Tone processing method for forming a halftone image

Details Tone processing method for forming a halftone image Tone processing method for forming a halftone image

1992-03-09

1995-05-23

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358300, 358457, 358462, H04N 121, H04N 140

Patent

active

054186188

ABSTRACT:
In case of a color original where both graphics and text are present, tone processing is executed by combining a multi-value dither matrix control using a 2.times.2 dot dispersion threshold matrix where 64 non-consecutive threshold values are assigned to each dot of the 2.times.2 matrix. Dots are darkened accordingly if an input value is equal to or greater than a threshold value for a particular quadrant of the 2.times.2 matrix.

REFERENCES:
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patent: 4706077 (1987-11-01), Roberts et al.
patent: 4933777 (1990-06-01), Hsieh et al.
patent: 5077615 (1991-12-01), Tsuji
patent: 5148287 (1992-09-01), Kemmochi et al.
patent: 5177795 (1993-01-01), Tanioka et al.
patent: 5204753 (1993-04-01), Tai

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