When an instruction sequence is divided into a plurality of subsequences and executed by a plurality of painting instruction operators, an effective parallel schedule can be drawn up even if there may exist image elements overlapped one another, thus enabling high-speed painting instruction to be executed....http://www.google.de/patents/US5936634?utm_source=gb-gplus-sharePatent US5936634 - Image forming apparatus and method of forming images by interpreting a page description language with a plurality of processors
