| 摘要 |
PROBLEM TO BE SOLVED: To realize a printing process with a small memory capacity by performing a compression or extension on a band unit when printing data is received from host equipment such as a host computer and is printed and outputted to a recording medium such as recording paper. SOLUTION: Printing data described in the PDL received from a host computer is classified into band unit-specific code expressions (S302), raster data is generated for each band, objects in the data is binarized by using a dither matrix prepared for each object, and compressed into a code and stored (S303). This coding is performed by counting objects for every kind of object, and considering the periodicity of a dither matrix for the kind under which most objects fall in generating raster data for a band. When compressed coded data for a band count for a page is generated, an individual band is extended for printing (S304). COPYRIGHT: (C)2005,JPO&NCIPI
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