非视域成像中的中介面散射特性与成像仿真  

Simulation of Light Scattering and Imaging of Relay Wall in Non-Line-of-Sight Imaging

作　　者：方宇杰 王霞[1,2] 孙志斌 苏秉华 Fang Yujie;Wang Xia;Sun Zhibin;Su Binghua(Key Laboratory of Optoelectronic Imaging Technology and System,Ministry of Education,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Technology,Zhuhai,Zhuhai 519000,Guangdong,China;National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081 [2]北京理工大学珠海学院,广东珠海519085 [3]中国科学院国家空间科学中心,北京100190 [4]中国科学院大学,北京100049

出　　处：《光学学报》2023年第4期230-239,共10页Acta Optica Sinica

基　　金：国家自然科学基金(62031018,61274024,61474123);国家重点研究开发项目(2016YFE0131500);广东省普通高校重点领域专项(2021ZDZX3012,2021B0707010001)。

摘　　要：中介面与目标表面光学散射特性对成像结果有直接影响,目前各种非视域成像方法多针对朗伯体中介面进行计算成像,系统结构复杂且成本昂贵。然而,应用场景中的常见材料均为非朗伯体,故基于中介面材料的双向反射分布理论,提出了一种材料散射特性描述方法。通过设置中介面中所包含的不同散射成分,经过大量光线追迹,实现了对非视域目标光强信号的追踪与仿真。仿真成像结果采用标准差进行评价,通过多因素方差分析,定量讨论了不同散射成分组合与非视域成像质量之间的关系。分析结果表明,材料中高斯散射角对非视域成像质量有显著影响。Objective Applying computational imaging to behind the obstruction or other out-of-sight targets by virtue of relay walls is called non-line-of-sight imaging(NLOS).NLOS technology has great application potential in the fields of medical care,national defense,road safety,and scientific research.It can extend the range of human observation in scenarios where devices or human eyes cannot see.The existing NLOS technologies mainly include transient imaging,range-gated imaging,and passive NLOS imaging.These methods are mostly dedicated for Lambert reflector relay walls,featuring complex system structure,low imaging speed and high cost.However,the common materials in application scenarios are all non-Lambert reflectors.To this end,based on the bidirectional reflection distribution theory on relay wall materials,this paper proposes a material scattering characteristic description method,which realizes light intensity signal tracking and simulation of targets out of sight by configuring different scattering components of the relay wall and conducting massive ray tracing.The simulation work can provide a theoretical basis and experimental basis for the practical application of passive NLOS technologies,and provide a reference for relay wall selection,so it is of practical application significance.Methods Since there are many kinds of relay walls actually used for NLOS,with quite different scattering characteristics,it is difficult to find a standardized material.Therefore,this paper proposes a material scattering description model based on the traditional bidirectional reflectance distribution function(BRDF)to define the scattering characteristics by composition.Firstly,it is assumed that the scattering characteristics of relay wall materials are described by a combination of specular reflection,Lambert scattering,and Gaussian scattering,with transmission light and superficial stochastic scattering ignored.Then,different combinations of the scattering components are set separately to image the scattered light spots on rela

关 键 词：散射 计算成像 光数据处理 成像分析 

分 类 号：O411.3[理学—理论物理]