Television-based alarm system

Details Television-based alarm system Television-based alarm system

1977-04-15

1979-07-10

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358108, H04N 718

Patent

active

041609980

ABSTRACT:
The invention concerns an alarm system for detecting a movement or change in the field of view supervised by a television camera. A discriminator, for example an edge discriminator or an amplitude discriminator, produces a signal upon the occurrence of a predetermined characteristic in the picture content of the video signal from the camera. The number of such signals occurring during each of a plurality of successive television fields is compared with a reference value which is periodically updated. The reference value is derived by counting the total number of signals occurring during a plurality of field periods preceding that for which the comparison is effected and dividing the total by the number of fields thereby generating an arithmetical mean value. Each comparison generates a difference signal which is further evaluated to determine whether a relevant variation in the field of view of the camera has occurred, whereupon an alarm is released.

REFERENCES:
patent: 3825676 (1974-07-01), Ramsden

Affiliated with

Also associated with

Rating

Television-based alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Television-based alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television-based alarm system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-741037