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Glossary
The terms an evaluation actually turns on
In short
Video analytics has a vocabulary that hides a lot of detail. Pixel-on-target decides whether a camera can work at all; false alerts per camera-hour is the honest way to express alert quality; occupancy drift explains why a dashboard number stops being trustworthy by mid-afternoon. These are the definitions this site uses.
- Pixel on target
- The number of image pixels occupied by the object of interest at the furthest point a rule must work. It is the single strongest predictor of whether a camera can support a people- or vehicle-based analytic, and is measured rather than estimated by eye. Read more →
- Event stabilisation
- The set of mechanisms — track continuity, persistence windows, size and direction filters, schedules and cooldowns — that reduce irrelevant and duplicate alerts before an event is created. It reduces false alerts; it does not eliminate them. Read more →
- Persistence window
- How long a tracked object must satisfy a rule before an event is raised. It discards momentary detections caused by a bird, a shadow edge or a compression artefact, at the cost of a small delay. Read more →
- Cooldown
- A period after an event during which the same rule and track will not raise another event, preventing a single sustained presence from generating a continuous alert stream.
- Dwell time
- The continuous time a tracked object spends inside a defined zone. Reported as a distribution rather than a single average, because an average hides the difference between many brief passes and a few long stops. Read more →
- Density band
- A calibrated range describing how densely people occupy a region, used instead of a headcount because individuals occlude each other in a crowd precisely when the information matters most. Read more →
- Directional counting
- Counting objects that cross a virtual line, attributed to a direction of travel, which produces separate entry and exit totals rather than a single crossing count. Read more →
- Occupancy drift
- The accumulating error in a derived occupancy figure between scheduled resets, caused by counting error at doorways and by any unmonitored route into or out of the space. Read more →
- Camera readiness review
- A per-camera assessment that classifies each view as suitable, suitable after re-aiming, or unsuitable for a specific intended rule, carried out before any commitment to a rollout.
- Ground truth
- Independently established fact against which analytics output is compared during a pilot — scripted walk tests, manual counts or stopwatch timing — rather than the system’s own confidence scores. Read more →
- False alerts per camera-hour
- The count of alerts an operator marks as irrelevant, divided by camera-hours observed. It is the honest way to express alert quality, because it scales with deployment size in a way that a percentage does not.
- Edge processing
- Running analytics on hardware at the site, next to the cameras, so continuous video stays local and detection continues during a WAN outage. Read more →
- Air-gapped deployment
- A deployment inside an isolated network with no outbound connectivity, where licensing, updates and diagnostics move through a controlled offline process. Read more →
- VMS (video management system)
- The platform that records, stores and presents camera video to operators. Analytics integrates with it so events reach operators in the console they already use rather than in a second one. Read more →
- ONVIF
- An interoperability specification for IP cameras covering discovery, streaming and, in some profiles, metadata. Conformance describes which interfaces a device implements; it says nothing about whether a camera is positioned well enough for a given analytic. Read more →
- ANPR
- Automatic number plate recognition: reading a vehicle licence plate from a camera view and converting it to text. Read rate depends heavily on camera angle, shutter speed, illumination, plate condition and country format. Read more →
- Opportunity to see
- A count of people positioned where they could have seen a display, measured by presence and dwell within a viewing zone. It measures opportunity, not attention — proximity does not establish that anyone looked. Read more →
- WebMCP
- A browser API that lets a web page expose structured tools to an AI agent acting on the user’s behalf. On this site it exposes read-only information tools directly, and gates any action behind an explicit two-stage confirmation. Read more →