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Closed-circuit television (CCTV), after that 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 announce television in that the signal is not openly transmitted, though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require further security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in separate from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas as regards the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in do its stuff enforcement, in the same way as cameras located upon a police officer's chest or head. Video surveillance has generated significant debate practically balancing its use behind individuals' right to privacy even in the same way as in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example like the setting is not conventional for humans. CCTV systems may produce an effect continuously or by yourself as required to monitor a particular event. A more innovative form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of character and bill options and further features (such as movement detection and email alerts). More recently, decentralized IP cameras, perhaps equipped behind megapixel sensors, maintain recording directly to network-attached storage devices, or internal flash for agreed stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. approximately 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 increase in declare surveillance, a substantial rise in the methods of avant-garde social monitoring and control, and a host of crime prevention dealings throughout the world.

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