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Closed-circuit television (CCTV), then 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 if nearly all 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 isolate education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas in this area the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in play a role enforcement, afterward cameras located on a police officer's chest or head. Video surveillance has generated significant debate about balancing its use past individuals' right to privacy even behind in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example afterward the atmosphere is not up to standard for humans. CCTV systems may put-on forever or without help as required to monitor a particular event. A more unprejudiced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, bearing in mind a variety of air and accomplish options and additional features (such as endeavor detection and email alerts). More recently, decentralized IP cameras, perhaps equipped in the same way as megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for no question stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. virtually 65% of these cameras are installed in Asia. The enlargement of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant layer in confess 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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