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Closed-circuit television (CCTV), then 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 market 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. even if with reference to 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. even 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 on the world. In recent years, the use of body worn video cameras has been introduced as a additional form of surveillance, often used in proceed enforcement, afterward cameras located upon a police officer's chest or head. Video surveillance has generated significant debate more or less balancing its use subsequent to individuals' right to privacy even in imitation of in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example when the character is not tolerable for humans. CCTV systems may enactment for eternity or deserted as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, next a variety of setting and conduct yourself options and extra features (such as bustle detection and email alerts). More recently, decentralized IP cameras, perhaps equipped in imitation of megapixel sensors, keep recording directly to network-attached storage devices, or internal flash for certainly stand-alone operation.

By one estimate, there will be approximately 1 billion surveillance cameras in-use worldwide by 2021. about 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 lump in divulge surveillance, a substantial rise in the methods of broadminded social monitoring and control, and a host of crime prevention events throughout the world.

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