1,what's the CCTV?
Closed Circuit Television (CCTV) is a system where the circuit in which the video is transmitted is closed and all the elements (camera, display monitors, recording devices) are directly connected. This is unlike broadcast television where any receiver that is correctly tuned can pick up and display or store the signal. In the past, these signals would be transmitted to a monitor equipped with a video cassette recorder, but these have been all but totally replaced by digital video recorder (DVR) systems that can store far more video and back up data automatically
2,where to use the CCTV?
2.1 The most widely known use of CCTV is in security camera systems. They’ve been found for years in areas like large retail shops, banks, and government institutions. Thanks to reduced costs in the manufacture of cameras and video recording equipment, camera systems are becoming more and more commonplace in smaller businesses, and even private homes.
2.2 CCTV has become ubiquitous in large cities, along major highways, and areas that host large events. On streets and roads it is often used in traffic law enforcement, but is also often used in monitoring traffic patterns, allowing emergency services to react quickly to accidents and for maintenance departments to better plan necessary construction projects. In hotels, stadiums, and convention centers, CCTV is often used in private television networks, broadcasting sporting events or special events throughout their facilities.
2.3 Most airports and train stations throughout the world have installed security cameras connected to CCTV systems with the goal of combating terrorism. These video feeds are constantly monitored by local and international law enforcement agencies in an effort to keep travellers safe
