Patent ID: 7222971

Claim:
A projector apparatus comprising: a projection unit which projects an image corresponding to an input image signal; an instruction unit which issues an instruction for performing keystone correction; a distance survey unit which surveys a distance between the projector apparatus and each of a plurality of positions on the image projected by the projection unit, in accordance with an instruction from the instruction unit; a keystone correction unit which performs keystone correction of the image projected by the projection unit, such that the image becomes a rectangle having an appropriate aspect ratio based on the distances obtained by the distance survey unit; and a focus control unit which controls a lens of the projection unit so as to bring the keystone-corrected image corrected by the keystone correction unit into focus at a center position of the keystone-corrected image; wherein the focus control unit brings the keystone-corrected image into focus based on a distance between the projector apparatus and the center position of the keystone-corrected image, and wherein the distance to the center position of the keystone-corrected image is obtained by the distance survey unit by re-surveying.