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Light and Skin Interactions by Aravind Krishnaswamy, Gladimir G. Baranoski

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7.2. Scattering Simulation

The BioSpec model takes into account the following three components of the BDF of a skin specimen: surface reflectance, subsurface reflectance, and transmittance. These components are affected by the refractive index differences at the interfaces, tissue scattering, and absorption of light by skin pigments. In the next sections, we describe how each of these components is simulated. Because of the stochastic nature of the simulations, several random numbers uniformly distributed in the interval [0,1] and represented by ξi (for i = 1..12) are used in the BioSpec formulation.

After computing the Fresnel coefficient (FR) at an interface, a random number ξ1 is obtained. If ξ1FR, then a reflected ray is generated, ...

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