Tracking paper

@inproceedings{Yang98Skin-Color,
author = "J. Yang and W. Lu and A. Waibel",
title = "Skin-color Modeling and Adaptation",
booktitle = "Proceedings of ACCV'98",
year = "1998",
volume = "II",
pages = "687-694"
}
Abstract
This paper studies a statistical skin-color model and its adap-tation. It is revealed that (1) human skin colors cluster in a small region in a color space; (2) the variance of a skin color cluster can be reduced by intensity normalization, and (3) under a certain lighting condition, a skin-color distribution can be characterized by a multivariate normal distribution in the normalized color space. We then propose an adaptive model to characterize human skin-color distributions for tracking human faces under different lighting conditions. The parameters of the model are adapted based on the maximum likelihood criterion. The model has been successfully applied to a real-time face tracker and other applications.