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Closed-circuit television (CCTV), as well as 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, even though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while roughly every 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. even if videotelephony is seldom called "CCTV" one exception is the use of video in set against education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas just about the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in do something enforcement, similar to 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 similar to in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example afterward the air is not tolerable for humans. CCTV systems may deed continually or lonesome as required to monitor a particular event. A more forward looking form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, gone a variety of setting and perform options and other features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped past megapixel sensors, withhold recording directly to network-attached storage devices, or internal flash for totally stand-alone operation.

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

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