含液晶扩散片的高分辨率光场成像系统  

High-resolution light field imaging system using liquid crystal diffuser

作　　者：何燕成 李晖[1,2,3] 钱文彤 吴云韬 HE Yancheng;LI Hui;QIAN Wentong;WU Yuntao(School of Computer Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Hubei Key Laboratory of Intelligent Robot,Wuhan 430205,China;School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;College of Post and Telecommunication,Wuhan Institute of Technology,Wuhan 430205,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 [3]华中科技大学化学与化工学院,湖北武汉400074 [4]武汉工程大学邮电与信息工程学院,湖北武汉430205

出　　处：《光学精密工程》2022年第9期1038-1046,共9页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.51703071,No.61771353);湖北省自然科学基金面上项目(No.2019CFB553);教育部新一代信息技术创新项目(No.2020ITA05049);智能机器人湖北省重点实验室开放基金资助项目(No.HBIR202001,No.HBIRL202101);苏州大学数码激光成像与显示教育部工程研究中心开放基金资助项目(No.SDGC2134);武汉工程大学研究生教育创新基金资助项目(No.CX2021256)。

摘　　要：为解决传统光场相机空间带宽积偏低的问题,提出了一种基于液晶扩散片的光场成像系统。使用光控取向技术进行取向,克服了传统摩擦取向所产生的杂质、静电与物理性损伤等缺陷,制备出适用于光场成像的电控可调液晶扩散片;通过改变液晶扩散片的外加电压,获得了不同电压下的光场信息;通过适配液晶扩散片的成像算法,将高透过率时光场的细节信息与低透过率时光场的散射光强度融合,获得了均衡光强与细节的高分辨率光场信息。与传统光场成像系统相比,所提方法获得的高分辨率光场图像的峰值信噪比整体提升约4.98%,而且成本低、制备简便,实现便捷,有利于制作出高性价比的光场相机,实现高分辨率光场成像。A new light field imaging system based on a liquid crystal diffuser was proposed to address the problem of low spatial bandwidth in conventional light field cameras.Using the light-controlled orientation technique,the electronically adjustable liquid crystal diffuser was prepared for light field imaging by eliminating the impurities and electrostatic defects caused by conventional frictional orientation.The applied voltage was changed to obtain light field information under different voltages.Using the proposed algorithm,the liquid crystal diffuser was adapted to fuse the detailed information under high transmittance and scattered light intensity under low transmittance to obtain high-resolution light field information with balanced light intensity and detail.Compared with the conventional light field imaging system,the proposed method improves the PSNR value of the reconstructed high-resolution light field image by approximately 4.98%.In addition,the proposed method has low cost,simple preparation,convenient implementation,making it suitable for application to cost-effective light field cameras that realize high resolution light field imaging.

关 键 词：光场成像 液晶扩散片 光控取向 空间带宽积 

分 类 号：O439[机械工程—光学工程]