Information compressing method and apparatus

Details Information compressing method and apparatus Information compressing method and apparatus

1986-10-27

1988-02-09

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358141, 358260, 358133, 382 56, H04N 712, H04N 100

Patent

active

047244836

ABSTRACT:
An information compression method and apparatus for information forms in which each from is divided into raster lines. Each raster line is divided into multi-bit units. The information of each unit is compared with that of a preceding unit. Agreement and disagreement codes are stored in a unit memory. The pattern information of disagreeing units only is stored in a pattern memory. Each raster line is then compared with all preceding raster line of this and preceeding forms by means of comparing the respective locations of the unit memory and the pattern memory. When inter-raster agreement is found, the respective locations in a raster memory are given the same address used to access the unit memory and only one set of redundant raster data is stored in the unit and pattern memories.

REFERENCES:
patent: 4193092 (1980-03-01), Stoffel
patent: 4580134 (1986-04-01), Campbell et al.
patent: 4622585 (1986-11-01), Reitsma

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