User manual

42
AXIS 241QA/AXIS 241SA - Event configuration
Camera tampering
The camera tampering application generates an alarm whenever the camera is
repositioned, or when the lens is covered, sprayed, or severely defocused.
You must also create an event, (see How to s
et up a triggered event, on page 40) for the
camera to send an alarm.
Settings
The Minimum duration parameter sets the minimum tampering period,
that is an alarm
will not be triggered until this period has lapsed, even if the tampering conditions are
otherwise met. This can help prevent false alarms for known conditions that affect the
image.
If the camera lens is sprayed or covered so that
the camera’s live view becomes dark, it will
not be possible to distinguish this situation from other situations where the same effect is
seen, such as when lighting conditions change.
When the Alarm for dark images parameter
is enabled, alarms are generated for all cases
where the lights are either dimmed or turned off, or if the lens is sprayed, covered, or
severely defocused. If not enabled, no alarm is sent.
After you define these settings, click Save.