Patent ID: 8330730

Claim:
A method of calibrating a touch system comprising a matte/chroma-key blue-screen composite imaging processing system and touch input device having an active touch area which comprises: positioning the touch input device on a matte/chroma-key backdrop such that the active touch area of the touch input device is in a known location with reference to an imaging camera and composite image field of view, illuminating a fiducial perimeter of the active touch area by a synchronized pulsed light emission of four laser sources for a time duration of less than one frame exposure time long to obtain laser flash fiducial images, selecting one image frame containing a laser flash fiducial image of the touch system active touch area fiducial perimeter, subjecting the laser flash fiducial image to recognition software analysis to derive a position of the illuminated fiducial perimeter of the active touch area, retrieving appropriate calibration template files from memory, and comparing the calibration template files to a size and position of the active touch area laser flash fiducial image selecting and loading the calibration template file that matches the laser flash fiducial image, and completing the calibration.