The Line Crossing rule generates an event when a target crosses a virtual line you draw on the scene. You can configure the line to trigger on a specific direction of travel, or in either direction. It applies to people, two-wheeled vehicles (bicycle, motorcycle), and vehicles (car, van, bus, truck). Typical uses include perimeter and boundary protection, detecting entry into a restricted zone, wrong-way movement, and directional counting of people or traffic.

IRIS+ detects, classifies, and tracks each target as it moves through the scene. When the tracked target's path crosses the line in the direction you have configured, the rule generates an event with a short clip and a bounding box around the target that crossed. Because detection depends on tracking the target up to the moment it crosses, the target needs to be visible and tracked before it reaches the line. In very congested scenes, or where an object only appears after it has already crossed, the crossing may not be captured. Line Crossing can be combined with additional filters: