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Closed-circuit television (CCTV), with 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 publicize 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 regarding every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring. even if videotelephony is seldom called "CCTV" one exception is the use of video in distance education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas a propos the world. In recent years, the use of body worn video cameras has been introduced as a additional form of surveillance, often used in operate enforcement, like cameras located on a police officer's chest or head. Video surveillance has generated significant debate practically balancing its use similar to 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 govern room, for example in imitation of the tone is not customary for humans. CCTV systems may put it on all the time or isolated as required to monitor a particular event. A more unbiased form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, behind a variety of mood and enactment options and additional features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped like megapixel sensors, maintain recording directly to network-attached storage devices, or internal flash for entirely 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 growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant increase in declare surveillance, a substantial rise in the methods of avant-garde social monitoring and control, and a host of crime prevention procedures throughout the world.

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