Modeling and analysis of spectral polarization BRDF using dispersion model

The bidirectional reflectance distribution function (BRDF) integrates reflection and scattering phenomena to describe the spatial reflection characteristics of the object surface. A modified spectral expression for the complex refractive index of the medium is established using the Drude-Lorentz dispersion model, and it is substituted into the polarization microfacet BRDF to obtain a spectral polarization BRDF(p-BRDF) based on the microfacet theory. Particle swarm optimization algorithm is used to fit the parameters in the model by combining the complex refractive index data and in-plane BRDF data of brass, the optimal standard mean squared error of parameter selection is 0.01. The simulated data is highly consistent with the experimental data, and the optimal adjusted R² is 0.9854. The results indicate that the spectral p-BRDF model combined with limited experimental data can effectively predict the spatial reflection characteristics of object surfaces.