Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-04-15
1979-04-03
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358108, 3401463Q, H04N 718
Patent
active
041480627
ABSTRACT:
A television-based alarm system comprises a plurality of television cameras connected in time-multiplex mode to a set of discriminators. The discriminators are sequentially connected to receive the video signals from the cameras, the arrangement being such that each discriminator receives the video signal from a predetermined camera. Each discriminator is adapted to generate a pulse upon the occurrence of a predetermined characteristic in the picture content of the video signal corresponding to a particular type of event in the field of view of the camera. The discriminating functions of the discriminators differ so that different types of event may be detected by the various cameras. The pulses generated by the discriminator at any time connected to a camera are logically combined with a masking signal which defines a portion or portions of the field of view from which pulses are not required. A plurality of different masking signals are provided and these are provided in sequence to the discriminators. The pulses may then be logically coupled with a second masking signal. In such case the first masking signal may define a series of horizontal or vertical stripes for detecting movement in a particular direction and the second masking signal may restrict the field of view to a part only of the total possible field of view. After the logical coupling the remaining pulses are evaluated according to a predetermined criterion to generate an alarm signal.
REFERENCES:
patent: 3603729 (1971-09-01), Sperber
patent: 3743768 (1973-07-01), Copland
patent: 3781468 (1973-12-01), Chomet et al.
patent: 3825676 (1974-07-01), Ramsden, Jr.
Coles Edward L.
Griffin Robert L.
Robert & Bosch GmbH
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