Hebert Luchetti Ribeiro,  Adilson Gonzaga. 

This paper describes hand gesture recognizing technique in real-time using, for hand segmentation, background subtraction through a time-adaptive mixture of Gaussians and skin-color filter. The position and other attributes of the hand, acquired from contour image moments, are tracked per frame to determine the feature vector. The matching of this vector to the hand contour feature vector patterns provides the dynamic and static recognition hand gestures.

http://www.lbd.dcc.ufmg.br/colecoes/wvc/2006/005.pdf

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