几何光场三维成像综述  

3D Imaging Using Geometric Light Field:A Review

作　　者：殷永凯 于锴 于春展 白雪纯 蔡泽伟 孟祥锋[1] 杨修伦[1] Yin Yongkai;Yu Kai;Yu Chunzhan;Bai Xuechun;Cai Zewei;Meng Xiangfeng;Yang Xiulun(School of Information Science and Engineering,Shandong University,Qingdao,Shandong 266237,China;School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing,Jiangsu210094,China)

机构地区：[1]山东大学信息科学与工程学院,山东青岛266237 [2]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《中国激光》2021年第12期287-306,共20页Chinese Journal of Lasers

基　　金：国家自然科学基金(61405122,61675117,61775121);中德科学中心合作交流项目(M-0044);山东省自然科学基金(ZR2019QF006)。

摘　　要：光场成像拓展了经典光学成像的信息维度,为成像技术的提升和突破提供了更多的可能性,是计算成像领域的重要研究内容。光场携带了目标和场景的三维信息,通过对光场数据进行合理的建模和处理可以实现三维成像。光场三维成像技术可概括为光场深度估计和光场三维重建两大类。对于光场深度估计,根据深度计算的不同机理分为基于多视点立体的方法与基于极平面图的方法;对于光场三维重建,根据是否采用结构光照明分为主动和被动光场三维重建。简要介绍了光场的基本理论并回顾了常见的光场采集系统,分类介绍了光场三维成像的关键技术和典型工作并进行了技术展望。Significance Light field imaging expands classical optical imaging and provides possibilities for advancement in imaging technology.It has continued to become a major research interest in the field of computational imaging.While,objects and scenes in nature are all three-dimensional(3D)entities,and traditional imaging systems only record two-dimensional(2D)images.From geometry,traditional imaging is equivalent to the 2Dprojection on the image plane of a 3Dobject in space.Therefore,the depth information is lost during projection.To restore the object,or perform quantitative analysis on the shape,position,and internal structure of the object,we reconstruct the missing depth information and 3Dstructure from the 2Dimages.This process and related techniques are referred to as 3Dimaging and have become an essential support technique with applications in areas such as biological imaging,industrial inspection,automatic navigation,and virtual reality.Among several methods for 3D imaging,light field imaging is a major approach.Progress This paper introduces the basic theory of light field while reviewing common systems for light field capture.Key techniques and typical works in light field 3Dimaging according to the categorization are discussed.For emphasis,this paper limits its discussion to geometric optics,thus only paying attention to the intensity distribution of rays in 3Dspace,i.e.,the geometric light field.A light field refers to the distribution of radiance carried by rays in 3Dspace.For monochromatic and static cases,a light field is described using a five-dimensional(5D)plenoptic function.Since radiance remains unchanged along a ray unless blocked,the 5Dfunction reduces to four-dimensional(4D)function in free space.The major challenge choosing a representation for the 4Dlight field is parameterizing the space of oriented rays.The most common model parameterizes rays using their intersections with two parallel planes(Fig.1).The advantages of this representation are that planes can be placed at infinity,and then r

关 键 词：计算成像 光场成像 三维成像 光场相机 全光函数 极平面图 

分 类 号：O439[机械工程—光学工程]