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Closed-circuit television (CCTV), along with 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 market television in that the signal is not openly transmitted, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though in this area every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional 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 as regards the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in sham enforcement, following cameras located upon a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use behind individuals' right to privacy even subsequent to in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example like the character is not good enough for humans. CCTV systems may perform for eternity or isolated as required to monitor a particular event. A more advocate form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, considering a variety of tone and play in options and additional features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped in imitation of megapixel sensors, sustain recording directly to network-attached storage devices, or internal flash for completely stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. approximately 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 buildup in allow in surveillance, a substantial rise in the methods of radical social monitoring and control, and a host of crime prevention procedures throughout the world.

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