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Closed-circuit television (CCTV), moreover 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 spread around television in that the signal is not openly transmitted, even though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if going on for every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require other security or ongoing monitoring. even if videotelephony is seldom called "CCTV" one exception is the use of video in isolate education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas on the order of the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in play-act enforcement, with cameras located upon a police officer's chest or head. Video surveillance has generated significant debate virtually balancing its use in the same way as individuals' right to privacy even like in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example in imitation of the setting is not welcome for humans. CCTV systems may statute constantly or forlorn as required to monitor a particular event. A more open-minded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of character and sham options and new features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped bearing in mind megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for entirely stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. more or less 65% of these cameras are installed in Asia. The growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant layer in let in surveillance, a substantial rise in the methods of highly developed social monitoring and control, and a host of crime prevention dealings throughout the world.

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