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Closed-circuit television (CCTV), plus 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 shout out 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 on the subject of 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. even 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 order of the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in feign enforcement, in the same way as cameras located upon a police officer's chest or head. Video surveillance has generated significant debate very nearly balancing its use taking into consideration individuals' right to privacy even bearing in mind in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example with the atmosphere is not standard for humans. CCTV systems may put-on forever or deserted as required to monitor a particular event. A more liberal form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, later a variety of air and take action options and extra features (such as action 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 definitely stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. practically 65% of these cameras are installed in Asia. The growth 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 militant social monitoring and control, and a host of crime prevention measures throughout the world.

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