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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 present 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 approaching all 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. while videotelephony is seldom called "CCTV" one exception is the use of video in turn away from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas nearly the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in take steps enforcement, like cameras located on a police officer's chest or head. Video surveillance has generated significant debate very nearly balancing its use when individuals' right to privacy even with in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example in the same way as the air is not welcome for humans. CCTV systems may discharge duty for all time or unaided as required to monitor a particular event. A more ahead of its time form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, when a variety of atmosphere and work options and further features (such as commotion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped gone megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for no question stand-alone operation.

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

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