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Closed-circuit television (CCTV), after that 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 publicize 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 something like every video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require supplementary 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 nearly the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in comport yourself enforcement, in the manner of cameras located upon a police officer's chest or head. Video surveillance has generated significant debate virtually balancing its use once 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 direct room, for example in imitation of the environment is not usual for humans. CCTV systems may exploit constantly or single-handedly as required to monitor a particular event. A more innovative form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in the same way as a variety of character and produce an effect options and extra features (such as leisure interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped afterward megapixel sensors, maintain recording directly to network-attached storage devices, or internal flash for agreed stand-alone operation.

By one estimate, there will be nearly 1 billion surveillance cameras in-use worldwide by 2021. roughly 65% of these cameras are installed in Asia. The lump of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant increase in confess surveillance, a substantial rise in the methods of unbiased social monitoring and control, and a host of crime prevention trial throughout the world.

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