User Manual

VIVOTEK
User's Manual - 145
Applications > Tampering detection
This section explains how to set up camera tamper detection. With tamper detection, the camera
is capable of detecting incidents such as
redirection
,
blocking or defocusing
, or even
spray
paint
.
Please follow the steps below to set up the camera tamper detection function:
1. Click to select the checkbox before tampering conditions: Tampering detection, Image too
dark, Image too bright, and Image too blurry. Enter the tamper trigger duration. (10 sec. ~ 10
min.). The duraction species the set of time before the tampering is considered as a real
alarm. This helps avoid false alarms by short-lived changes.
The tamper alarm will be triggered only when the tampering factor (the di󰀨erence between
current frame and pre-saved background) exceeds the trigger threshold. Conditions such
as image too dark, too bright, or too blurry (defocused) can also be congured as tampering
conditions. The Trigger threshold determines how sensitive your is tamper detection setting.
Lower the threshold number, easier to trigger.
Too bright: shining a flash light. The average lighting level of the scene is taken into
consideration.
Too dark: covering the objective or spraying paint.
Too blurry: blurry scene can be the result of strong interference on the device, such as EMI
interference.
2. You can configure Tampering Detection as a trigger element to the proactive event
configurations in
Event -> Event settings -> Trigger.
For example, when the camera is
tampered with, camera can be congured to send the pre- and post-event video clips to a
networked storage device. Please refer to page 128 for detailed information.