sh_descriptor — 3D describe op

• Data kinds: voxel → descriptor

• Call: import match3d; match3d.sh_descriptor(vol, L=8, nradii=12, ntheta=32, nphi=64, device='cpu') (or ops3d.get("sh_descriptor"))

• GPU: this op has a GPU path (device="cuda")

Usage

The spherical-harmonic descriptor. Returns the SH band energy ‖f_l(r)‖ of concentric shells as (radius × frequency).

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)

• sh_descriptor_retrieval — py -3.11 examples_3d/sh_descriptor_retrieval.py

• shape_descriptor — py -3.11 examples_3d/shape_descriptor.py

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

fuse_to_voxel · shape_distance

Same category (describe)

match_sh_descriptor

*Provenance: match3d.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.