Patent ID: 7027041
Filing Date: 2006-04-11
Classification: G06F,G09B

Abstract:
1. A presentation system comprising: a screen device that displays an image; an indication mark for setting a virtual screen near a user and for being used by the user to operate a point on the virtual screen; a photographing device that photographs the virtual screen and the indication mark; an arithmetic operation device that calculates coordinates of the indication mark on the virtual screen based on a photographed image of the virtual screen and the indication mark photographed by the photographing device; and a projecting device for projecting a point image onto the screen device, based on the calculated coordinates of the indication mark on the virtual screen, which are calculated by the arithmetic operation device; wherein when the user sets two arbitrary reference points by using the indication mark, the photographing device photographs the two reference points and the arithmetic operation device generates coordinates of the virtual screen from a photographed image of the two reference points photographed by the photographing device, so that the virtual screen is set to have a rectangular area based on the two arbitrary reference points.