System and method for accelerated data recompression

Details System and method for accelerated data recompression System and method for accelerated data recompression

1996-12-20

2000-02-01

Coles, Edward L.

Facsimile and static presentation processing

Static presentation processing

Memory

358 116, 358 111, 358 11, 358 115, 358 117, 358 113, 358 118, 358404, 358444, B41B 1500, H04N 100, H04N 140

Patent

active

060209755

ABSTRACT:
A system for accelerated data recompression in which uncompressed data need not be swapped in and out of memory at each iterative data recompression step. The data recompression system includes a main memory for storing image data, and a decompression device which receives compressed data from the main memory and decompresses it to produce discrete blocks of uncompressed data. An intermediate compression buffer, separate from the main memory and connected to the decompression device, is used by the decompression device to store one block of uncompressed data at a time. The blocks of data are received one at a time by a data compression device taking input directly from the intermediate compression buffer. There the uncompressed data blocks are compressed and stored back to the main memory one block at a time. Thus, an entire compressed image stored in main memory is decompressed and recompressed one block at a time, and uncompressed data need not be swapped in and out of main memory. As a result, overall data recompression speed is greatly improved.

REFERENCES:
patent: 5544286 (1996-08-01), Laney
patent: 5544290 (1996-08-01), Gentile
patent: 5638498 (1997-06-01), Tyler et al.
patent: 5706413 (1998-01-01), Takabayashi et al.
patent: 5838334 (1998-11-01), Dye

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