Closed circuit television systems
Closed circuit television (CCTV) systems, also known as video surveillance or security camera systems, effectively allow video cameras to be used to broadcast a signal to a specific location and limited number of screens. It’s different from a television broadcast because the signal isn’t open to all, though it can be viewed point to point (P2P) or from one point to numerous points or over a network of wireless connections. Although almost all video cameras fit that definition, CCTV is more often applied to cameras used for surveillance in areas that need to be monitored like banks, casinos, airports, military facilities and shops.
At industrial facilities, CCTV can be used to monitor a process from a main control room, especially in situations where the environment may not be suitable for humans. CCTV can also be operated round the clock or simply to monitor a specific event. In a more advanced version of CCTV, digital video recorders (DVRs) can be used to record video over the course of many days, offering numerous options when it comes to quality and performance and a host of other features (such as motion detectors or email alerts). More recently IP cameras -some of which are fitted with megapixel sensors- have been used to record to storage devices on a network or to internal flash drives enabling them to operate completely autonomously. Crowd surveillance using CCTV is particularly widespread in many parts of the world.