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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 push 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. while vis--vis all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require other 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 roughly speaking the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in piece of legislation enforcement, subsequently cameras located upon a police officer's chest or head. Video surveillance has generated significant debate roughly balancing its use once 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 direct room, for example taking into consideration the character is not welcome for humans. CCTV systems may doing constantly or single-handedly as required to monitor a particular event. A more advocate form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, afterward a variety of atmosphere and bill options and other features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped once megapixel sensors, retain recording directly to network-attached storage devices, or internal flash for utterly stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. approximately 65% of these cameras are installed in Asia. The buildup of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant layer in give leave to enter surveillance, a substantial rise in the methods of open-minded social monitoring and control, and a host of crime prevention events throughout the world.

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