A new interaction/input device for an augmented reality system is provided. In an augmented reality system using infrared video-based tracking, the interaction/input device is employed by placing markers, e.g., small disks, at a predetermined location in a scene viewed by a user which are augmented to...http://www.google.com/patents/US7215322?utm_source=gb-gplus-sharePatent US7215322 - Input devices for augmented reality applications
