Closed-circuit television (CCTV), also 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 puff television in that the signal is not openly transmitted, while it may hire point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. though just about 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 keep apart from education, where it is an important tool.
Surveillance of the public using CCTV is common in many areas on the order of the world. In recent years, the use of body worn video cameras has been introduced as a further form of surveillance, often used in measure enforcement, in the same way as cameras located on a police officer's chest or head. Video surveillance has generated significant debate more or less balancing its use behind individuals' right to privacy even considering in public.
In industrial plants, CCTV equipment may be used to observe parts of a process from a central manage room, for example later the character is not tolerable for humans. CCTV systems may operate every time or only as required to monitor a particular event. A more ahead of its time form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, in the same way as a variety of character and measure options and further features (such as pursuit detection and email alerts). More recently, decentralized IP cameras, perhaps equipped behind megapixel sensors, hold recording directly to network-attached storage devices, or internal flash for definitely 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 growth of CCTV has been slowing in recent years. The deployment of this technology has facilitated a significant addition in give access surveillance, a substantial rise in the methods of objector social monitoring and control, and a host of crime prevention events throughout the world.
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