Data compression chip for electrographic printers Electrographic printing (EP) is the latest printing technology. Its advantages include, (1) distributed printing (e.g. contents is transferred by Internet and actually printed at the nearest place to clients, decreasing transportation cost), (2) on-demand printing (e.g. out-of-print does not exist), and (3) short-run (e.g. one or two days for printing, while off-set printing needs 10 to 14 days). In addition EP treats large volume of data with high precision. Thus, EP requires (1) high data compression rate, (2) loss-less data compression, and (3) high extension spped in printing. These requirement can not be fulfilled by current international standards in data compression (e.g. JBIG). The EHW-based data compression attains twice better compression reta than JBIG (note this is in loss-less mode!).

You can get the papers about this project from our download site:
Japanese: No.008, No.011
English: No.032, No.034, No.036

Fig.1: Electrophotographic Printer.


Fig.2: Architecture of data compression EHW.


Fig.3: Data compression EHW chip.

If you have comments or questions, please send email to Hidenori Sakanashi.

Last Update: 6/4/99