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Closed-circuit television (CCTV), as a consequence 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 present 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. while approximately 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. though videotelephony is seldom called "CCTV" one exception is the use of video in push away education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas approximately the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in undertaking enforcement, in the same way as cameras located upon a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use similar to 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 control room, for example bearing in mind the tone is not suitable for humans. CCTV systems may operate continuously or deserted as required to monitor a particular event. A more militant form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in the manner of a variety of character and pretense options and additional features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped considering megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for no question stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. virtually 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 accrual in confess surveillance, a substantial rise in the methods of advocate social monitoring and control, and a host of crime prevention procedures throughout the world.

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