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A psychophysically validated metric for bidirectional texture data reduction
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SYSNO ASEP 0317592 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title A psychophysically validated metric for bidirectional texture data reduction Title Psychofyzicky ověřená metrika pro redukci BTF texturních dat Author(s) Filip, Jiří (UTIA-B) RID, ORCID
Chantler, M.J. (GB)
Green, P.R. (GB)
Haindl, Michal (UTIA-B) RID, ORCIDSource Title ACM Transactions on Graphics - ISSN 0730-0301
Roč. 27, č. 5 (2008), s. 138:1-138:11Number of pages 10 s. Publication form www - www Language eng - English Country US - United States Keywords Bidirectional Texture Functions ; texture compression Subject RIV BD - Theory of Information R&D Projects 1ET400750407 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GA102/08/0593 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10750506 - UTIA-B (2005-2011) DOI http://doi.acm.org/10.1145/1457515.1409091 Annotation Bidirectional Texture Functions (BTF) are commonly thought to provide the most realistic perceptual experience of materials from rendered images. The key to providing efficient compression of BTFs is the decision as to how much of the data should be preserved. We use psychophysical experiments to show that this decision depends critically upon the material concerned. Furthermore, we develop a BTF derived metric that enables us to automatically set a material's compression parameters in such a way as to provide users with a predefined perceptual quality. We investigate the correlation of three different BTF metrics with psychophysically derived data. Eight materials were presented to eleven naive observers who were asked to judge the perceived quality of BTF renderings as the amount of preserved data was varied. The metric showing the highest correlation with the thresholds set by the observers was the mean variance of individual BTF images. Workplace Institute of Information Theory and Automation Contact Markéta Votavová, votavova@utia.cas.cz, Tel.: 266 052 201. Year of Publishing 2009
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