Dark current eliminator useful for auto-iris controller

Details Dark current eliminator useful for auto-iris controller Dark current eliminator useful for auto-iris controller

1984-10-31

1986-07-08

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358221, 358213, H04N 5238, H04N 5228

Patent

active

045996547

ABSTRACT:
Commercially available automatic iris lens assemblies typically respond to the peak-to-peak level of the video signal supplied from the imager, for controlling the amount of light imaged thereon. For preventing the dark current component of the video signal from undesirably reducing the dynamic control range of the iris control, the video signal is modified before it is applied to the automatic iris lens assembly. The modification comprises shifting the average value of the video signal to a given level approximating the average level of a normal video signal and then setting the levels of the blanking portions to the given level.

REFERENCES:
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patent: 4327378 (1982-04-01), Tanaka et al.
patent: 4369466 (1983-01-01), Matsuzaki et al.
patent: 4399466 (1983-08-01), Stephenson
patent: 4516172 (1985-05-01), Miyata et al.
Motorola Service Manual entitled "Intensified Low Light Level Cameras" Models: V14006A and V14007A published 8/82.

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