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Closed-circuit television (CCTV), next 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 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 all but all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require extra security or ongoing monitoring. though videotelephony is seldom called "CCTV" one exception is the use of video in distance 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 additional form of surveillance, often used in play-act enforcement, like cameras located upon a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use gone individuals' right to privacy even past in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example considering the environment is not good enough for humans. CCTV systems may perform each time or abandoned as required to monitor a particular event. A more innovative form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in imitation of a variety of vibes and put-on options and other features (such as doings detection and email alerts). More recently, decentralized IP cameras, perhaps equipped subsequent to megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for definitely stand-alone operation.

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

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