Installation guide

Configuration and Operation
65
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
The tampering alarm function may be turned on or off in the Tampering Alarm page. The default
setting is Off.
By Schedule
To set a schedule:
1. Select By schedule.
2. Click Please Select. A drop-down menu opens.
3. From the drop-down menu, select a schedule from 1 to 10.
For instructions how to set a schedule, refer to Schedule.
Tampering Duration
Minimum tampering duration is the time for video analysis to determine whether camera tampering
has occurred. Minimum duration could also be interpreted as defining the tampering threshold; a
longer duration represents a higher threshold. The tampering duration time range is from 10 to 3600
seconds.
Triggered Action
The Administrator can specify multiple alarm actions to be taken when tampering is detected. All
options are listed as follows:
 Enable alarm output – Check this box and select the predefined type of alarm output
(high or low) to enable alarm relay when tampering is detected.
 Record stream to sd card – Select this box in order to save the alarm-triggered recording
into a microSD/SDHC card. Enter the number of seconds for the pre-trigger buffer. Select
the first radial button to upload for a specified length of time and enter the number of
seconds. Alternatively, select the second radial button to upload during the active trigger.
See Figure 53: Application – Record Stream to SD Card.
Note:
Make sure the local recording (with a microSD/SDHC card) is activated
so that this function can be implemented. See Recording for further
details.
 Send Alarm Message by FTP/E-Mail – The Administrator can select whether to send an
alarm message by FTP and/or E-Mail when tampering is detected.
 Upload Image by FTP – Selecting this option enables you to assign an FTP site and
configure various parameters, as shown in Figure 54: Application – Upload Image by FTP.
When tampering is detected, event images will be uploaded to the designated FTP site.
Specify the FTP address to use from the drop-down menu. Select the number of frames
for the pre-trigger and post-trigger buffers from the drop-down menu of 1-20 frames.
Check the box for Continue image upload if you wish to use this option. To specify the
length of time for the upload, click on this radial button and enter the number of
seconds. To upload during the active trigger, click on this radial button.
Finally, select the number of frames per second from the drop-down menu next to Image
frequency.