Video alarm systems

Details Video alarm systems Video alarm systems

1978-03-10

1979-07-17

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

340541, 340551, H04N 718

Patent

active

041617509

ABSTRACT:
In a video alarm system with digital evaluation the analog video signal generated by a television camera is converted into a binary signal by comparison with a threshold-value signal in an amplitude discriminator, and the binary signal is then evaluated, for example by summing. The threshold-value signal is in the form of an alternating voltage which sweeps over the black-to-white amplitude range of the picture information containing portion of the video signal a plurality of times during each line period. Compensation is provided for fluctuations of overall brightness in the scene from which the video signal is derived by inverting the binary signal to be evaluated during alternate sections of each line period.

REFERENCES:
patent: 3781468 (1973-12-01), Chomet et al.
patent: 4090221 (1978-05-01), Connor

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