| http://www.w3.org/ns/prov#value | - 20120002020BILLBOARD DISPLAY SYSTEM AND METHOD - A billboard display method includes: capturing images of a scene near the screen by a number of time-of-flight (TOF) cameras, building three dimension (3D) models of the scene according to the images and the data about distances between points in the scene and the TOF cameras; checking the 3D models to determine whether there is a person nearby the
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