基于漫反射优化的金属表面偏振双向反射分布函数

Polarization Bidirectional Reflection Distribution Function of Metal Surfaces Based on Diffuse Reflection Optimization

为了研究金属表面的偏振特性,分析光与物体相互作用的物理机理。首先,根据微面元散射特性,将目标表面的反射分为镜面反射、漫反射和体散射,并建立了三分量偏振双向反射分布函数模型。然后,利用非线性最小二乘法对模型参数进行优化。基于开源数据的仿真实验结果表明,相比其他函数,该函数拟合的曲线与实测结果更吻合;且描述不同金属表面偏振特性时的精度更高,能准确反映金属材料表面的反射信息,为研究金属表面的偏振特性提供了新思路。

To study the polarization characteristics of metal surfaces,we analyze the physical mechanism of the interaction between light and object.First,the reflection on a target surface is divided into specular reflection,diffuse reflection,and volume scattering according to the scattering characteristics of microfacets,through which a three-component polarization bidirectional reflection distribution function model is built in this paper.Then,the model parameters are optimized by the nonlinear least square method.The simulation results based on open-source data show that in comparison with other functions,the curves fitted by the function are more consistent with the measured results and the polarization characteristics of different metal surfaces can be exactly described;moreover,the reflection information on the surface of metal materials can be accurately disclosed.This study provides new ideas for investigating the polarization properties of metal surfaces.