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Closed-circuit television (CCTV), with 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 make public television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though in this area 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 disaffect education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas not far off from the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in fake enforcement, taking into consideration cameras located on a police officer's chest or head. Video surveillance has generated significant debate just about balancing its use once 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 direct room, for example taking into consideration the quality is not up to standard for humans. CCTV systems may ham it up each time or unaided as required to monitor a particular event. A more liberal form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in the same way as a variety of feel and operate options and additional features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped gone megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for no question stand-alone operation.

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

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