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Closed-circuit television (CCTV), as a consequence 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 broadcast television in that the signal is not openly transmitted, while it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even if almost every 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 set against education, where it is an important tool.

Surveillance of the public using CCTV is common in many areas with reference to the world. In recent years, the use of body worn video cameras has been introduced as a supplementary form of surveillance, often used in act out enforcement, gone cameras located upon a police officer's chest or head. Video surveillance has generated significant debate approximately balancing its use past individuals' right to privacy even next in public.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example like the quality is not good enough for humans. CCTV systems may perform until the end of time or unaccompanied as required to monitor a particular event. A more enlightened form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, past a variety of mood and take steps options and further features (such as occupation detection and email alerts). More recently, decentralized IP cameras, perhaps equipped considering megapixel sensors, sustain recording directly to network-attached storage devices, or internal flash for entirely 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 mass of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant increase in permit surveillance, a substantial rise in the methods of forward looking social monitoring and control, and a host of crime prevention events throughout the world.

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