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CCTV systems link security cameras with monitors, providing viewers with a real-time view of what the cameras see. They do not operate on a traditionally broadcast television signal, but a direct connection via cables.
CCTV systems usually use high-quality cameras at entry points such as doors and airport gates, for the purpose of collecting clear evidence. Wide angle lenses are used in the interior spaces to keep track of people. Usually, CCTV systems must have a person monitoring the system, even though the camera feed is recorded on video tape or a digital video recorder. However, CCTV system technology being developed that allows cameras to focus on "questionable" behavior without the aid of a human being. This will allow for greater efficiency on monitoring CCTV systems.
London currently has the most encompassing CCTV system, where cameras have been placed in parking lots and on streets. As a result, car crimes have decreased. However, critics have charged CCTV systems with invasions of privacy and loss of civil liberties. Another claim is that CCTV systems do not prevent crime, but rather shift it to places CCTV systems cannot see. While CCTV systems do act as criminal deterrents, this happens only if criminals can see the security cameras. Otherwise, the technology is used more for identifying criminals.
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