Dichromatic reflectance model

In Shafer’s dichromatic reflection model, scene radiance has two components:

${\displaystyle L(\lambda )=m_{\mathrm {b} }c_{\mathrm {b} }(\lambda )+m_{\mathrm {s} }c_{\mathrm {s} }(\lambda )\,}$
cb is the body reflected component
cs is the surface (interface) reflected component
mb and ms are scale factors depending on illumination, view directions and surface orientation.

Separation algorithm

BREN (body reflection essence-neuter) model based[1]

Body essence is an entity invariant to interface reflection, and has two degrees of freedom. The Gaussian coefficient generalizes a conventional simple thresholding scheme, and it provides detailed use of body color similarity.[1]

References

1. ^ a b C. Je and H.-M. Park. BREN: Body Reflection Essence-Neuter Model for Separation of Reflection Components. Optics Letters, Volume 40, Issue 9, pp. 1940-1943, May 1, 2015.