Bidirectional reflectance distribution factor and gloss scales

Gaiel Obein; Thierry R. Leroux; Francoise Vienot

doi:10.1117/12.429491

8 June 2001 Bidirectional reflectance distribution factor and gloss scales

Gaiel Obein, Thierry R. Leroux, Francoise Vienot

Proceedings Volume 4299, Human Vision and Electronic Imaging VI; (2001) https://doi.org/10.1117/12.429491
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

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.

Citation Download Citation

Gaiel Obein, Thierry R. Leroux, and Francoise Vienot "Bidirectional reflectance distribution factor and gloss scales", Proc. SPIE 4299, Human Vision and Electronic Imaging VI, (8 June 2001); https://doi.org/10.1117/12.429491

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