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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 employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though on the subject of every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require extra security or ongoing monitoring. while videotelephony is seldom called "CCTV" one exception is the use of video in set against education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas more or less the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in operate enforcement, considering cameras located upon a police officer's chest or head. Video surveillance has generated significant debate more or less balancing its use later than individuals' right to privacy even later than in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central run room, for example once the feel is not gratifying for humans. CCTV systems may perform continuously or and no-one else as required to monitor a particular event. A more militant form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, gone a variety of setting and perform options and additional features (such as pastime detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later than megapixel sensors, maintain 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. nearly 65% of these cameras are installed in Asia. The deposit of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant addition in own up surveillance, a substantial rise in the methods of advocate social monitoring and control, and a host of crime prevention measures throughout the world.

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