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Research conducted by the Scottish Centre for Crime and Justice Research and based on a survey of all Scottish local authorities identified that there are over 2,200 public space CCTV cameras in Scotland. [123] The UK has often been cited as a country that has one of the most CCTV cameras in Europe. [124] [125]
Because network cameras are embedded devices, and do not need to output an analogue signal, resolutions higher than closed-circuit television 'CCTV' analogue cameras are possible. A typical analogue CCTV camera has a PAL (768x576 pixels ) or NTSC (720x480 pixels), whereas network cameras may have VGA (640x480 pixels), SVGA (800x600 pixels) or ...
Wireless security cameras function best when there is a clear line of sight between the camera(s) and the receiver. If digital wireless cameras are outdoors and have a clear line of sight, they typically have a range between 250 and 450 feet.
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Since the coaxial cables originally used for the analog system have significant unused data spectrum available, it is a simple matter to just replace the camera and the recorder to obtain nearly seven times higher detail (1920x1080 vs 640x480) than the original camera system.
About 65% of these cameras are installed in Asia. The growth of CCTV has been slowing in recent years. [43] In 2018, China was reported to have a huge surveillance network of over 170 million CCTV cameras with 400 million new cameras expected to be installed in the next three years, many of which use facial recognition technology. [44]