User's Manual

 Keep the lines as close to the center of the image as possible, and make sure the target is
visible for longer than 0.5 seconds before reaching the line. The target should be present
in the image for no less than two (2) consecutive seconds, and the moving distance
should be larger than its width and no less than 15 pixels (CIF image) at the same time. If
the target has already crossed the rulers even before they appear in the image
completely, the detection will fail.
 Try to avoid scenes with:
obstacles, such as trees and buildings that might obscure the target as it moves
through the scene.
reflective surfaces, such as glass, bright ground cover or water.
shadows and direct light exposure or with drastic changes in lighting.
multiple targets moving through the scene at a given time.
6.2.2 Tripwire
The Tripwire function issues an alarm when a target crosses a defined line. Use the following
information to create a tripwire rule: