Image data compression-expansion circuit

Details Image data compression-expansion circuit Image data compression-expansion circuit

1994-03-02

1998-06-09

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

358433, 382232, 348420, H04N 141, H04N 1415

Patent

active

057643733

ABSTRACT:
A line buffer device temporarily stores a predetermined area of original image data which are divided into small blocks, each having a small area, so as to encode the image data for each block into data having a fixed length by a compression processor. The line buffer device is composed of a first-stage line buffer group and a second-stage line buffer group. The number of line buffers in the first-stage line buffer group is smaller by one than the number of lines constituting one block and the number of line buffers in the second-stage line buffer group is the same as the number of lines constituting one block. Encoding processing time is shortened and the circuit structure is simplified.

REFERENCES:
patent: 4788598 (1988-11-01), Ochi et al.
Oka & Onishi, "Implementation of Image Compression for Printers" Consumer Products Laboratory, Mitsubishi Electric, Japan.

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