Method and device for compressing bit-map data

Details Method and device for compressing bit-map data Method and device for compressing bit-map data

1997-02-19

1998-07-07

Vu, Kim Yen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358426, 358433, 358474, 3582611, 382245, 382246, H04N 4415

Patent

active

057777497

ABSTRACT:
The present invention relates to a bit-map compressing method and a bit-map compressing device. The bit-map data compressing method includes a main scanning step for scanning bit-map data in a main scanning direction; a first region separating step for separating a region including black pixels and a region including no black pixels in line unit; a secondary scanning step for scanning in a secondary direction perpendicular to the main scanning direction; a second region separating step for separating a region including black pixels and a region including no black pixels, in column unit; and an encoding step for encoding as an element each region obtained in the first region separating step and the second region separating step. Bit-map can be transferred by effectively performing data compression on simple algorithm, without using special hardware.

REFERENCES:
patent: 4149145 (1979-04-01), Hartke et al.
patent: 4603607 (1986-08-01), Adachi
patent: 4870498 (1989-09-01), Schoon
patent: 4896275 (1990-01-01), Jackson
patent: 4982293 (1991-01-01), Ishii
patent: 5276526 (1994-01-01), Ishikawa
patent: 5335290 (1994-08-01), Cullen et al.

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