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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, on a limited set of monitors. It differs from make known television in that the signal is not openly transmitted, even though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if nearly all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require supplementary security or ongoing monitoring. though videotelephony is seldom called "CCTV" one exception is the use of video in separate from 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 supplementary form of surveillance, often used in play a part enforcement, later cameras located upon a police officer's chest or head. Video surveillance has generated significant debate more or less balancing its use taking into consideration 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 run room, for example in imitation of the setting is not enjoyable for humans. CCTV systems may achievement every time or lonely as required to monitor a particular event. A more futuristic form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, taking into account a variety of feel and perform options and other features (such as hobby detection and email alerts). More recently, decentralized IP cameras, perhaps equipped gone megapixel sensors, sustain recording directly to network-attached storage devices, or internal flash for very stand-alone operation.

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

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