Patent ID: 8284216

Claim:
A projection-type image display system comprising: an image projection section that, based on calibration image signals, projects a black calibration image and a white calibration image sequentially onto a projection target area, or that projects nothing and the white calibration image sequentially, the white calibration image being projected at a maximum image size; a sensing section that: outputs black sensing information by sensing the projection target area when nothing is projected or sensing the black calibration image; and outputs white sensing information by sensing the white calibration image; a detection section that performs edge detection based on the black sensing information and outputs detection information that indicates edges in the sensed projection region; a projectable area determination section that determines a projectable area 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 adjusts the image projection section so that the image projection section projects an image onto the projection area.