The Directional Crossing rule will trigger when an object is moving in a certain direction over a zone. This rule differs from the Direction rule because it was designed to reduce false alarms, common in cases of simple line crossing. The Directional Crossing rule is designed for use with a zone rather than a line and adds a series of additional checks to an object as it enters and leaves that zone.
For an object to trigger the Directional Crossing rule it must:
•Enter the zone by traveling in a direction that is within the acceptance angle.
•Be classified as one of the specified object classes.
•Exit this zone by traveling in a direction that is within the acceptance angle.
When selecting this rule we will have the following settings in the right-hand panel:
•Name: Filter name.
•Can trigger events: Mark this filter with the possibility of triggering events;
•Zone: Zone to which this filter is associated;
•Direction: Direction of movement (in degrees). The direction can be configured with the help of the graphical interface, simply clicking and dragging the larger arrow:
•Acceptance Angle: Movement acceptance angle (for diagonal movements) in degrees. This angle can be configured with the help of the graphical interface, simply clicking and dragging on the smaller indicators:
•Classes: Which classes will be considered for triggering the event. Object classes will be displayed according to the Object Tracker type selected in Advanced Options. Each tracker type will present a different list of supported object types.
•Confidence Threshold (In percentage): Specify the minimum confidence for object class recognition (For Deep Learning type trackers).
•Event Actions: Desired event actions when this rule is triggered. To learn more about event actions see chapter How to configure event actions.