Method, apparatus and computer program for image resolution conversion

Abstract

An image resolution converting method, apparatus and computer program converts an input image having varying resolutions to an output image having varying resolutions, using only a single circuit. The method generates a common-coordinate system common to the input image and the output image by relating the number of pixels of the input image to the number of pixels of the output image, calculates an absolute-coordinate of the pixel of the input image and the pixel of the output image, and calculates a pixel value of the output image from the value of a corresponding pixel of the input image using the absolute-coordinates of the output image. A vertical common multiple and horizontal common multiple technique allow integral expression of how far an arbitrary line/dot of the matrix display device is from each of the lines/dots of the input image signals. Using linear interpolation, it is possible to display input image signals having varying resolutions on a matrix display device having a fixed resolution, without lacking pixel information which should be displayed on the matrix display device and further to display the input images scaled up and down on the matrix display device.