Patent ID: 7466871

Claim:
An edge generation method that generates edge information which expresses an area of an edge of an enlarged image resulting from enlarging an unenlarged image on the basis of image data that represents the unenlarged image with gradation data of each pixel, the method comprising: acquiring a position of an edge in correspondence with a position of each pixel of the enlarged image on the basis of the image data; determining a direction of an intended edge according to the gradation data of plural pixels within a predetermined region including a position of the intended edge which determines the direction among the gradation data of each pixel on the enlarged image; correcting the position of the intended edge to a position that brings a direction connecting a position of the intended edge and a position of an edge that is in proximity to the intended edge closer to the determined direction of the intended edge in the enlarged image; and generating the edge information representative of the area of the edge of the enlarged image in correspondence with the position of each pixel of the enlarged image.