CCTVCCTV / Closed Circuit Television / is a video surveillance system in which the cycle is closed and all elements are directly connected by cable or wireless technology. Perhaps the most widely known is the application of CCTV security systems in shops, banks, government departments, offices, etc. But in reality the scope of application is almost unlimited.
Examples: Monitoring the traffic bridge; Temporary system for conducting traffic study in the city center; Monitoring of football stadiums; Hidden in buses to control the disorder and vandal events; Production control in the factory. The list is almost endless and depends only on the imagination. Main components of video surveillance systems System for video surveillance can be divided into three main components: camera, monitor and recording device. These are the main components. Of course, additional equipment is required for larger areas, or for monitoring in real time.
Security cameras have different sizes, use different methods for communication and visual capabilities. Most cameras use CCD / Charge Coupled-Device / technology. This technology uses a small piece of silicon instead of film to receive the image captured by the lens. Then it turned into electrical pulsation. The size of the light sensing matrix and whether you need a black and white (B/W) or color images must be taken into account when choosing a camera. Also the lighting of the area must be checked before you can choose. For example: an average security camera has CCD matrix size of 1/3”. This size provides sufficient image quality. For low lighting environments size between 1/3" and 1" is a good idea.
It is also known that black and white cameras provide better image than color cameras in areas with poor lighting. Also important is the camera sensitivity to light. Lux is a measure of sensitivity, i.e. light quantity of square meters. Low lux units in the specification of the camera means that it has increased ability to work in conditions of poor lighting.
Another point is the resolution of the camera. Just as in digital cameras and computer monitors, the resolution refers to the image quality that you get. The measure for CCTV camera resolution can be TVL parameter. A higher value of TVL means better quality. The average security camera is about 430 TVL.
 Monitor for the CCTV system must be consistent with the resolution of cameras used. Be sure to consult a professional before making decisions.
 Recorder
The market offers two basic types of recording devices based on the VCR or DVR technology. We strongly suggest your DVR to record your video surveillance system. DVR enables you to select the precise moment to record the data you want to see. Management of the DVR is convenient and easy and offers a different speed record. Monitoring software can always be upgraded to add more memory. Again we recommend, before purchasing a system for video surveillance, to consult a professional.
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