Numerous security tools can help you safeguard your possessions. One of the most common tools is a home security camera. Being able to monitor others can decrease your chances of being a victim of crime. more »
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Closed-circuit television (CCTV) 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 wireless links. CCTV is often used for surveillance in areas that may need monitoring such as banks, casinos, airports, military installations, and convenience stores.
In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room; when, for example, 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).
Surveillance of the public using CCTV is particularly common in the UK, where there are reportedly more cameras per person than in any other country in the world.Lewis>Lewis, Paul. , The Guardian, March 2, 2009. There and elsewhere, its increasing use has triggered a debate about security versus privacy.
History
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."dornberger">Dornberger, Walter: V-2, Ballantine Books 1954, ASIN: B000P6L1ES, page 14. The noted German engineer Walter Bruch was responsible for the design and installation of the system.
CCTV recording systems are still often used at modern launch sites to record the flight of the rockets, in order to find the possible causes of malfunctions, while larger rockets are often fitted with CCTV allowing pictures of stage separation to be transmitted back to earth by radio link.
In September 1968, Olean, New York was the first city in the United States to install video cameras alo read more at » http://en.wikipedia.org/wiki/Closed-circuit+television
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