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Closed-circuit television (CCTV), afterward 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 make public television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while going on for 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. even though 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 a propos the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in be in enforcement, next cameras located on a police officer's chest or head. Video surveillance has generated significant debate about balancing its use behind individuals' right to privacy even once in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example considering the quality is not okay for humans. CCTV systems may action all the time or forlorn as required to monitor a particular event. A more avant-garde form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, taking into account a variety of vibes and affect options and extra features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped afterward megapixel sensors, retain recording directly to network-attached storage devices, or internal flash for totally stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. more or less 65% of these cameras are installed in Asia. The accumulation 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 enlightened social monitoring and control, and a host of crime prevention trial throughout the world.

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