principal_moments — 3D moment_invariant op

• Data kinds: points → descriptor

• Call: import moments3d; moments3d.principal_moments(points) -> 'np.ndarray' (or ops3d.get("principal_moments"))

Usage

The eigenvalues of the inertia tensor (the principal moments, sorted descending, rotation invariant).

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

Runnable examples (verified samples that actually call this op)

• shape_desc_pose — py -3.11 examples_3d/shape_desc_pose.py

Ops the type connects to (they accept descriptor as input)

fuse_to_voxel · shape_distance

Same category (moment_invariant)

moment_invariants · central_moments · inertia_tensor

*Provenance: moments3d.py — 3D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.