algorithms

Access control has a persistent weakness: the credential is checked, not the person. A card gets borrowed, a PIN gets shared, a tailgater walks in behind a legitimate employee, and the log records an entry by someone who was never in the building. Cameras at the door record all of it, and nobody reviews any…

A fence is a statement of intent, not a barrier. The intruder who respects it was never your problem; the one who treats it as a ladder is. What makes climbing hard to catch is its shape — a hand on the coping, a scramble, a drop on the far side, all over in four…

Most false alarms come from one root cause: your system detects that pixels changed, not that something happened. Light, rain, insects and animals all change pixels. Fix it in three passes — clean up what the camera sees, add object classification so the system knows what it saw, then tune against recorded footage instead of…

Most monitoring rules fire when something appears. This one fires when something is missing, and that inversion turns out to be useful in more places than you would expect. Eight vans are supposed to be on the apron at 05:30; there are five. Three trucks should be standing at the loading dock during the shift;…

The delivery that could not be unloaded, the ambulance that could not get through, the fire lane that has been a staff car park for months — one failure in different clothes. Illegal parking detection addresses it where it is cheap to fix: the first ninety seconds after a vehicle stops where it should not….

A tanker with a placard on the side is legal on the public road and illegal in your loading yard, and the two facts are separated by about forty metres of driveway and one distracted gate guard. That gap is where hazmat vehicle access control earns its place. The rule is simple to state —…

An intrusion rule answers “is there someone in this area”. A line rule answers a sharper question: “did they cross, and which way did they go”. That direction is often the whole value — a person moving from the public pavement into your yard is a very different event from a person leaving it, and…

The shift began with three people on the line and ended with one. Nobody decided that; it happened through a phone call, a bathroom break and a materials run, and for forty minutes a station that required continuous supervision ran unattended. Workstation abandonment detection exists for exactly that gap — the one that opens quietly,…

Every perimeter system ever installed has eventually been defeated by something small and furry, or by a hedge in wind. That is the honest starting point for any discussion about perimeter intrusion detection: the technology works, but only when the zone, the schedule and the object filter are configured for the specific fence line in…