What Is CCTV
CCTV, Closed Circuit Tele Vision, is a TV system in which the circuit is closed and all the elements are directly connected i.e. it does not broadcast TV signals to public but transmits them over to desired monitors. First CCTV system was installed by Siemens AG in Germany in 1942.CCTV system usually utilizes CCD video cameras (which are used for producing the video), cable or wireless transmitters or receivers, and monitors (to see the video). The video can also be transmitted over the Internet. CCTV system is not only applied to the security and surveillance purpose but also to the other fields like laboratory in schools or in private companies, even to production lines in factories. Any kind of on-site video technology can also use CCTV for video conference that is only accessible for a select audience. As the application of CCTV system increased, the CCTV industry has developed variety of CCTV equipment.
CCTV systems provide real time or digitally recorded surveillance information to help in detecting, investigating and providing evidence for security and safety. A CCTV system may also be used to prevent security breaches by allowing security personnel to monitor access control systems at entry points to secure areas. The size of a CCTV system may depend on how and where it is used. Basic elements which are used in it are the same regardless of its applications. A CCTV system can contain a number of cameras as well.
CCTV cameras can be useful for criminals also. For example – A hidden camera at an ATM to capture people’ PINs without their knowledge can be very dangerous and can be used by the criminal for any sort of misuse. Some criminals deliberately destroy cameras. They also spray substances over the lens so that the image cannot be read properly. Cameras used in CCTV systems should come with Dust tight, pressurized, explosion proof, and Bullet resistant housing.
CCTV has come a long way in recent years. Systems are capable of surprisingly clear image detail with the introduction of Mega pixel technology into the surveillance industry. Due to such an enhancement in the technology it is possible to replace several standard cameras with a single camera which further results in reducing the initial costs.