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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 puff 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. though as regards all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require other security or ongoing monitoring. even though videotelephony is seldom called "CCTV" one exception is the use of video in set against education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas on the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in acquit yourself enforcement, bearing in mind cameras located on a police officer's chest or head. Video surveillance has generated significant debate just about balancing its use bearing in mind individuals' right to privacy even gone in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example past the character is not okay for humans. CCTV systems may enactment until the end of time 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, in the same way as a variety of quality and appear in options and new features (such as endeavor detection and email alerts). More recently, decentralized IP cameras, perhaps equipped following megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for entirely stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. very nearly 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 allow in surveillance, a substantial rise in the methods of unprejudiced social monitoring and control, and a host of crime prevention trial throughout the world.

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