Automatic diaphragm control device for a closed circuit televisi

Details Automatic diaphragm control device for a closed circuit televisi Automatic diaphragm control device for a closed circuit televisi

1982-04-02

1984-06-05

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 526

Patent

active

044531850

ABSTRACT:
A diaphragm control for a video camera is disclosed and controls the camera diaphragm in response to the camera video output. The camera video output signal is adjustably weighted to vary the value of the dark portions of signal with respect to the light portions through the use of a selective polarity invertible amplifier which holds the average signal strength constant as the weight of the light and dark portions is varied. The output of the polarity invertible amplifier is averaged and then compared with a reference intensity signal. The output of the comparator is used to control the camera diaphragm.

REFERENCES:
patent: 4050085 (1977-09-01), Prince et al.

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