Closed-circuit Television (CCTV) System is primarily designed for surveillance purposes which is used in a wide variety of applications which include security, disaster prevention, manpower saving, industrial measurement and military fields. In security application, the CCTV system help crime prevention by let criminals know the risks of crime and function as a deterrent of crime or keep constant watch over potential criminal acts. It also help identify criminals after crimes are perpetrated by reviewing recorded images resulting from the installed CCTV system.
For the past ten years, CCTV system with differ in type, quality and technology has moved on significantly. There are two main types of systems: