Method and apparatus for producing a facsimile gray scale

Details Method and apparatus for producing a facsimile gray scale Method and apparatus for producing a facsimile gray scale

1979-04-20

1981-06-30

Konick, B.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358300, 358283, H04N 122, H04N 130, H04N 140

Patent

active

042765692

ABSTRACT:
A facsimile apparatus receives signals representing black, white and various gradations of gray. The apparatus generates a control signal having a magnitude varying with the gradation of gray from white to black corresponding to the gradations of gray at a remotely located document. A stylus for marking on a copy medium is driven by a stylus drive circuitry which generates a stylus drive signal in response to the control signal which is substantially linearly related to the control signal when the magnitude of the control signal is above and below a threshold and has a step change at the threshold.

REFERENCES:
patent: 3626496 (1971-12-01), McConnell
patent: 3715475 (1973-02-01), Prause et al.
patent: 3739084 (1973-06-01), Heinrich
patent: 3830967 (1974-08-01), Long
patent: 4084196 (1978-04-01), Tisue et al.
Gray Scale to Psuedo Halftone Conversion, Mix., Jr. et al., IBM Technical Disclosure Bulletin, vol. 20, No. 1 Jun. 77.

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