Method and apparatus for reproducing half-tone images

Details Method and apparatus for reproducing half-tone images Method and apparatus for reproducing half-tone images

1992-09-25

1995-02-07

Ip, Paul

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, 358466, H04N 140

Patent

active

053879872

ABSTRACT:
A method and apparatus for reproducing half-tone images by converting continuous-tone image data into a multi-valued level density code using a predetermined threshold or thresholds includes adding an output adjusting error to a difference error between image data of a target pixel and a threshold level and diffusing the difference error to which the output adjusting error has been added into pixels surrounding the target pixel.

REFERENCES:
patent: 5045952 (1991-09-01), Eschbach
patent: 5051844 (1991-09-01), Sullivan
patent: 5060284 (1991-10-01), Klees
patent: 5068914 (1991-11-01), Klees
patent: 5070413 (1991-12-01), Sullivan et al.
patent: 5107332 (1992-04-01), Chan
patent: 5130819 (1992-07-01), Ohta
patent: 5130823 (1992-07-01), Bowers
patent: 5140432 (1992-08-01), Chan
patent: 5243445 (1993-09-01), Koike
patent: 5245678 (1993-09-01), Eschbach et al.
patent: 5268774 (1993-12-01), Eschbach
patent: 5278671 (1994-01-01), Takahashi et al.
"4.3: An Adaptive Algorithm for Spatial Grey Scale," Robert Floyd et al., SID Symp., Digest of Papers, p. 36 (1975).

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