Patent ID: 8305344
Filing Date: 2012-11-06
Classification: G06F,H04N

Abstract:
1. A projector comprising: a photodetector; a first sonic receiver and a second sonic receiver; a distance acquirer; and a distance calculator coupled to said photodetector, said first sonic receiver, said second sonic receiver, and said distance acquirer, wherein said photodetector detects light emitted from an object which is on a projected surface, said first sonic receiver and said second sonic receiver receive a sonic wave emitted from the object, when the object indicates calibration points displayed on the projected surface and calibration of coordinates is performed, said distance acquirer acquires a distance from said projector to the projected surface using the result of said calibration, said distance calculator calculates a position of the object based on outputs of said photodetector, said first sonic receiver, said second sonic receiver, and said distance acquirer; and wherein Cartesian coordinates are generated based on said acquired distance to said object, a vertical component . . . is corrected using a projector-screen distance that was obtained during said calibration, and the Cartesian coordinates following correction are then converted to a panel coordinate system using the corrected coordinates that were obtained during calibration.