Patent ID: 6932480

Claim:
An image processing system comprising: calibration image information generating means for generating image information which is used to display a calibration image; projection means having a view angle adjusting section which adjusts a view angle and a lens shift section which adjusts an optical axis of a projection lens, the projection means projecting the calibration image onto a rectangular target area, based on the image information; sensing means for sensing a region including the projected calibration image and the target area through a sensing surface to generate sensing information; projection area information generating means for generating projection area information which indicates four corner coordinates of the calibration image on the sensing surface, based on the sensing information; target area information generating means for generating target area information which indicates four corner coordinates of the target area on the sensing surface, based on the sensing information; and projection control means for controlling the view angle adjusting section and the lens shift section, based on the projection area information and the target area information, wherein the projection control means derives a reference line segment vector which indicates a line segment extending from an intersection between diagonal lines of the calibration image on the sensing surface to one vertex of the calibration image, based on the projection area information; wherein the projection control means derives an enlarged line segment vector which indicates a line segment extending from an intersection between diagonal lines of the target area on the sensing surface to an intersection between one side of the target area and a straight line drawn in a direction of the reference line segment vector, the straight line intersects the one side, based on the target area information; wherein the projection control means derives magnification by computing the enlarged line segment vector/the reference line segment vector; wherein the projection control means controls the view angle adjusting section based on the derived magnification; and wherein the projection control means controls the lens shift section based on an intersection between the diagonal lines of the calibration image on the sensing surface and an intersection between the diagonal lines of the target area on the sensing surface after view angle adjustment so that the intersection between the diagonal lines of the calibration image moves to the intersection between the diagonal lines of the target area.