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b. Tampering Detection
When the camera view is covered, moved, hit by strong light, or out
of focus, the tampering detection will be triggered, and send
snapshot or video to mail/FTP/Samba/SD card, or trigger the
external alarm. For example:
• Interval: The tampering detecting interval. Take the diagram
below as example. The interval is set for 30 second; the camera
lens is covered during 10 - 40 sec. At time point B, the camera
compares the view with time point A, and sends an alarm when it
founds that the lens is covered. At time point C, the camera
compares the view with time point B, and sends an alarm when it
founds that the lens is uncovered.
c. Face Detection