Dark current correction circuit in two-tube color television cam

Details Dark current correction circuit in two-tube color television cam Dark current correction circuit in two-tube color television cam

1974-12-26

1976-01-20

Libman, George H.

Facsimile and static presentation processing

Static presentation processing

Attribute control

178DIG26, 358 41, H04N 907

Patent

active

039342662

ABSTRACT:
A dark current correction circuit in a two-tube color camera having first and second camera tubes respectively for chrominance signals and luminance signals comprises a circuit for applying to the first camera tube a target voltage in accordance with temperature variation in the image pickup surface thereof, a circuit provided in the picked-up output signal system of the first camera tube and operating to compensate or cancel a dark current component within the picked-up output signal, a circuit for applying to the second camera tube a target voltage in accordance with temperature variation in the image pickup surface thereof, and a circuit for mixing with the picked-up output luminance signal of the second camera tube a horizontal blanking pulse at a level in accordance with the temperature variation in the image pickup surface of that camera tube. The level controlled horizontal blanking pulse, upon being applied to the picked-up output luminance signal, effects correction of a dark current variation component within the luminance signal due to temperature variation in the image pickup surface of the camera tube and for a dark current variation component due to variation of the target voltage.

REFERENCES:
patent: 3558809 (1971-01-01), Aoki
patent: 3814849 (1974-06-01), Bucher et al.

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