The CCTV is a combination of multiple cameras, either stationary or rotating, connected to a corresponding set of closed circuit monitors: these monitors is similar appearance to a regular TV, but lacks the controls that allow the TV tuner viewers to change channels. However, the CCTV comes with color and contrast options to make a lighter or darker image.
Basically, the cameras used in a system of CCTV are connected through the wiring (or, in recent years, wireless) through an encoder, which manages the flow of information corresponding monitor. No matter the type of connection, images from closed circuit television remain within the network of monitors and cameras. This is why the term “closed loop”, such as CCTV monitors can not receive TV or radio or TV can not pick up signals from closed circuit.
The latest technological advances have brought closer the CCTV to computers and television in terms of complexity circuit. Photography and digital imaging have enabled providers publish CCTV systems that allow more camera options and greater image resolution on monitors. In addition, the ability to make smaller cameras allows less obvious surveillance systems and the ability to place cameras in smaller places.
History of Closed Circuit Television
The use of closed circuit television began as an element of security of military preparedness. The first documented use of closed circuit television was in 1942 by the German army. The installation of remote cameras and monitors in black-white was important for observing V2 missile tests in preparation for military attacks long distance. The Germans were not alone in the use of closed circuit television in the 1940s, the United States used the technology in the Manhattan Project. This project involved the development of a nuclear weapon in the deserts of the American Southwest and the closed television allowed scientists and military observe the successful testing of circuit away.
The CCTV was popularized as an instrument of local governance in Britain in the 1980s and 1990s, with the British Home Office with the installation of tens of thousands to control traffic and help fight the rising crime rate. In addition, it became an important tool for the British and American transit authorities in places like London and New York, with cameras placed in taxis, buses and train stations to prevent vandalism and ensure timely transport of customers. In the cities of California in the 1990s, by speeding cameras they were installed at traffic lights in order to track violators of traffic rules and send fines to owners of cars.
In addition, convenience stores and other outlets began to use closed-circuit television in the 1970s and 1980s in order to prevent theft and as a method of crowd control. ATM became more popular in the 1990s, closed circuit television cameras became commonplace in the thousands and thousands of ATMs in all Western cities. In fact, walking down any American or British street since the 1990s means that a system of CCTV probably circuit has captured the image of all those who have walked in the past.