Video alarm systems

Details Video alarm systems Video alarm systems

1978-04-03

1980-04-15

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358108, 340541, H04H 718

Patent

active

041986539

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.

REFERENCES:
patent: 3988533 (1976-10-01), Mick et al.

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