基于六参量偏振BRDF模型的地物背景偏振反射特性研究  

Polarized Reflectance Properties for Ground-Feature's Background Based on Six-Component pBRDF Model

作　　者：杨敏 方勇华 吴军[2] 崔方晓 Yang Min;Fang Yonghua;Wu Jun;Cui Fangxiao(School of Environment Science and Optoelectronic Technology, University of Science and Technology of China, Hefei, Anhui 230036, China;Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese AcademyofScience, Hefei, Anhui 230031, China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230026 [2]中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室,安徽合肥230031

出　　处：《光学学报》2018年第5期265-272,共8页Acta Optica Sinica

基　　金：国家自然科学基金青年基金(41505020)

摘　　要：为研究地物背景的偏振反射特性,综合考虑了镜面反射、体散射和后向散射,建立了一种六参量偏振双向反射分布函数(pBRDF)模型。该模型利用Kubelka-Munk(KM)理论模拟体散射分量,并引入呈高斯分布的后向散射分量,改进了传统的偏振BRDF模型。建立的六参量偏振BRDF模型更加符合地物背景的偏振反射特性。基于多角度偏振测量原理,获得草地和土壤在不同观测几何下的偏振光谱,分析了偏振反射分布特征,并从实测数据中反演了模型参量,将测量值与仿真值进行了对比。结果表明:所建立的六参量偏振BRDF模型的仿真结果与实测数据之间具有很好的吻合性,证实了该模型的准确性与有效性。To represent the polarized reflectance properties of ground-feature＇s background,we present a sixcomponent polarized bidirectional reflectance distribution function（pBRDF）model that takes specular reflection,volume scattering and backscattering into account.The model uses the Kubelka-Munk（KM）theory to simulate the volume scattering component,and introduces a backscattering component of Gaussian distribution,which improves the traditional pBRDF model,and makes the new six-component pBRDF model more suitable to the polarized reflectance properties of ground-feature＇s background.The polarized spectra of grass and soil under the different observation geometries are obtained based on the theory of multi-angular polarization detection.The variation of the polarized spectral reflectance is also analyzed.The simulated polarization values from the six-component model are compared with the measured data.It is shown that a good agreement is obtained between polarization measurement data and simulated results.The accuracy and validity of model are confirmed.

关 键 词：物理光学 偏振 后向散射 双向反射分布函数 地物背景 

分 类 号：O436.3[机械工程—光学工程]