An interactive input system comprises an illumination source projecting light onto such that a shadow is cast onto an interactive surface when an object is positioned between the illumination source and the interactive surface, at least one imaging device capturing images of a three-dimensional (3D) space in front of the interactive surface, and processing structure processing captured images to detect the shadow and object therein, and determine therefrom whether a gesture was performed within or beyond a threshold distance from the interactive surface and execute a command associated with the gesture.
GESTURE RECOGNITION BY SHADOW PROCESSING