010350);智能机器人湖北省重点实验室(HBIRL202203);教育部数码激光成像与显示工程研究中心开放课题(SDGC2134);信息探测与处理山西省重点实验室开放基金(2023-001);武汉工程大学研究生创新基金(CX2022329、CX2023298、CX2023299);武汉工程大学校长基金(XZJJ2023033)。

摘　　要：为了解决视觉辐辏调节冲突(VAC)问题,本文提出了一种基于聚合物分散液晶薄膜(PDLC)的光场透视混合现实显示系统。该系统利用PDLC的电控可调透过率特性,将投影目标物体的光场信息与真实场景进行有效融合;并基于凸优化理论,提出了适配的光场渲染算法;联合PDLC不同电压下目标物体光场信息的冗余性,以及真实场景与目标物体色彩亮度差异,生成了不同焦深下和谐化虚实场景融合的二维图像。实验结果表明,所提出的系统能呈现高质量、连续焦深和谐化虚实场景融合效果。该系统计算量小、硬件成本低、融合效果佳,可有效解决VAC问题,在透视混合现实显示领域具有极大的应用潜力。Objective With rapid development, mixed-reality display systems are increasingly utilized in various fields, such as entertainment, education, and simulation training. However, prolonged use of these systems often leads to visual discomfort for users, posing a significant challenge in this area. The primary cause of user discomfort is the visual accommodation-convergence conflict(VAC), where current mixed-reality display systems often fail to provide the correct focal point. This failure can cause a conflict between the eye's accommodation and convergence mechanisms, leading to visual strain and discomfort. Utilizing liquid crystal elements in see-through, mixed-reality display systems can resolve the VAC problem. However, the fabrication of liquid crystal devices in these methods is complex, and maintaining high precision in manual production processing is also challenging, potentially affecting the quality of the virtual reality. Hence,there is a pressing need for a simple method in enhanced display systems. We propose a novel approach to achieve seethrough light field mixed-reality using polymer dispersed liquid crystal(PDLC), specifically designed to address the visual VAC. The proposed system leverages the electrically adjustable transmittance property of PDLC to seamlessly combine the light field data of the projected target in the real world. A light field rendering algorithm is introduced based on convex optimization theory, which effectively fuses the light field redundancy across different PDLC voltages and the color brightness disparities between the actual scene and the target. This integration generates a visually harmonious image containing the virtual and real fused scenes at varying focal depths. Experiments demonstrate that the proposed system achieves superior quality at a continuous focal depth. The proposed system offers several advantages, including reduced computational demands and affordable hardware expenses.Methods The system utilizes PDLC as the core optical element, enabling the combina

关 键 词：透视混合现实显示 聚合物分散液晶 光场渲染 虚实融合 正则化约束 

分 类 号：O436[机械工程—光学工程]