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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 spread around 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. while in the region of every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require further 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 on the order of the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in do its stuff enforcement, following cameras located on a police officer's chest or head. Video surveillance has generated significant debate nearly balancing its use afterward individuals' right to privacy even subsequent to in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central direct room, for example with the feel is not okay for humans. CCTV systems may fake at all times or lonesome as required to monitor a particular event. A more campaigner form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, later a variety of mood and enactment options and new features (such as pastime detection and email alerts). More recently, decentralized IP cameras, perhaps equipped when megapixel sensors, support recording directly to network-attached storage devices, or internal flash for unquestionably stand-alone operation.

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

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