光学学报, 2018, 38 (5): 0526001, 网络出版: 2019-04-30
基于六参量偏振BRDF模型的地物背景偏振反射
Polarized Reflectance Properties for Ground-Feature’s Background Based on Six-Component pBRDF Model
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
Abstract
To represent the polarized reflectance properties of ground-feature’s background, we present a six-component 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.
杨敏, 方勇华, 吴军, 崔方晓. 基于六参量偏振BRDF模型的地物背景偏振反射[J]. 光学学报, 2018, 38(5): 0526001. 杨敏, 方勇华, 吴军, 崔方晓. Polarized Reflectance Properties for Ground-Feature’s Background Based on Six-Component pBRDF Model[J]. Acta Optica Sinica, 2018, 38(5): 0526001.