Digital image processing device for intermediate tone

Details Digital image processing device for intermediate tone Digital image processing device for intermediate tone

1987-02-05

1988-05-03

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358283, H04N 140

Patent

active

047424001

ABSTRACT:
A digital image processing device for intermediate tone having threshold value tables provided with threshold values different from each other set for each of picture elements in a unit region containing a plurality of picture elements for gradation processing, in which inputted multi-value data are converted into binary data referring to said table and intermediate tone is expressed by adjusting the number of picture elements to be dotted and picture elements not to be dotted within the unit region of the gradation processing.

REFERENCES:
patent: 4549212 (1985-10-01), Bayer
patent: 4553165 (1985-11-01), Bayer
patent: 4623936 (1986-11-01), Urban
patent: 4626902 (1986-12-01), Yamada
patent: 4654721 (1987-03-01), Goertzel

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