Image processing system capable of selecting from among a plural

Details Image processing system capable of selecting from among a plural Image processing system capable of selecting from among a plural

1995-02-14

1997-05-06

Mancuso, Joseph

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382252, 382266, H04N 140

Patent

active

056276591

ABSTRACT:
In an image processing system containing a binary-coding apparatus for transforming multigradation image data into bigradation image data formed of only two gradations (e.g. black and white), the binary-coding apparatus includes a binary-coding section for binary-coding a target pixel into the first gradation value or the second gradation value; an error diffusion section for diffusing a binary-coding error caused during the process of binary-coding the target pixel, to its adjoining pixels not yet binary-coded; and an error diffusion matrix select section for selecting one of at least two error diffusion matrices used by the error diffusion section. The selection between matrices is rendered in accordance with an original image gradation data value of the target pixel and a binary-coding result of the target pixel. When the binary-coding result of the target pixel is the first gradation value, the error diffusion matrix select section selects an error diffusion matrix of large size when an original image gradation data value differs greatly from the first gradation value and approximates the second gradation value, so that the binary-coding error is diffused to a broader area.

REFERENCES:
patent: 4876610 (1989-10-01), Ohsawa et al.
patent: 5014333 (1991-05-01), Miller et al.
patent: 5051844 (1991-09-01), Sullivan
patent: 5070413 (1991-12-01), Sullivan et al.
patent: 5317653 (1994-05-01), Eschbach et al.
patent: 5339171 (1994-08-01), Fujisawa et al.

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