Modeling and simulation of polarization microfacet bidirectional reflectance distribution function
The polarization Bidirectional Reflectance Distribution Function(p-BRDF)can describe the spatial polariza-tion characteristics of the reflected light on an object's surface,and has been widely used in many fields.Based on the mi-crofacet theory,the electric field vectors of polarized incident and reflected light are decomposed and composed by the angle relationship between the microfacet and the object surface,as well as the Fresnel reflection on the microfacet,to obtain the polarization reflectivity.This is then used as the Fresnel reflection term in the Cook-Torrance BRDF model to estab-lish a polarization microfacet BRDF model.Introducing polarization into geometric optical model is simple and has clear physical meaning.The Particle swarm optimization algorithm is used to fit the parameters in the model with the in-plane BRDF experimental data on the brass surface.The standard mean squared error of the model parameter selection is be-tween 0.2820％and 5.7049％,and the best adjusted R2 is 0.9957.The results indicate the feasibility of using the polari-zation microfacet BRDF model to describe the polarization reflection characteristics.
optical measurementpolarization bidirectional reflectance distribution functionmicrofacet theorypo-larization reflectivityparticle swarm optimization
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