Analytical fitting model for rough-surface BRDF

Optics Express
Ingmar G E Renhorn, Glenn D Boreman

Abstract

A physics-based model is developed for rough surface BRDF, taking into account angles of incidence and scattering, effective index, surface autocovariance, and correlation length. Shadowing is introduced on surface correlation length and reflectance. Separate terms are included for surface scatter, bulk scatter and retroreflection. Using the FindFit function in Mathematica, the functional form is fitted to BRDF measurements over a wide range of incident angles. The model has fourteen fitting parameters; once these are fixed, the model accurately describes scattering data over two orders of magnitude in BRDF without further adjustment. The resulting analytical model is convenient for numerical computations.

References

Feb 16, 2006·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Brian G Hoover, Victor L Gamiz
Feb 16, 2007·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Yinlong Sun
Jul 1, 1996·Applied Optics·D L JordanE Jakeman

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