Halftone implementation apparatus

Details Halftone implementation apparatus Halftone implementation apparatus

1979-02-02

1980-07-22

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 140

Patent

active

042142776

ABSTRACT:
A scanned raster is divided into halftone cells that are, for example, four by four picture elements (pixels) in size, i.e., it takes sixteen picture elements to make one halftone cell. The tone is determined by summing a different and predetermined threshold value for each of the picture elements that comprise a halftone cell. Each of these signals is then sliced at a predetermined value; if the sum of the threshold and the video value is higher than the slicing level, the picture element is transmitted as a "1", and if below the slicing level, it is sent as a "0".

REFERENCES:
patent: 3977007 (1976-08-01), Berry
patent: 4150401 (1979-04-01), Yamamoto

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