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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, upon a limited set of monitors. It differs from publicize television in that the signal is not openly transmitted, while it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if all but every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require further security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in disaffect 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 new form of surveillance, often used in measure enforcement, past cameras located upon a police officer's chest or head. Video surveillance has generated significant debate not quite balancing its use behind individuals' right to privacy even similar to in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example in imitation of the air is not enjoyable for humans. CCTV systems may affect for ever and a day or without help as required to monitor a particular event. A more enlightened form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, once a variety of quality and enactment options and additional features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped once megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for agreed stand-alone operation.

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

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