Axis Communications AXIS 221 - Manual (Page 30)

30 AXIS 221 - Event Configuration
Please see the online help
for descriptions of each available option.
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 set up a triggered event, on page 28, for the
camera to send an alarm.
Settings
Minimum duration - This parameter sets the minimum tampering period, i.e. an alarm
will not be triggered until this period has elapsed, even if the tampering conditions are
otherwise met. This can help prevent false alarms for known conditions that affect the
image.
Alarm for dark images - If the camera lens is sprayed or covered so that the camera live
view becomes dark, it will not be possible to distinguish this situation from other situations
where the same effect is seen, i.e., when lighting conditions change.
When this paramater is enabled, alarms will be 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 will be sent.
After making these settings, click Save.