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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, on a limited set of monitors. It differs from market television in that the signal is not openly transmitted, though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though concerning every 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. while videotelephony is seldom called "CCTV" one exception is the use of video in push away education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas around the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in play a part enforcement, in the manner of cameras located upon a police officer's chest or head. Video surveillance has generated significant debate virtually balancing its use following individuals' right to privacy even bearing in mind in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example taking into consideration the quality is not conventional for humans. CCTV systems may take steps until the end of time or forlorn as required to monitor a particular event. A more broadminded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, considering a variety of character and perform options and further features (such as doings detection and email alerts). More recently, decentralized IP cameras, perhaps equipped past megapixel sensors, support recording directly to network-attached storage devices, or internal flash for entirely stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. not quite 65% of these cameras are installed in Asia. The increase of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accumulation in declare surveillance, a substantial rise in the methods of advanced social monitoring and control, and a host of crime prevention proceedings throughout the world.

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