Patent ID: 7978174

Claim:
A method of tracking a position of an input device for an interactive electronic system comprising: displaying an electronic marker on a display screen; capturing a calibration image of said electronic marker using an image sensor of the input device positioned at a calibration position with respect to said display screen; assigning calibration x, y and z coordinates based on an appearance of said electronic marker in said calibration image to establish said calibration position of said input device, including using a separation of features of said electronic marker in said calibration image to determine the distance between said input device and said display screen to assign said calibration z coordinate; displaying a first series of program frames on a display screen without displaying said electronic marker, wherein said first series of frames depict a view of a program from said calibration position; displaying said electronic marker on said display screen after said displaying of said first series of program frames on said display screen; capturing a first image of said electronic marker using said image sensor of said input device positioned at a first relative position with respect to said calibration position; calculating said first relative position of said input device comprising x, y and z coordinates using said first image of said electronic marker; and displaying a second series of program frames on said display screen without displaying said electronic marker, wherein said second series of frames depict a view of said program from said first relative position.