BMVC 2004, Kingston, 7th-9th Sept, 2004

Fresnel Correction of the Beckmann Model
H. Ragheb (Bu-Ali Sina University, Iran) and E. Hancock (University of

In this paper we suggest a modification to the Beckmann-Kirchhoff model
of rough surface reflectance that can be used for surfaces of intermediate
roughness. One of the problems with the existing Beckmann model is that
it fails for large angles of incidence. This problem was overcome for rough
surfaces by Vernold and Harvey who use a Lambertian form factor. Here we
take this work one step further by using a Fresnel coefficient to account for
subsurface reflectance attenuation. This study also aims to show the existing
modelling gaps between different variants of the Beckmann model.
(pdf article)