The rendering of skin colours plays a significant role for preferred colour reproduction. To study preferred skin colour enhancement, we evaluated various skin colour boundary models for skin detection, face tracking, and colour enhancement, and selected an elliptical modelling approach to model the skin colour boundary for its accuracy, efficiency, and convenience for skin colour enhancement. An image database was developed to train ellipse models and ellipsoid models. The skin boundary model was applied to guide psychophysical experiment to determine a preference skin colour centre for preferred colour enhancement.
Huanzhao Zeng, Ronnier Luo, "Modelling Skin Colours for Preferred Colour Reproduction" in Proc. IS&T 17th Color and Imaging Conf., 2009, pp 175 - 180, https://doi.org/10.2352/CIC.2009.17.1.art00033