Automatic diaphragm control device for use IWT CCTV camera

Details Automatic diaphragm control device for use IWT CCTV camera Automatic diaphragm control device for use IWT CCTV camera

1984-09-17

1985-12-31

Brown, Thomas W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

352141, 354412, H04N 534

Patent

active

045624763

ABSTRACT:
The present invention relates to an automatic diaphragm control device for use with a CCTV camera in which a video signal applied from the CCTV camera is utilized for diaphragm control, and provides an automatic diaphragm control device for use with the CCTV camera, comprising first means for continuous control of the video signal with respect to an absolute brightness of an object to be picked up, second means for continuous control of a proportion of the video signal corresponding to a bright portion in the whole picture when a ratio of the bright portion to a dark portion of this object is relatively high, and third means for stabilization of a control signal, which has been obtained by said first and second means and then rectified, with respect to a source voltage.

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