Estimating Specular Roughness and Anisotropy from Second Order Spherical Gradient Illumination

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...

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Bibliographic Details
Published in:Computer graphics forum Vol. 28; no. 4; pp. 1161 - 1170
Main Authors: Ghosh, Abhijeet, Chen, Tongbo, Peers, Pieter, Wilson, Cyrus A., Debevec, Paul
Format: Journal Article
Language:English
Published: Oxford, UK Blackwell Publishing Ltd 01.06.2009
Subjects:
Computer graphics
Computer Graphics [I.3.7]: Three-Dimensional Graphics and Realism
Computer science
Estimating techniques
Light
Optimization
ISSN:0167-7055, 1467-8659
Online Access:Get full text
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Summary: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.
Bibliography:istex:4BF1CC071B965153AE3B6691F766AD019719C15D
ArticleID:CGF1493
ark:/67375/WNG-86GH83WK-H
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ISSN:0167-7055
1467-8659
DOI:10.1111/j.1467-8659.2009.01493.x