Friday, December 19, 2008

High level basics about CCTV Cameras

CCTV = Closed Circuit TV. In a CCTV security system one or more cameras are used to capture the moving image and send it to a splitter or multiplexer which in tern sends the picture to a VCR(s), DVR(s), or monitor(s). What is the difference between regular and CCTV – simple – CCTV is a closed system and regular is broadcast to the public. 

Because CCTV Is a closed system it is the reason many prefer using it for security and monitoring systems. 

Have you been in a major department store (Wal-Mart, etc) or a grocery store and seem those housing outside or those mirrored domes? What about driving down the street and seeing the camera housing mounting to a traffic signal or on the highway? How about in the ceiling behind your teller in the bank? 

CCTV cameras can be just black and white but most are capable of color in high light conditions and switch to Black and white. 

In simple terms the system works by converting the image seen to electrical impulses which are then sent (in the case of RG59 Coax) via the cable then converted back to recognizable images for display on a TV via the devices mentioned earlier. A moving image (motion) is created simply by taking pictures so rapidly their appears to be motion when in fact you are only looking at a series of pictures displayed in rapid succession.

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