Element generator for dither matrix and a dithering apparatus us

Details Element generator for dither matrix and a dithering apparatus us Element generator for dither matrix and a dithering apparatus us

1994-07-07

1996-02-27

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

326 52, 326104, 348574, 345 55, 327 76, 364757, 364784, 3401462, H03M 112, H04N 140, G09G 320, H03K 1900

Patent

active

054953464

ABSTRACT:
An element generator for a dither matrix comprises a logic device which receives a row address and a column address and performs a logic operation thereon so as to produce a dither element corresponding to the row address and the column address, which is implemented at low cost and has an advantage in that the processing speed is increased. The dithering apparatus comprises a dither-matrix element generator, a comparator, an adder and a selector. The comparator compares the output of the dither-matrix element generator with lower-bit data of the original image data. The adder adds a predetermined number to upper-bit data of the original image data. The selector selects one between the upper-bit data and the adder output, in accordance with the output of the comparator, so as to produce the selected one as the dithered image data. Dithering is thereby performed via hardware, which leads to an increased processing speed.

REFERENCES:
patent: 3739082 (1973-06-01), Lippel
patent: 3925609 (1975-12-01), Ninke
patent: 3959583 (1976-05-01), Judice et al.
patent: 3967052 (1976-06-01), Judice
patent: 3975584 (1976-08-01), Gordon
patent: 4447803 (1984-05-01), Crosby et al.
patent: 4965668 (1990-10-01), Abt et al.
patent: 5166809 (1992-11-01), Surbrook

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