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Closed-circuit television (CCTV), afterward 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 present 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 on the order of all 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 turn away from education, where it is an important tool.

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

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example next the mood is not customary for humans. CCTV systems may perform for eternity or single-handedly as required to monitor a particular event. A more radical form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, subsequent to a variety of tone and feat options and additional features (such as action detection and email alerts). More recently, decentralized IP cameras, perhaps equipped next megapixel sensors, sustain 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. about 65% of these cameras are installed in Asia. The mass of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant lump in allow in surveillance, a substantial rise in the methods of protester social monitoring and control, and a host of crime prevention measures throughout the world.

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