Dichromatic reflectance model

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

L(\lambda )=m_{\mathrm {b} }c_{\mathrm {b} }(\lambda )+m_{\mathrm {s} }c_{\mathrm {s} }(\lambda )

λ is the wavelength,

c_b is the body (diffuse) reflected component,

c_s is the surface (interface) (specular) reflected component,

m_b and m_s are scale factors depending on illumination, view directions and surface orientation.

Separation algorithm

BREN (body reflection essence-neuter) model based

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]

References

Shafer, S.A. Using color to separate reflection components Color: Research and Application, Volume 10, Issue 4, pp. 210-218, December, 1985.
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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[Shafer1985-1] Shafer, S.A. Using color to separate reflection components Color: Research and Application, Volume 10, Issue 4, pp. 210-218, December, 1985.

[Je_ol15_bren-2] 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.