Noninvasive DC restoration to upgrade AC coupled systems

Details Noninvasive DC restoration to upgrade AC coupled systems Noninvasive DC restoration to upgrade AC coupled systems

1985-09-09

1987-12-15

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 516

Patent

active

047136944

ABSTRACT:
A DC restoration circuit for a video imaging system having a detector array and AC coupled amplifiers is disclosed. The DC restoration circuit includes circuitry (15) for providing a difference signal indicative of the difference between a first scan line video signal and a second scan line video signal; a histogram circuit (20) responsive to the difference signal for generating histogram data indicative of the number of occurrences of difference values of the difference signal; a dominant shift detector circuit (30) responsive to the histogram data for determining a representative difference signal value and for providing a video correction signal which is based on the representative difference signal value; and correction circuitry (13, 17) responsive to the second scan line video signal and the video correction signal for providing a corrected video signal.

REFERENCES:
patent: 4214271 (1980-07-01), Jones
patent: 4318129 (1982-03-01), Zwirn
patent: 4400729 (1983-08-01), Jones
patent: 4445138 (1984-04-01), Zwirn
patent: 4575760 (1986-03-01), Nakagaki

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