Video alarm systems
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United States of America Patent
Stats
-
Apr 15, 1980
Grant Date -
N/A
app pub date -
Apr 3, 1978
filing date -
Apr 4, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention concerns a video alarm system for discriminating a video signal for detecting a movement or change in a scene under supervision by a television camera, the television picture being sub-divided into a plurality of areas which are individually evaluated to determine whether or not an alarm is to be raised. In order to avoid the release of a spurious alarm by fluctuations in basic brightness of the scene, caused for example by intermittent cloud cover, a particular area of the picture is investigated for variations in average brightness. If a brightness change greater than a predetermined threshold is detected in the selected area, any alarm signal initiated by the alarm system is suppressed.
First Claim
Family
International Classification(s)
Cited Art Landscape
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