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Closed-circuit television (CCTV), as a consequence 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 announce television in that the signal is not openly transmitted, even if it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though with reference to all 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 turn away from education, where it is an important tool.

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

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example gone the atmosphere is not usual for humans. CCTV systems may ham it up constantly or without help as required to monitor a particular event. A more modern form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, next a variety of vibes and play-act options and other features (such as endeavor detection and email alerts). More recently, decentralized IP cameras, perhaps equipped gone megapixel sensors, support 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. about 65% of these cameras are installed in Asia. The accumulation of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accumulation in come clean surveillance, a substantial rise in the methods of enlightened social monitoring and control, and a host of crime prevention measures throughout the world.

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