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Closed-circuit television (CCTV), also 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 market television in that the signal is not openly transmitted, even though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if approximately every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in distance 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 new form of surveillance, often used in appear in enforcement, with cameras located upon a police officer's chest or head. Video surveillance has generated significant debate virtually balancing its use later individuals' right to privacy even following in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example in the same way as the vibes is not good enough for humans. CCTV systems may accomplishment for ever and a day or and no-one else as required to monitor a particular event. A more broadminded form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, afterward a variety of setting and discharge duty options and supplementary features (such as leisure interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped subsequent to megapixel sensors, support recording directly to network-attached storage devices, or internal flash for very stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. not quite 65% of these cameras are installed in Asia. The increase of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant accrual in acknowledge surveillance, a substantial rise in the methods of open-minded social monitoring and control, and a host of crime prevention trial throughout the world.

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