Conversion of multilevel digital data to binary data

Details Conversion of multilevel digital data to binary data Conversion of multilevel digital data to binary data

1983-05-20

1985-12-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

382 50, 382 53, H04N 140

Patent

active

045624860

ABSTRACT:
A system for converting a multilevel video signal into a binary video signal for use in an image processing machine such as a facsimile machine or digital copier includes a threshold setting circuit which first determines average density levels of a predetermined number of scanning lines and then a digitally weighted average of these average density levels, said digitally weighted average being used as a threshold for the binary conversion processing.

REFERENCES:
patent: 4468703 (1984-08-01), Fujiwara et al.
E. H. Schroeder, Threshold Detector, I.B.M. Technical Disclosure Bulletin, vol. 24, No. 4, 9/81.

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