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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 broadcast 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 roughly speaking every 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. even though 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 approximately the world. In recent years, the use of body worn video cameras has been introduced as a other form of surveillance, often used in produce a result enforcement, like cameras located upon a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use next 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 direct room, for example subsequent to the quality is not normal for humans. CCTV systems may do something continually or lonely as required to monitor a particular event. A more futuristic form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in imitation of a variety of feel and exploit options and additional features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped taking into consideration megapixel sensors, withhold recording directly to network-attached storage devices, or internal flash for completely stand-alone operation.

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

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