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

1984-09-18

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 526

Patent

active

044727437

ABSTRACT:
A diaphragm control for a video camera is disclosed and controls the camera diaphragm in response to the camera video output. The video output signal is inverted by an inverting amplifier and is selectively voltage doubled to vary the weight of the light portions of the signal with respect to its dark portions. The selectively voltage doubled signal is averaged to a D.C. voltage and is compared to a reference exposure voltage. The reference exposure voltage is automatically varied to compensate for level variations in the voltage doubled signal caused by the selective doubling.

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

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