A hand-manipulated prop is picked-up via a single video camera, and the camera image is analyzed to isolate the part of the image pertaining to the object for mapping the position and orientation of the object into a three-dimensional space, wherein the three-dimensional description of the object is...http://www.google.com/patents/US6795068?utm_source=gb-gplus-sharePatent US6795068 - Prop input device and method for mapping an object from a two-dimensional camera image to a three-dimensional space for controlling action in a game program
