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Closed-circuit television (CCTV), in addition to 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, though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though regarding 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. 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 going on for the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in play a role enforcement, past cameras located on a police officer's chest or head. Video surveillance has generated significant debate virtually balancing its use once individuals' right to privacy even next in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example similar to the quality is not usual for humans. CCTV systems may behave all the time or solitary as required to monitor a particular event. A more radical form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, bearing in mind a variety of quality and perform options and extra features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped once megapixel sensors, withhold 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. roughly 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 growth in permit surveillance, a substantial rise in the methods of advocate social monitoring and control, and a host of crime prevention proceedings throughout the world.

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