Automatic exposure and gain control for low light level televisi

Details Automatic exposure and gain control for low light level televisi Automatic exposure and gain control for low light level televisi

1994-02-17

1995-09-26

Yusko, Donald J.

Television

Camera, system and detail

Low light level

348229, H04N 538

Patent

active

054537827

ABSTRACT:
A pick-up tube of a camera device is optically coupled to an image intensifier tube. An exposure control circuit is provided which monitors the charge supplied to the phosphor screen of an image intensifier device and, thus, to the photodetector of the pickup tube, and which varies the exposure time in accordance with the level of scene illumination and the charge storage capability of the photodetector. The exposure control system also adjusts the gain of the image intensifier in accordance with the scene illumination prior to readout of the photodetector in order to optimize the signal to noise ratio.

REFERENCES:
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patent: 4495520 (1985-01-01), Kravitz et al.
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patent: 4888644 (1989-12-01), Wilson
patent: 5134489 (1992-07-01), Sauer
patent: 5198657 (1993-03-01), Trost et al.
patent: 5218194 (1993-06-01), Gabi et al.

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