Dichromatic reflectance model

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In Shafer’s dichromatic reflection model[1], scene radiance has two components:

λ is the wavelength,
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[2]

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.[2]


  1. ^ Shafer, S.A. Using color to separate reflection components Color: Research and Application, Volume 10, Issue 4, pp. 210-218, December, 1985.
  2. ^ 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.

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