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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, on a limited set of monitors. It differs from shout out television in that the signal is not openly transmitted, even if it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while concerning all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require supplementary security or ongoing monitoring. though videotelephony is seldom called "CCTV" one exception is the use of video in estrange education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas approximately 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 its stuff enforcement, bearing in mind cameras located on a police officer's chest or head. Video surveillance has generated significant debate just about balancing its use gone individuals' right to privacy even subsequently in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example taking into consideration the mood is not agreeable for humans. CCTV systems may pretense every time or unaided 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, once a variety of vibes and act out options and supplementary features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later megapixel sensors, maintain recording directly to network-attached storage devices, or internal flash for very 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 growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant deposit in divulge surveillance, a substantial rise in the methods of unprejudiced social monitoring and control, and a host of crime prevention procedures throughout the world.

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