Patent ID: 7909470

Claim:
An image projection method using a projector, which forms an image by a planar image formation panel and projects light from said planar image formation panel forming the image to an external projection plane, thereby projecting a projection image to said external projection plane, the method comprising: a step for setting a projection range where the projection image can be projected on said projection plane; a step for obtaining a method for mutual conversion between a panel coordinate system that defines a position on said image formation panel and a projection plane coordinate system that defines a position on said projection plane, based on coordinates of a range on said image formation panel corresponding to said projection range by projection and coordinates of said projection range in said projection plane coordinate system; a step for setting a displayable region where an original image for the projection image can be formed, on said image formation panel, according to an aspect ratio of the projection image to be projected; a step for calculating coordinates of said set up displayable region in said panel coordinate system; a step for converting said coordinates of said displayable region in said panel coordinate system to coordinates of a region corresponding to said displayable region in said projection plane coordinate system; a step for setting a rectangular area with a same aspect ratio as the projection image to be projected in a region corresponding to said displayable region and a portion included in said projection range in said projection plane coordinate system; a step for converting coordinates of said rectangular area in said projection plane coordinate system to coordinates of a range corresponding to said rectangular area in said panel coordinate system; a step for forming said original image for the projection image in a range corresponding to said rectangular area on said image formation panel represented by the converted coordinates; and a step for projecting light from said image formation panel forming said image to said projection plane.