Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1997-06-17
1998-12-22
Pan, Daniel H.
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
39580029, 3958003, 39580038, 395821, 395842, 395848, 711109, 711111, 711115, 711114, G06F 900
Patent
active
058527427
ABSTRACT:
A print data processing pipeline for use in a color electrophotographic printer optimizes print quality and minimizes memory usage by separately processing lossy and lossless print data. Lossy print data may include print data for images and lossless print data may include print data for text, line art, and graphics. Partitioning print data into lossy and lossless components allows application of the print data compression operations optimized for each type of print data. High compression ratios can be achieved on lossy print data by applying visually lossless compression operations designed for the lossy print data. In addition, high compression ratios can be achieved on the lossless print data by applying lossless compression operations designed for the lossless print data. A merge unit combines the lossy and lossless print data streams after decompression to reconstruct the original image. Placement of the color space conversion operation and the halftone operation relative to the merge operation, further optimizes the print quality while minimizing memory usage. The print data processing pipeline includes a direct memory access controller which has the capability to allow print data to be selectively directed to the lossy or lossless compressor/decompressor, the color space converter, or the merge unit. Feedback paths within the print data processing pipeline allow the results of the various operations performed to be returned to the direct memory access controller for further processing or storage in system memory. Bypass paths in the color space converter and halftone unit allow print data to be selectively directed around these operations. These capabilities allow configuration of the print data processing pipeline to perform a multitude of permutations of print data processing operations optimized for the print data.
REFERENCES:
patent: 4850027 (1989-07-01), Kimmel
patent: 4989138 (1991-01-01), Radochoonski
patent: 5511152 (1996-04-01), Lai et al.
patent: 5729668 (1998-03-01), Claflin et al.
patent: 5784636 (1998-07-01), Rupp
Clouthier Scott C.
Heins Douglas
Hoffmann Brian E.
Nottingham James R.
Vondran, Jr. Gary L.
Hewlett--Packard Company
Nguyen Dzung C.
Pan Daniel H.
Wisdom Gregg W.
LandOfFree
Configurable data processing pipeline does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Configurable data processing pipeline, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Configurable data processing pipeline will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2055222