Human gestures are detected and/or tracked from a pair of digital video images. The pair of images may be used to provide a set of observation vectors that provide a three dimensional position of a subject's upper body. The likelihood of each observation vector representing an upper body component may...http://www.google.co.uk/patents/US20040151366?utm_source=gb-gplus-sharePatent US20040151366 - Gesture detection from digital video images
