Method, medium, and system effectively compressing and/or restoring binary images

摘要

A method, medium, and system effectively compressing and/or restoring binary images. By compressing pixel values making up a 2x2 block in an input image, using representative values representing the pixel values and a pattern of the pixel values represented by the representative values, it is possible to effectively compress and/or restore binary images having little similarities between pixel values. In addition, by extracting compressed values and a pattern of pixel values making up a 2x2 block in an image, from compressed data of the 2x2 block, and restoring pixel values using the compressed values and the pattern, it is possible to effectively restore binary images.