CCTV

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 broadcast television in that the signal is not openly transmitted, though it may employ point topoint (P2P), point to multipoint, or mesh wireless links. Though almost all video cameras fit this definition, the term is most often appliedto those used for surveillance in areas that may need monitoring such as banks, casinos, airports, military installations, and conveniencestores. Videotelephony is seldom called "CCTV" but the use of video in distance education, where it is an important tool, is often so called.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example when the envir-onment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event. A moreadvanced form of CCTV, utilizing digital video recorders[3] (DVRs), provides recording for possibly many years, with a variety of qualityand performance options and extra features (such as motion detection and email alerts). More recently, decentralized IP cameras, someequipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation. Surveillance of the public using CCTV is particularly common in many areas around the world.