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Closed-circuit television (CCTV), as well as 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 known television in that the signal is not openly transmitted, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while in this area every 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 keep apart from education, where it is an important tool.

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

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example taking into consideration the quality is not adequate for humans. CCTV systems may con continually or lonely as required to monitor a particular event. A more unbiased form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, similar to a variety of atmosphere and affect options and further features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped like megapixel sensors, support recording directly to network-attached storage devices, or internal flash for unconditionally stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. roughly 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 layer in permit surveillance, a substantial rise in the methods of avant-garde social monitoring and control, and a host of crime prevention proceedings throughout the world.

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