CCTV cameras are used in homes, shops, banks, supermarkets, apartment buildings, parking spaces and many more. Closed circuit television systems transmit signals to a specific location that could be viewed by a monitor or set of monitors. They are used for surveillance in security measures and in industrial plants as observing equipment in places not conducive for human presence. It is usually done from a monitoring room. Some CCTV cameras function throughout the day continuously while others may operate only at particular times. UK has more surveillance cameras per person than any other country. CCTV cameras are fixed in public spaces, city centres, roadsides and to monitor traffic. In UK public CCTV cameras are aimed at preventing and reducing crime.
Advanced CCTV systems use DVRs, which can feature recording for several years with various options and features. In subways and amusement park rides CCTVs are used to deliver a safer transportation service. These are also used in vehicles to monitor when reversing. HD CCTV cameras, which use computer controlled technology can identify, track and categorize objects. Video Content Analysis can automatically analyse videos recorded. The technology can detect changes in the environment and identify and compare objects. In these situations the camera can issue a warning through an alarm if it detects any vandalism on the lens, see something missing or if a certain movement is recognised. VCA can inform of unusual occurring in the environment. These sensitive cameras can note when something that is unusual is happening.
VCAs in CCTVs can track a person throughout the entire location. The cameras follow the movements of the person and by using multiple cameras you can cover the entire arena. CCTV and face recognition technology have been combined for face recognition in security cameras. Wireless security cameras too are available for different security options. A security power supply is used for CCTVs for powering them. These can include DC-DC converters, single and dual output AC-DC and AC-DC enclosed switching power supplies. There are many variations of a security power supply. These protect the CCTV against power surges, short circuit, overload and over protection. These are built for high efficiency, low working temperature and low noise.