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dc.contributor.authorLawrence, Jason
dc.contributor.authorBen-Artzi, Aner
dc.contributor.authorDeCoro, Christopher
dc.contributor.authorMatusik, Wojciech
dc.contributor.authorPfister, Hanspeter
dc.contributor.authorRamamoorthi, Ravi
dc.contributor.authorRusinkiewicz, Szymon
dc.date.accessioned2011-02-15T20:43:50Z
dc.date.issued2006
dc.identifier.citationLawrence, Jason, Aner Ben-Artzi, Christopher Decoro, Wojciech Matusik, Hanspeter Pfister, Ravi Ramamoorthi, and Szymon Rusinkiewicz. 2006. Inverse shade trees for non-parametric material representation and editing. ACM Transactions on Graphics 25(3): 735-745.en_US
dc.identifier.issn0730-0301en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:4726188
dc.description.abstractRecent progress in the measurement of surface reflectance has created a demand for non-parametric appearance representations that are accurate, compact, and easy to use for rendering. Another crucial goal, which has so far received little attention, is editability: for practical use, we must be able to change both the directional and spatial behavior of surface reflectance (e.g., making one material shinier, another more anisotropic, and changing the spatial "texture maps" indicating where each material appears). We introduce an Inverse Shade Tree framework that provides a general approach to estimating the "leaves" of a user-specified shade tree from high-dimensional measured datasets of appearance. These leaves are sampled 1- and 2-dimensional functions that capture both the directional behavior of individual materials and their spatial mixing patterns. In order to compute these shade trees automatically, we map the problem to matrix factorization and introduce a flexible new algorithm that allows for constraints such as non-negativity, sparsity, and energy conservation. Although we cannot infer every type of shade tree, we demonstrate the ability to reduce multi-gigabyte measured datasets of the Spatially-Varying Bidirectional Reflectance Distribution Function (SVBRDF) into a compact representation that may be edited in real time.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherAssociation for Computing Machineryen_US
dc.relation.isversionofdoi:10.1145/1141911.1141949en_US
dash.licenseLAA
dc.subjectBRDFen_US
dc.subjectSVBRDFen_US
dc.subjectdata-drivenen_US
dc.subjectlight reflection modelsen_US
dc.subjectmatrix factorizationen_US
dc.subjectnon-parametricen_US
dc.titleInverse Shade Trees for Non-Parametric Material Representation and Editingen_US
dc.typeJournal Articleen_US
dc.description.versionAccepted Manuscripten_US
dc.relation.journalACM Transactions on Graphicsen_US
dash.depositing.authorPfister, Hanspeter
dc.date.available2011-02-15T20:43:50Z
dc.identifier.doi10.1145/1141911.1141949*
dash.authorsorderedfalse
dash.contributor.affiliatedPfister, Hanspeter
dc.identifier.orcid0000-0002-3620-2582


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