Patent ID: 8055022

Claim:
A method of determining the absolute position of an object relative to a rectangular frame surrounding a region of interest in the front of a display surface from images captured by at least two digital camera devices, each digital camera device being mounted adjacent a different corner of the frame, said method comprising: capturing images with the digital camera devices, each digital camera device having a field of view that (i) images at least a portion of the display surface, (ii) images at least a portion of the frame, and (iii) extends at least beyond an adjacent peripheral edge of said frame, said digital camera devices being oriented to capture overlapping images of said region of interest, at least one of the digital camera devices having a sensor comprising a plurality of pixels extending in at least one direction; and processing pixel data of images received from each digital camera device using at least one processor to compensate for an angle between the field of view of each digital camera device and at least a portion of the peripheral edge of the frame and to determine the absolute position of the object relative to the frame.