Estimating Specular Roughness and Anisotropy from Second Order Spherical Gradient Illumination
Loading...
Date
2009
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association and Blackwell Publishing Ltd
Abstract
This paper presents a novel method for estimating specular roughness and tangent vectors, per surface point, from polarized second order spherical gradient illumination patterns. We demonstrate that for isotropic BRDFs, only three second order spherical gradients are sufficient to robustly estimate spatially varying specular roughness. For anisotropic BRDFs, an additional two measurements yield specular roughness and tangent vectors per surface point. We verify our approach with different illumination configurations which project both discrete and continuous fields of gradient illumination. Our technique provides a direct estimate of the per-pixel specular roughness and thus does not require off-line numerical optimization that is typical for the measure-and-fit approach to classical BRDF modeling.
Description
@article{10.1111:j.1467-8659.2009.01493.x,
journal = {Computer Graphics Forum},
title = {{Estimating Specular Roughness and Anisotropy from Second Order Spherical Gradient Illumination}},
author = {Ghosh, Abhijeet and Chen, Tongbo and Peers, Pieter and Wilson, Cyrus A. and Debevec, Paul},
year = {2009},
publisher = {The Eurographics Association and Blackwell Publishing Ltd},
ISSN = {1467-8659},
DOI = {10.1111/j.1467-8659.2009.01493.x}
}