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Closed-circuit television (CCTV), in addition to 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 publicize television in that the signal is not openly transmitted, even though it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. while a propos all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require further security or ongoing monitoring. though videotelephony is seldom called "CCTV" one exception is the use of video in estrange education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas all but the world. In recent years, the use of body worn video cameras has been introduced as a extra form of surveillance, often used in fake enforcement, afterward cameras located upon a police officer's chest or head. Video surveillance has generated significant debate about balancing its use behind 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 manage room, for example past the tone is not satisfactory for humans. CCTV systems may operate forever 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, later a variety of setting and do its stuff options and extra features (such as doings detection and email alerts). More recently, decentralized IP cameras, perhaps equipped similar to megapixel sensors, preserve recording directly to network-attached storage devices, or internal flash for completely 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 addition of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant growth in allow in surveillance, a substantial rise in the methods of protester social monitoring and control, and a host of crime prevention events throughout the world.

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