IMAGE DATA INTERPOLATION METHOD AND DEVICE AND MEDIUM RECORDING IMAGE DATA INTERPOLATION PROGRAM

摘要

An image data interpolation method which eliminates a conventional disadvantage that a jaggy original image is accurately enlarged to provide an unsatisfactory image. When a dot-matrix image is subject to a pixel interpolation, attentional pixels are scanned over the entire image when an image data is input at step 100, whether or not an edge is present in a 45 DEG or 135 DEG direction with reference to an attentional pixel is checked at step 115, the edge is smoothed in a 45 DEG or 135 DEG direction at steps 120 and 125 if the edge is in that angle direction, and then the image is subject to a pixel interpolation independently of the presence of an edge, thereby preventing the occurrence of a jaggy that may otherwise be caused by subjecting an image with an irregular edge to a pixel interpolation without any correction.