Patent ID: 7195357

Claim:
An image processing apparatus for correcting an image that is projected from a projector at a tilt angle in the vertical direction with respect to the normal projection direction of the projector, comprising: a vertical reduction section for performing reduction correction in the vertical direction with respect to image data of said image; and a horizontal reduction section for performing reduction correction in the horizontal direction with respect to image data on which reduction correction has been performed by said vertical reduction section, wherein said image data comprise pixel data of pixels arranged in a matrix; when said tilt angle is angle β, said vertical reduction section computes the number of corrected vertical pixels Vn with respect to the number of pixels Nv in the vertical direction existing from projection angle 0° to α as follows Vn=Nv ×tan α/(cos β×tan(α+β)−sin β) performs vertical correction processing by reducing said number of pixels Nv to said number of corrected vertical pixels Vn.