The market has an abundance of different models of CCTV cameras, recorders and associated equipment. Cameras have varying degrees of quality, resolution and capability some which have the ability to view scenes in low light conditions using IR (Infrared Illumination) .A camera’s clarity can be measured in TV lines or pixels. Analog cameras are measured in TV lines and IP network cameras are measured in pixels. The higher number of TV lines or pixels the more superior the detail achieved. Images from analog cameras are digitised by a DVR or a video encoder .It should be remembered that the maximum resolution a conventional analog camera can provide after the video signal has been digitised is D1, which represents 720×576 pixels (PAL Video format). IP cameras typically provide a megapixel resolution of 1280×1024 pixels or even greater with new emerging technology providing greater detail and superior vision., and work with the NVR for data recorder.
There are two types of camera configurations, the Fixed cameras and the PTZ cameras. Fixed cameras known as the camera is mounted in a stationary position and views that same scene until physically relocated and ‘PTZ’ (pan, tilt, zoom) cameras which are motor-driven with remote control over the observation direction, focus and zoom capabilities of a camera.
Most PTZ cameras are programmed through the CCTV software to change their view at certain times (pre-set function), patrol specific areas and be integrated into alarms system inputs to focus on a particular area when alarms are activated. Although PTZ cameras have greater flexibility they are significantly more expensive than fixed cameras. Advancement in CCTV cameras now allows 360° views that can be split into, and number, individual scenes pre and post recording.
Based on the actual using environment ,the PTZ Camera are mainly installed on outdoor area where need the long distance, large area,360 degree continuous surveillance condition while the Fixed camera mainly focus on a immobile and short distance locations.
