Estimating Specular Roughness and Anisotropy from Second Order Spherical Gradient Illumination

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dc.contributor.authorGhosh, Abhijeeten_US
dc.contributor.authorChen, Tongboen_US
dc.contributor.authorPeers, Pieteren_US
dc.contributor.authorWilson, Cyrus A.en_US
dc.contributor.authorDebevec, Paulen_US
dc.date.accessioned2015-02-23T14:56:07Z
dc.date.available2015-02-23T14:56:07Z
dc.date.issued2009en_US
dc.description.abstractThis 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.en_US
dc.description.number4en_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume28en_US
dc.identifier.doi10.1111/j.1467-8659.2009.01493.xen_US
dc.identifier.issn1467-8659en_US
dc.identifier.pages1161-1170en_US
dc.identifier.urihttps://doi.org/10.1111/j.1467-8659.2009.01493.xen_US
dc.publisherThe Eurographics Association and Blackwell Publishing Ltden_US
dc.titleEstimating Specular Roughness and Anisotropy from Second Order Spherical Gradient Illuminationen_US
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EGSR09: 20th Eurographics Symposium on Rendering