Patent ID: 8126286

Claim:
A method for correcting distortion of an image projected by a projector, comprising: a first detection image data producing step which produces first detection image data containing marker images whose flat surface positions in the projection image can be calculated; a first detection image displaying step which displays a first detection image based on the first detection image data; a first image comparing step which compares the first detection image with the first detection image data; an area selecting step which selects an area having larger distortion of the first detection image than distortion in other area based on the comparison; a second detection image data producing step which increases positioning density of the marker images in the selected area to produce second detection image data; a second detection image displaying step which displays a second detection image based on the second detection image data; a second image comparing step which compares the second detection image with the second detection image data; and an image correcting step which corrects the projection image.