Detect Object Containment

@bleenco1 VersionDetect

Polygon containment gate for Rectangle<Double>; emits Bool true when the anchor point (foot or centre, per anchor_mode) lies strictly inside the polygon defined in roi. Fast single-bbox in-zone check with no ML model.

How it fits

Typical backends

Single-zone person counter.

Restricted-area alarm.

Tracker-driven containment gate.

Caveats

LimitationThe component takes a SINGLE rectangle per call; for lists of detections fan out upstream.
Limitationroi must be defined at deploy time; rotating the ROI requires a redeploy.
I/O contractContainment uses a strict point-in-polygon test; a point exactly on the edge counts as OUTSIDE.
Accuracyroi vertices are stored as integer pixels internally; sub-pixel coordinates round at load time.
Hard constraintanchor_mode must be exactly `center` or `bottom`; any other value aborts startup.
Hard constraintAn empty roi aborts startup with an error.
LimitationBoth config keys are cached at first invocation; runtime changes have no effect.

Versions

31764fc1latestdefault
Automated release
6/21/2026