Apparatus for and method of compressing form data

摘要

A form data compressing method in which form data are stored in memory for every raster, the raster data pattern of each raster is divided into a plurality of units each having a plurality of bits, the unit data patterns of these units are subjected to comparison to perform the compression in unit order direction, and according to the compression data obtained by the compression in unit order direction the compression in raster order direction is carried out.