Image signal processing circuit

Details Image signal processing circuit Image signal processing circuit

1982-03-11

1984-05-01

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

307351, 307358, 328151, 358263, 358282, 358284, 382 53, H04N 140

Patent

active

044464860

ABSTRACT:
An image signal processing circuit for use in a copying device or the like includes maximum/minimum detection and hold circuits which together output signals approximating an envelope of the white and black levels of the image signal. The envelope thus formed is divided at a predetermined proportion and the divided signal is used as a threshold value for conversion of the image signal into binary form.

REFERENCES:
patent: 3723649 (1973-03-01), Pitegoff et al.
patent: 3869698 (1975-03-01), Trost et al.

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