VisualMouse translates user's head motion into the motion of the cursor
on the screen, by processing the image from a PC video-conference
camera. This is what VisualMouse does as a pointing device. VisualMouse
can also function as a gesture recognition device - mouse clicks and
user-defined commands are activated by head gestures. For example, the
user can define 4 commands, and then use head gestures to give the
commands, freeing the hands for other things. The gestures are the turns
of the head: left-and-back,right-and-back, up-and-back, down-and-back."
http://www.download.com/VisualMouse/...-10154762.html
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