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Closed-circuit television (CCTV), with known as video surveillance, is the use of video cameras to transmit a signal to a specific place, upon a limited set of monitors. It differs from puff 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. though on the subject of all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require new security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in push away education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas around the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in play-act enforcement, once cameras located upon a police officer's chest or head. Video surveillance has generated significant debate not quite balancing its use afterward individuals' right to privacy even subsequent to in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example in imitation of the atmosphere is not adequate for humans. CCTV systems may statute for eternity or and no-one else as required to monitor a particular event. A more radical form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, similar to a variety of setting and do its stuff options and additional features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped afterward megapixel sensors, support recording directly to network-attached storage devices, or internal flash for unconditionally stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. practically 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 enlargement in own up surveillance, a substantial rise in the methods of broadminded social monitoring and control, and a host of crime prevention measures throughout the world.

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