Patent ID: 7432917
Filing Date: 2008-10-07
Classification: G06F

Abstract:
1. A method for calibrating and compensating at least one error in an interactive display system that includes a projector for projecting images on a display surface as defined by a software program, a light source for illuminating an object on the display surface with light, and a vision sensing system having an imaging sensor for receiving light reflected back from the display surface by an object in contact with the display surface, said method including the steps of: (a) receiving a signal from the imaging sensor, said signal varying in response to an intensity of the light reflected from an object in contact with the display surface; (b) automatically compensating the signal received from the imaging sensor for the at least one error on the image produced by the imaging sensor, yielding a compensated signal; (c) aligning at least one of the vision sensing system and the projector relative to the other and to the display surface; and (d) employing the compensated signal as an input to the software program that defines the images projected on the display surface, so that the software program accurately detects a location of an object on the display surface relative to the images projected on the display surface by the projector.