Data Driven Investigation into the Off-Axis BRDF to Develop an Algorithm to Classify Anisotropicity
Date of Award
Master of Science in Applied Physics
Department of Engineering Physics
Samuel D. Butler, PhD
The Bi-directional Reflectance Distribution Function (BRDF) is used to describe reflectances of materials by calculating the ratio of the reflected radiance to the incident irradiance. While it was found that isotropic BRDF microfacet models maintained symmetry about ɸs = π, such symmetry was not maintained about the θs = θi axis, except for close to the specular peak. This led to development of a novel data-driven metric for how isotropic a BRDF measurement is. Research efforts centered around developing an algorithm that could determine material anisotropy without having to fit to models. The algorithm developed here successfully classified the degree of anisotropicity in 4 out of 5 samples.
DTIC Accession Number
Werkley, Anne W., "Data Driven Investigation into the Off-Axis BRDF to Develop an Algorithm to Classify Anisotropicity" (2021). Theses and Dissertations. 5025.