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Closed-circuit television (CCTV), next 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 broadcast 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. even though roughly all 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. while 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 in this area the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in play in enforcement, taking into account cameras located upon a police officer's chest or head. Video surveillance has generated significant debate practically balancing its use when individuals' right to privacy even in the same way as in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central govern room, for example considering the quality is not all right for humans. CCTV systems may do something for all time or solitary as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in the same way as a variety of setting and play in options and supplementary features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped later than megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for no question 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 bump in let in surveillance, a substantial rise in the methods of unbiased social monitoring and control, and a host of crime prevention measures throughout the world.

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