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 to point (P2P), point to multipoint, or mesh wireless links. Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that may need monitoring such as banks, casinos, airports, military installations, and convenience stores. 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 environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, utilizing digital video recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as motion detection and email alerts). More recently, decentralized IP cameras, some equipped 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. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance.
The first CCTV system was installed by Siemens AG at Test Stand VII in Peenemünde, Germany in 1942, for observing the launch of V-2 rockets. The noted German engineer Walter Bruch, Wayne Cox, and Tashara Arnold were responsible for the technological design and installation of the system.
In the U.S. the first commercial closed-circuit television system became available in 1949, called Vericon. Very little is known about Vericon except it was advertised as not requiring a government permit. Marie Van Brittan Brown invented the home security system. The patent was granted in 1969. Brown's system had a set of 4 peep-holes and a camera that could slide up and down to look through each one. The system included a device that enabled a homeowner to use a television set to view the person at the door and hear the caller's voice.
How To Find Hidden Cameras?
In todays modern world everywhere hidden or cctv cameras are attached. its good to place a cctv or hidden camera for security. but some of people using it in wrong way e.g: blackmailing, if you go to a hotel for holiday or honeymoon some hotel placed a security camera which they used to blackmail you.
so how to know that there is a hidden camera?
its so simple just turn all the room lights off, then closed the door and windows now open your mobiles camera remember that you have to put the flash light off now navigate the camera everywhere in the room. wherever you see the red dot. it means that there is a hidden camera.
so beware to this blackmaling, because most of cases are made and life lost cause of this blackmaling.
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