Activity Detection
A facility where the amount of movement within programmable areas of a camera picture is constantly measured. If the amount of movement in the sensitive areas exceeds a preset value, this can trigger action such as increased recording rate or sounding an alert buzzer.
Advanced Activity Search
The facility to retrospectively search the video recording for when movement has occurred in selected areas of the picture. This does not require activity detection or video motion detection to the active at the time of the recording.
Alarm Reporting
The facility to notify events such as alarm detection or camera failure to a remote monitoring centre.
Alarm Zones
See 'Zoned Alarms'
Alarming
Feature on some CCTV equipment which allows the equipment to provide a simple switch closure (usually) in response to a designated input alarm signal.
Analytics
Software used in conjunction with a DVR, video server or edge device such as a camera to perform analysis of a scene, typically as a live analysis where the analytics is reviewing events as and when they occur, raising alarms to the operator if necessary. Analytics can be activities such as monitoring for removal of an object, perimeter/tripwire detection and people counting. The use of ANPR is also categorised as a form of analytics, as is more traditional forms of video analysis such as Video Motion Detection (VMD).
ANPR
Automatic Number Plate Recognition (ANPR) is a form of video analytics that captures, and stores vehicle license plates from a specialised ANPR Camera.
Aperture Opening (Lens)
Controls the amount of light reaching the surface of the camera pick-up device. Aperture size is controlled by the iris. Increasing the f-stop decreases the amount of light reaching the pick-up device.
Aspect Ratio
Ratio of picture height to picture width. Standard ratio is 4:3.
Attenuation
A decrease in signal strength.
Audio
The use of sound to provide added functionality e.g. listening in to sounds on a remote site or passing audible warnings to trespassers at a camera location.
Auto Iris Lens
Camera lens which automatically adjust for proper light levels
Auto Pan
Automatic back and forth camera motion
Auto Scan
Same as Auto Pan
Automatic Brightness Control
Electronic circuitry which automatically controls the brightness of video monitors in relation to ambient light.
Automatic Frequency Control (AFC)
Circuitry that automatically maintains the desired frequency.
Automatic Gain Control (AGC)
Circuitry that automatically adjust the signal to proper strength.
Automatic Light Control
Process by which the brightness upon the camera pick-up device is automatically adjusted according to the brightness of the scene.
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