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Surveillance system using TV cameras - with comparison of successive video images raising alarm when given value is exceeded for given duration
Surveillance system using TV cameras - with comparison of successive video images raising alarm when given value is exceeded for given duration
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机译:使用电视摄像机的监视系统-比较连续的视频图像,在给定的持续时间内超过给定值时发出警报
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摘要
The surveillance system, for detecting any movement or variation in a surveillance zone, employs a number of tv cameras, the image supplied by each being stored for comparison with a subsequent image from the same camera. An alarm signal is supplied when the difference between the compared signals exceeds a given pulse for a given duration. The cameras are connected in time multiplex via an electronic switch to a common store and via a second electronic switch to a comparator supplied with the store contents via a further switch. The second switch is controlled via a programmed control circuit synchronised with the store.
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