Label COCO Wholebody Hand Landmarks

@bleenco1 VersionLabel / Schema

Reindexes a flat [Landmark] hand list into a named Landmarks2d.Hand21 record (wrist plus four joints per finger: thumb, forefinger, middle, ring, pinky). A Maybe<Landmarks2d.Hand21> sink yields an empty result when the list is short.

How it fits

Typical backends

A hand keypoint detector's points are named, then rendered back onto the frame by visualize for an annotated hand overlay.

Named finger joints drive a gesture or sign classifier that addresses individual fingertips and knuckles by field.

Caveats

Hard constraintWhen connected to a Landmarks2d.Hand21 consumer the incoming input list must carry at least 21 points; a shorter list is a hard contract breach that stops the deployment. Connect a Maybe<Landmarks2d.Hand21> consumer instead to tolerate short lists: a valid list yields the record and a short list yields an empty result, and every input always produces exactly one output.
OrderingJoints are bound strictly by position (0 is the wrist, then four points per finger from thumb to pinky). A list in any other order runs without error but names the wrong points.
I/O contractOnly the first 21 points are consumed; entries beyond index 20 on input are dropped silently.
LimitationPure relabeling with no smoothing or handedness inference; coordinates and confidence pass through unchanged.

Versions

11911e88latestdefault
Automated release
6/25/2026