Security surveillance system consists of several elements , the cameras are of two types (indoor as Dome , Outdoor as bullet ), the Degital video recorder ( DVR ) has several measurements (4 channel, 8-channel, 16-channel and 32-channel) as well as the hard drive to store video and finally the screen to display cameras video , directly and to review the recordings
It is most prevalent in the past until the advent of new technologies in 2004, works to the principle of analog technology and has limited accuracy and the maximum clarity up to 720 TV line .
a system that is developing an analog system , where it was increasing its visibility and change the principle of work of the television lines to the pixel, a display technology commensurate with digital screens, HD equivalent 720P, and Full HD equivalent 1080P .
the new system had its beginnings in 2004, it supports TCP / IP technology and can thus access to high resolution display up to 12 megapixels and techniques presented to 4K screens, and IP system has several advantages not available in previous systems, the most important POE, a power supply for the cameras through the same network wires and without additional electricity wires, and some features like a smart cameras that can detect and capture faces, capture vehicle plate number , calculate the number of visitors of public places etc
