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Proceedings Paper

Bidirectional reflectance distribution factor and gloss scales
Author(s): Gaiel Obein; Thierry R. Leroux; Francoise Vienot
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Paper Abstract

Gloss is a visual attribute, which, as well as color, provides qualitative information on the surrounding objets. The relevant physical quantity for gloss measurement is the BRDF that characterizes the geometrical distribution of the reflected light on the sample. We hypothesize that the light reflection on a glossy sample is split in 2 parts. The volume diffusion and the surface reflection. We assume that the surface of the sample consists of tiny mirror facets the orientation of which is specific of the surface microstructure. Each facet is the source of specular reflection. With this hypothesis, we have calculated a theoretical model of the BRDF according to Fresnel laws. We have applied the model to black and white painted samples of various gloss indexes. In addition, we have acquired real measurements of the BRDF of the same samples by using a new device which gives the compete measurement of the luminance geometrical distribution in the hemisphere. The comparison of the measurements and the theoretical model shows that, for this series of samples, the facet hypothesis is reliable and makes it possible to model the real BRDF in all directions.

Paper Details

Date Published: 8 June 2001
PDF: 12 pages
Proc. SPIE 4299, Human Vision and Electronic Imaging VI, (8 June 2001); doi: 10.1117/12.429491
Show Author Affiliations
Gaiel Obein, Museum National d'Histoire Naturelle (France)
Thierry R. Leroux, Electronics for Displays and Imaging Devices (France)
Francoise Vienot, Museum National d'Histoire Naturelle (France)

Published in SPIE Proceedings Vol. 4299:
Human Vision and Electronic Imaging VI
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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