Minimal Sampling for Effective Acquisition of Anisotropic BRDFs

0463872 - ÚTIA 2017 RIV GB eng J - Journal Article
Vávra, Radomír - Filip, Jiří
Minimal Sampling for Effective Acquisition of Anisotropic BRDFs.
Computer Graphics Forum. Roč. 35, č. 7 (2016), s. 299-309. ISSN 0167-7055. E-ISSN 1467-8659
R&D Projects: GA ČR(CZ) GA14-02652S
Institutional support: RVO:67985556
Keywords : BRDF * anisotropic * measurement
Subject RIV: BD - Theory of Information
Impact factor: 1.611, year: 2016
http://library.utia.cas.cz/separaty/2016/RO/vavra-0463872.pdf

BRDFs are commonly used for material appearance representation in applications ranging from gaming and the movie industry, to product design and specification. Most applications rely on isotropic BRDFs due to their better availability as a result of their easier acquisition process. On the other hand, anisotropic BRDF due to their structure-dependent anisotropic highlights, are more challenging to measure and process. This paper thus leverages the measurement process of anisotropic BRDF by representing such BRDF by the collection of isotropic BRDFs. Our method relies on an anisotropic BRDF database decomposition into training isotropic slices forming a linear basis, where appropriate sparse samples are identified using numerical optimization. When an unknown anisotropic BRDF is measured, these samples are repeatably captured in a small set of azimuthal directions.
Permanent Link: http://hdl.handle.net/11104/0263660