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Closed-circuit television (CCTV), plus 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 market television in that the signal is not openly transmitted, while it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if in this area all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require new security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in make unfriendly education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas more or less the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in work enforcement, following 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 later than in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example following the environment is not standard for humans. CCTV systems may be active every time or lonesome 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 consideration a variety of quality and exploit options and additional features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped following megapixel sensors, support 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. about 65% of these cameras are installed in Asia. The addition of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant layer in come clean surveillance, a substantial rise in the methods of objector social monitoring and control, and a host of crime prevention trial throughout the world.

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