Data Driven Investigation into the Off- Axis BRDF to Develop an Algorithm to Classify Anisotropicity

Abstract

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 \phi_s = \pi, such symmetry was not maintained about the \theta_s = \theta_i 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.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2021
Accession Number
AD1145758

Entities

People

  • Anne W. Werkley

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Algorithms
  • Classification
  • Computer Graphics
  • Data Processing
  • Detection
  • Detectors
  • Diffraction
  • Distribution Functions
  • Electromagnetic Radiation
  • Helium Neon Lasers
  • Image Processing
  • Materials
  • Orientation (Direction)
  • Remote Sensing
  • Scene Generation
  • United States Government

Fields of Study

  • Physics

Readers

  • Allergy and Immunology.
  • Atmospheric Remote Sensing.
  • Calculus or Mathematical Analysis