Multiple Scattering Properties Based on Modified Microsurface pBRDF Model

Abstract

Scattering polarization properties are one of the main characteristics of a target. Different material types of the target surface can be expressed by the scattering polarization properties, and the use of polarization to characterise the target more effectively is a highly interesting topic. However, the existing polarized bidirectional reflection distribution function (pBRDF) based on microfacet theory for modelling light transmission over rough surfaces is not general. Modelling the scattering phenomena accurately on microsurfaces from a single specularly polarized reflection to full consideration of diffuse polarization remains a challenging task. In this work, we further introduce a directional diffuse reflection lobe to completely define the polarization properties of light in scattering, and revisit the microsurface in the masking and shadowing function part of the model, expanding the traditional symmetric V-groove structure, which is complemented by an asymmetric V-groove structure to improve the accuracy of the model description. We verify through a series of simulations and experiments that our model is in better agreement with the actual truth and that it is more suitable for describing the scattering polarization properties of most targets.