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Detection of camera tampering is achieved by measuring the differences between the older frames of video
(which are stored in buffers) and more recent frames.
Tampering Alarm :
You will be able to turn the Tampering Alarm function on/off in the Tampering Alarm setting section. The default
setting is: Off.
Tampering Duration :
The Minimum Tampering Duration is the time the video analysis will need to determine whether any camera
tampering has occurred. Defining the Minimum Duration can also be interpreted as defining the Tampering
threshold; longer duration represents a higher threshold. The settable Tampering Duration time range is from 10
to 3600 seconds.
Triggered Action (Multi-option) :
The Administrator can specify alarm actions that will take place when tampering is detected. All options are
listed as follows:
- Enable Alarm Output:
Check this item and select the predefined type of alarm output to enable alarm relay output when tampering is
detected.
- Record Stream to SD Card:
When you check this item, the alarm-triggered recording will be stored on your Micro SD/SDHC card when
tampering is detected.
The pre-trigger buffer recording function allows users to check what happened to trigger the alarm. The pre-
trigger buffer time range is from 1 to 3 seconds.
Select <Upload for __ sec> to set the recording duration after the alarm is triggered. The setting range is from 1
to 99999 seconds.
Select <Upload while trigger is active> to record the triggered video until the trigger is turned off.
NOTE: Please make sure that the local recording (with Micro SD/ SDHC card) is activated so that this function can
be implemented. See section 9.10. 'Recording (on Camera)' for further details.
- Send Message by FTP:
The Administrator can select whether to send an alarm message by FTP when tampering is detected.
- Send Message by E-Mail:
The Administrator can choose to send an alarm message by E-Mail when tampering is detected.
- Upload Image by FTP:
After selecting this item, the Administrator can assign a FTP site and configure various parameters as shown in
the figure below. When tampering is detected, event images will be uploaded to the appointed FTP site.
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