Threshold: Time, in seconds, that the target must remain within the detection zone to generate an alert.
Sensitivity: Inverse of the percentage of the target area entering the detection zone, relative to the total target area, to generate an alert. The formula that describes this concept is A/A+B>100-S, where A is the target area within the zone, B is the target area outside the zone and S is the sensitivity. A value of 80 will only trigger the alert when at least 20% of the target enters the area.
Percentage: Minimum area (in percentage) of the detection zone that has to be occupied to generate an alert.
Follow a guide in English for installation and configuration of VCA rules