CCTV systems were first introduced in the US and UK in the 60s and 70s.
CCTV systems in the 60s were very simple, consisting of very low resolution cameras, black and white and connected by coaxial cable. Each camera is connected to a black and white monitor. A 16 camera configuration takes 16 monitor cameras
CCTV technology continues to grow in the 60s. First of all, the switch box is added. Switch box A will allow the operator to switch between cameras. Only one camera can be viewed at a time.
In the 70s decade appeared Multiplexer, VCR (Video Recorder). Multiplexer allows the screen to be split into multiple frames on the same monitor. VCRs can record easily and distribute video.
In the 80s it was known that Video recorder was a lot of trouble. The quality of recording is very bad. The combination of low resolution images, poor video cassettes and low quality technology solutions leads to blurry and unclear images that can not be used for convincing identification purposes.
VCR technology does not allow operators to view and record events simultaneously and it is a very time-consuming process to discover and view specific events. There is no ability to detect motion and can not see and monitor events from remote locations.
CCTV ‘Next generation’ appeared in the mid 90s. This new technology is computer-based. Digital Video Recorder (DVR) allows images to be recorded at a much higher resolution than before. The DVR solves all the problems of a first-generation CCTV (VCR) system such as forgetting to change the recording, the damaged VCR recording tape.
DVR recording automatically. When viewing the recording, the DVR will continue to record. And now the user can choose the recording which will be seen by date & time of the incident. DVRs also use IP (Internet Protocol) technology that allows users to view from anywhere and can fully control the camera and the system itself via a local area network (LAN), wide area network (WAN) or over the internet. With such flexible access, the latest generation of CCTV cameras can be operated remotely from the control center or, even anywhere with internet access.
PTZ cameras (Pan, Tilt & Zoom) have higher resolution options, a wide range of lenses and are also capable of operating at night. Audio is also now part of the CCTV DVR technology. Now users can tune video images with audio analysis.