Automatic corrector for fixed pattern odd/even video noise

Details Automatic corrector for fixed pattern odd/even video noise Automatic corrector for fixed pattern odd/even video noise

1976-02-12

1977-08-30

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358213, 3401463MA, 250578, 328163, H04N 312, H04N 314

Patent

active

040458164

ABSTRACT:
Fixed pattern odd/even noise in the video signal output from a self-scanned photosensor array is substantially eliminated by integrating the video signal at the cell scan rate, and converting the resultant to a pulse having a width proportional to the charge current generated by a photosensor cell. Even and odd pulses corresponding to alternate sensor cell video signals are produced, and the pulse widths are compared to form a correction signal. A current sink responsive to the correction signal adjusts the output of the integrator during even cell scans to eliminate fixed pattern odd/even noise in the output video signal.
In a specific embodiment, the fixed pattern odd/even noise correction system coacts with an AGC control system and a black reference control system to substantially eliminate fixed pattern odd/even noise and cell clock noise in the output video signal, and to provide an effective system immunity to variations in the parasitic capacitance of the photosensor array.

REFERENCES:
patent: 3790705 (1974-02-01), Kamin
patent: 3856989 (1974-12-01), Weimer
patent: 3904818 (1975-09-01), Kovac
patent: 3937874 (1976-02-01), Carbone
patent: 3949162 (1976-04-01), Malueg

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