Apparatus and method for compressing and restoring binary image

Details Apparatus and method for compressing and restoring binary image Apparatus and method for compressing and restoring binary image

1996-06-26

1998-09-01

Boudreau, Leo

Image analysis

Image compression or coding

382166, G06K 900

Patent

active

058022090

ABSTRACT:
When an N-times density binary image having N+1 tones is compressed, only the tone of each pixel is converted into a compressed code. The compressed code has a number of bits necessary and sufficient to distinguish between the tones. When a triple-density image having 4 tones is compressed, for example, the tone of each pixel is converted into a 2-bit compressed code. When the original N-times density is restored from the compressed code, there is formed a dot pattern in which the number of dots corresponding to the tone, as represented by the compressed code of each pixel, are situated closer to the darker one of the two adjoining pixels.

REFERENCES:
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patent: 4150400 (1979-04-01), Wong
patent: 4596993 (1986-06-01), Erlichman
patent: 4916545 (1990-04-01), Granger
patent: 4926251 (1990-05-01), Sekizawa et al.
patent: 5535013 (1996-07-01), Murata
patent: 5625755 (1997-04-01), Shu

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