Adaptive highlights stencils for modeling of multi-axial BRDF anisotropy

0452917 - ÚTIA 2017 RIV DE eng J - Journal Article
Filip, Jiří - Havlíček, Michal - Vávra, Radomír
Adaptive highlights stencils for modeling of multi-axial BRDF anisotropy.
Visual Computer. Roč. 33, č. 1 (2017), s. 5-15. ISSN 0178-2789. E-ISSN 1432-2315
R&D Projects: GA ČR(CZ) GA14-02652S
Institutional support: RVO:67985556
Keywords : anisotropic * Highlight * stencils * BRDF * model
OECD category: Applied mathematics
Impact factor: 1.036, year: 2017
http://library.utia.cas.cz/separaty/2016/RO/filip-0452917.pdf

Directionally dependent anisotropic material appearance phenomenon is widely represented using bidirectional reflectance distribution function (BRDF). This function needs in practice either reconstruction of unknown values interpolating between sparse measured samples or requires data fidelity preserving compression forming a compact representation from dense measurements. Both properties can be, to a certain extent, preserved by means of analytical BRDF models. Unfortunately, the number of anisotropic BRDF models is limited, and moreover, most require either a demanding iterative optimization procedure dependent on proper initialization or the user setting parameters. Most of these approaches are challenged by the fitting of complex anisotropic BRDFs. In contrast, we approximate BRDF anisotropic behavior by means of highlight stencils and derive a novel BRDF model that independently adapts such stencils to each anisotropic mode present in the BRDF. Our model allows for the fast direct fitting of parameters without the need of any demanding optimization.
Permanent Link: http://hdl.handle.net/11104/0257066