Patent ID: 7180510

Claim:
A pointed position detection device which detects a position irradiated by a pointing light of a pointing device for specifying a position on a screen by the pointing light, said detection device comprising; a timing extraction unit which extracts timings of projection periods during which respective images of each of a plurality of pre-designated color components included in a projected image are projected; a photographing unit which photographs said screen to obtain a first image during a first projection period in which a projection image including only a color component different in color from the pointing light is projected, and which photographs said screen to obtain a second image during a second projection period in which a projection image including a color component of a same color as the pointing light is projected, based on the timings extracted by said timing extraction unit; and a position detection unit which detects the position irradiated by the pointing light from the first and second images photographed by said photographing unit.