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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, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though on 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. though videotelephony is seldom called "CCTV" one exception is the use of video in isolate education, where it is an important tool.

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

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example with the character is not up to standard for humans. CCTV systems may feint all the time or unaided as required to monitor a particular event. A more protester form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, like a variety of mood and function options and new features (such as interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later megapixel sensors, support recording directly to network-attached storage devices, or internal flash for definitely 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 buildup of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant bump in welcome surveillance, a substantial rise in the methods of enlightened social monitoring and control, and a host of crime prevention dealings throughout the world.

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