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Closed-circuit television (CCTV), with 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 shout out television in that the signal is not openly transmitted, even if it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. even though approximately all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require extra security or ongoing monitoring. though 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 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 performance enforcement, with cameras located on a police officer's chest or head. Video surveillance has generated significant debate more or less balancing its use taking into consideration 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 control room, for example as soon as the tone is not gratifying for humans. CCTV systems may undertaking for all time or and no-one else as required to monitor a particular event. A more futuristic form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, gone a variety of vibes and put it on options and other features (such as leisure interest detection and email alerts). More recently, decentralized IP cameras, perhaps equipped taking into consideration megapixel sensors, sustain recording directly to network-attached storage devices, or internal flash for unquestionably 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 buildup in declare surveillance, a substantial rise in the methods of protester social monitoring and control, and a host of crime prevention proceedings throughout the world.

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