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Closed-circuit television (CCTV), plus known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from make known television in that the signal is not openly transmitted, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if roughly every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring. even though videotelephony is seldom called "CCTV" one exception is the use of video in estrange education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas more or less the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in put on an act enforcement, subsequently cameras located on a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use subsequent to individuals' right to privacy even next in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central rule room, for example subsequently the mood is not okay for humans. CCTV systems may be active forever or unaided as required to monitor a particular event. A more unbiased form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in the manner of a variety of character and pretense options and other features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped in imitation of megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for no question stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. virtually 65% of these cameras are installed in Asia. The enlargement of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant buildup in confess surveillance, a substantial rise in the methods of futuristic social monitoring and control, and a host of crime prevention trial throughout the world.

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