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Closed-circuit television(CCTV), also known asvideo surveillance, is the use ofvideo camerasto transmit a signal to a specific place, on a limited set of monitors. It differs frombroadcast televisionin that the signal is not openly transmitted, though it may employ point to point (P2P), point to multi point (P2MP), ormeshwired or wireless links. Though almost all video cameras fit this definition, the term is most often applied to those used forsurveillancein areas that may need monitoring such as bars, banks, casinos, schools, hotels, airports, hospitals, restaurants, military installations, convenience stores and other areas where security is needed.
The camera unit is mounted inside a transparent dome which can be tinted to obscure the camera position. Dome cameras come in a wide variety of forms. They can be analogue or IP, fixed or mobile. PTZ domes can rotate (pan), incline (tilt) or focus closer on objects of interest (zoom).
By Vangie Beal A type of video camera often used in surveillance systems, named because of its shape and size. Bullet cameras are small (2 to 2.5 inches long) and are limited to a fixed focal length lens. Bullet cameras are also called lipstick cameras.