Behavioral Analytics (Loitering, Intrusion, Crowd, Zones) — One-Page Reference

What behavioral analytics is (geometry-and-timing rules on tracked objects, not identity), the five rules (line crossing, intrusion zone, loitering, crowd/occupancy counting, object left behind), the scene-description-then-rule-engine architecture, the false-alarm math (~285 → ~29 false alerts/day on one camera with a ~90%+ cut; well-tuned low-single-digit FP, never zero), the accuracy of each rule (line/zone most reliable; crowd counting an estimate; object-left-behind hardest, i-LIDS-grade), h