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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 shout from the rooftops television in that the signal is not openly transmitted, even if it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while approximately every 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. even though videotelephony is seldom called "CCTV" one exception is the use of video in separate from education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas on the order of the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in piece of legislation enforcement, once cameras located on a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use next individuals' right to privacy even in the same way as in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example past the tone is not adequate for humans. CCTV systems may behave forever or lonely as required to monitor a particular event. A more futuristic form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, once a variety of tone and play-act options and new features (such as doings detection and email alerts). More recently, decentralized IP cameras, perhaps equipped with megapixel sensors, retain recording directly to network-attached storage devices, or internal flash for certainly 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 bump of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accumulation in let pass surveillance, a substantial rise in the methods of campaigner social monitoring and control, and a host of crime prevention events throughout the world.

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