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Tamper Detection
Tamper Detection
The Tamper Detection module is intended to detect camera tampering events such as
bagging, de-focusing, moving the camera, etc. This is achieved by detecting large persistent
changes in the image.
Once enough of the image has changed and remained so for a certain length of time, a
tamper alarm is triggered.
Tamper Detection Settings
In the tamper detection settings it is possible to change the thresholds for the area of the
image which must be changed and the length of time it must be changed for before the
alarm is triggered.
Timeout before triggering alarm: The length of time that the image must be
persistently changed before the alarm is triggered.
Area change to trigger alarm: Percentage area of the image which must be changed
for tampering to be triggered.
If false alarms are a problem the duration and/or area should be increased so that large
transient changes such as a close object temporarily obscuring the camera do not cause false
alarms.
Detect lightness changes
Large fast changes to the image lighting such as switching on/off indoor lighting can cause
false tamper alarms. Enable this option if this is likely to be a problem in the area where the
camera is installed. However, this option will reduce sensitivity to genuine alarms so it is not
recommended if fast light changes are not likely to be a problem.
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