Peak-response controller for average-responding automatic iris

Details Peak-response controller for average-responding automatic iris Peak-response controller for average-responding automatic iris

1979-11-09

1981-05-19

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 514

Patent

active

042688663

ABSTRACT:
A commercial automatic-iris lens assembly responds to the average value of the video signals applied to its control input. For use in industrial and surveillance camera applications, the video signals applied to the control input of the automatic iris from an image sensor are passed through a controllable-gain amplifier. The gain of the amplifier is controlled in response to the peak value of the video signals produced by the image sensor to provide an effective peak responding iris.

REFERENCES:
patent: 2885471 (1979-05-01), King
patent: 3555181 (1971-01-01), Thommem
patent: 3691302 (1972-09-01), Gaebele et al.
patent: 3767853 (1973-10-01), Bendell et al.
patent: 4050085 (1977-09-01), Prince et al.

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