Simon Fraser University Computational Vision Lab Lilong Shi, Brian Funt and Tim Lee. Studies in Appearance of Skin. Overview. Studies of factors affecting skin colour Simple and linear model of skin Modelling Skin appearance under lights Applications:
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Skin tone correction
Original Source Signals
s × A = v
(left) 33 skin spectrum after normalization; (right) two independent basis spectrum – the melanin and hemoglobin, and the spectrum of chromophores other than melanin and hemoglobin pigments.
Given a pixel from skin, compute by projecting log(R,G,B) onto
Possible skin colours lie within plane
Input Image 
- Inverse melanin concentration
- Inverse hemoglobin concentration
16 different illumination + camera settings