How CCTV cameras operate
CCD chip size & chip sets
A CCTV camera’s main purpose is to convert light into video signals. A CCD (Charge Coupled device) sensor is at the heart of a CCTV. The CCD sensor converts light to an electrical signal. Signal processing transforms an electrical signal into a video signal which can be displayed or recorded.
CCDs are optical detector integrated circuits made of semiconductors. The CCD image sensor is illuminated by the camera lens. Photodiodes detect the areas of dark and light in the image and produce an electrical charge proportional to this. The charge will be higher in areas that are brighter. The picture cells, or pixels, are a matrix made up of rows and columns. The diodes’ charge is then processed. When you need CCTV Installation Gloucester, visit https://apmfireandsecurity.com/cctv-security-systems/cctv-installation-gloucester
Analogue Vs Digital
Analogue
Analogue cameras capture analogue signals, which are then transferred to a DVR (Digital Video Recorder) via coax cables. The DVR compresses and converts the analogue signal into a digital format. It then stores it on the DVR’s hard drive. The DVR can display the footage on monitors or send the signal across a network so that it can be displayed on a computer. When using analogue cameras, the DVR can transmit via the internet. All of the signals from the cameras are sent in one stream with a single IP address.
Digital IP network camera
Digital IP (Internet Protocol cameras) capture analogue signals, which are then converted into digital signals within the camera. The camera may also perform digital processing. The digital signal will then be sent over a LAN. Ethernet cables are used, for example.
In place of an analogue DVR system, IP cameras record the video compressed from each camera onto an NVR. The main difference is the digital signal and higher resolution than analogue.
