Interpret
Draw zones and lines on a camera and set times and thresholds. When a rule's condition is met it raises an event and an alert; the rule also sets how severe the alert is and how often it may repeat.
What is included
Turn movement into events with rules built from four things: geometry, time, counts and, where enabled, an AI scene reading.
Geometry
Where something happened on the camera's view.
Zone entry
A person or vehicle entering a drawn area.
Limit: An event is recorded only when a rule fires, and each firing is an alert.
Zone exit
A person or vehicle leaving a drawn area.
Limit: Verified by automated tests; not yet confirmed on a live feed in our own testing.
Line crossing
A line drawn on the image, crossed in one direction, the other, or either.
Limit: Verified by automated tests; not yet confirmed on a live feed in our own testing.
Wrong-way movement
A line crossed against the permitted direction, for vehicles or for people on foot.
Limit: Verified by automated tests; not yet confirmed on a live feed in our own testing.
Time
How long, and at what hour.
Loitering and dwell limits
A person or vehicle staying in a zone beyond the time you set.
Limit: Verified by automated tests; not yet confirmed on a live feed in our own testing.
After-hours schedules
Any rule can be limited to the hours when it matters.
Limit: A repeat limit is a time window for one rule on one camera: a continuing situation alerts again after it, and separate incidents inside it are not raised.
Repeat limits and automatic muting
A repeat limit caps how often a rule alerts on one camera, and a rule that reviewers keep marking false on a camera is muted there.
Limit: A repeat limit is a time window for one rule on one camera: a continuing situation alerts again after it, and separate incidents inside it are not raised.
Count
How many at once.
Crowd and queue thresholds
A set number of people in a camera's view. A count of who the camera can see: not a count inside a drawn zone, a calibrated density or a wait time.
Limit: A count covers the camera's whole view; it cannot be limited to a drawn zone.
Occupancy and vehicle counts
People and vehicles counted by type, by quarter-hour, hour or day.
Limit: A figure for a module that is switched off is shown as unavailable, never as zero.
Specialist models
Rules that depend on a model beyond detection.
Rules on AI scene readings
Optional moduleUses an external AI serviceA rider without a helmet, three on a two-wheeler, a person on the ground, visible fire, smoke or a weapon. Raised after the reading, not in real time.
Limit: The alert follows the reading, so it is not on the real-time path.
Events it produces
What this capability watches for.
Each event says what it needs and where it stops. The rules you set on a camera raise these events, and the alerts that go with them.
Line crossing
A person or vehicle crosses a line you draw, in the direction you choose.
- When
- A followed object crosses the line one way, the other way, or either way.
- Limit
- An object that is only partly in view near the line can be counted as crossing, or missed. A crossing inside the rule's repeat limit is not recorded.
Zone entry
A person or vehicle enters a perimeter, fence line or restricted area.
- When
- A followed object enters the drawn zone.
- Limit
- The detector looks for people and vehicles rather than motion, which reduces but does not remove false detections from animals, reflections and headlights. A badly placed zone edge can also catch passers-by.
Loitering
A person stays in an area longer than the time you set.
- When
- Time inside the zone passes the limit.
- Limit
- If a person is lost and found again, the timer can restart, so long stays may be reported late.
After-hours presence
A person or vehicle is in an area during the hours it should be empty.
- When
- Zone entry inside a scheduled window.
- Limit
- The schedule follows the clock, so authorised late work raises it unless that camera is excepted.
Wrong-way movement
A vehicle, or a person on foot, crosses a line against the permitted direction. Each rule names the object type it applies to.
- When
- A line crossed in the direction the rule forbids.
- Limit
- A vehicle reversing briefly, or a person stepping back, crosses the line the wrong way.
Crowd gathering
More people are in a camera's view at once than the number you set.
- When
- The count of people in the camera's view reaches the threshold.
- Limit
- A count of people the camera can see, not a calibrated density and not a count inside a drawn zone. People hidden behind others are not counted.
Occupancy threshold
The number of people or vehicles in a camera's view reaches the capacity you set.
- When
- The count of the chosen object type reaches the threshold.
- Limit
- It counts what one camera can see, so a space covered by several cameras needs a rule on each.
Queue too long
The number of people in the view of a camera that covers a queue area reaches the number you set.
- When
- The count of people in the camera's view reaches the threshold.
- Limit
- A count of everyone the camera can see: not a count inside a drawn queue zone, and not a wait time. Staff and passers-by in view are counted too.
Dwell limit reached
A person or vehicle stays in an area, such as a bay or a service point, beyond the time you set.
- When
- Time inside the zone passes the limit.
- Limit
- An event at the limit, not a report of how long people stay.
Vehicle stopped where it should not
A vehicle stays in a no-stopping zone, a fire lane or an emergency bay beyond the time you set.
- When
- A vehicle's time inside the zone passes the limit.
- Limit
- A vehicle held in traffic inside the zone is reported like a parked one.
Person on the ground
A scene reading describes a person lying or collapsed on the ground.
- When
- The reading of a sighting carries the person-on-ground tag.
- Limit
- It follows the reading, so it is not an immediate fall alarm. People sitting or resting can be read as on the ground.
Outcome
Events and alerts with a severity, each leading to its sighting and still where one object raised it, and each waiting for a person to review it.
Where it is used
See it working on footage like yours.
Tell us the workflow you care about. We will walk through it on demonstration footage, say what is available today, and plan a pilot on your own cameras.