Check Object Distance

@bleenco1 VersionUtility

Proximity flag for a pair of tracked objects: takes two class ids as Int64 and their separation as a Double and emits a Bool that is true when the distance is within the configured per-class-pair threshold.

How it fits

Typical backends

Compute nearest inter-object distances, flag pairs that breach a proximity threshold, and publish the boolean alerts over HTTP.

Use the proximity flag as a gate so only frames where objects are too close pass downstream.

Caveats

Hard constraintEach class pair may appear only once in distance_thresholds; a duplicated pair makes the rule ambiguous and fails startup rather than picking one threshold.
FallbackA class pair with no configured rule — including the sentinel negative class ids the upstream emits when an object had no neighbour — is reported as not-too-close rather than raising an error mid-stream.
I/O contractThe flag is true when the distance is less than or equal to the threshold, and class-pair ordering does not matter because pairs are normalized before lookup.

Versions

b0104179defaultlatest
Automated release
3/27/2026