Patent ID: 7626600

Claim:
A projection-type image display system comprising: a sensing section that senses a projection target area and outputs sensing information; a detection section that performs edge detection based on the sensing information and outputs detection information which indicates edge in a sensed image; a projectable area determination section that determines a projectable area which has no obstructions within the projection target area, based on the detection information; a projection area selection section that selects a projection area within the projectable area, based on a user selection or a predetermined reference; an adjustment section that outputs projection size control information to an image projection section, in such a manner that an image is displayed on the projection area, the image projection section projecting the image onto the projection area, based on input image information, wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image onto the projection area in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.