Abstract
Skin color is essential to skin and wound assessment as it brings valuable information about skin physiology and pathology. An approach, which can help deconvolute and isolate various mechanisms affecting skin color, could be helpful to drive the remote photoplethysmography (rPPG) utility beyond its current applications. The present work aims to create a simple analytical framework that links skin color with blood oxygenation and perfusion. The model consists of two parts. First, the model's core connects changes in tissue chromophore concentrations with changes in tissue reflectance. In the second step, the tissue reflectance is convoluted with the response curves of a sensor (tristimulus response in the case of the human eye) and the light source's spectrum. The model allows linking changes in blood oxygenation and perfusion with changes in skin color. The model can be helpful for the interpretation of the amplitudes of various components of the rPPG signal.
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