Christopher Fagiani Margrit Betke James Gips Evaluation of Tracking Methods for Human-Computer Interaction. 121-126 2002 conf/wacv/2002 WACV http://csdl.computer.org/comp/proceedings/wacv/2002/1858/00/18580121abs.htm db/conf/wacv/wacv2002.html#FagianiBG02