Data transition enhancement

Details Data transition enhancement Data transition enhancement

1981-12-07

1984-08-28

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

328114, 358166, H04N 140, H04N 514

Patent

active

044687052

ABSTRACT:
A data enhancement circuit for a facsimile receiver is provided. The circuit includes positive and negative slope detectors as well as a signal threshold detector. Incoming signals above the signal threshold and having a positive slope are considered black. Incoming signals above the signal threshold but with a negative slope are considered white. Incoming signals below the threshold are always considered white. Incoming signals above the signal threshold and with a negative slope having a slope magnitude less than a predetermined slope magnitude are considered gray. The circuit of the present invention reacts to high speed data and provides enhancement for images in a gray scale.

REFERENCES:
patent: 3223778 (1965-12-01), Stone et al.
patent: 3413412 (1968-11-01), Townsend
patent: 3471638 (1969-10-01), De Groat
patent: 3472958 (1969-10-01), Estock
patent: 3723649 (1973-03-01), Pitegoff et al.
patent: 3868477 (1975-02-01), Katzman
patent: 3947699 (1976-03-01), Whitmer
patent: 4199728 (1980-04-01), Carpenter
patent: 4315285 (1982-02-01), Sommer et al.

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