vol_region_props — 3D `regionprops` op

• Data kinds: labels → table

• Call: import fullseye as fs; fs.ledger.vol_region_props(labels, spacing=None, surface='auto') (to call the implementation directly, import volops; volops.vol_region_props(labels, spacing=None, surface='auto'); from the registry, ops3d.get("vol_region_props"))

Usage

Per-component quantitative descriptors from a label volume.

*labels* is the `int volume returned by :func:vol_label` (or any integer

labelling; voxels `<= 0 are background). Pass *spacing* (sz, sy, sx)` (or

a :class:volio.VolumeMeta) to report physical volume in mm**3 and physical

surface area in mm**2. *surface* selects the surface-area estimator:

`"auto" (marching cubes when scikit-image` is importable, else exposed

faces), `"marching" (require marching cubes), or "faces"` (always the

face count).

Returns a `list[dict] (one per label 1..n`, in ascending label order),

each with:

`label id · voxel_count · volume` (voxels, or mm**3 with spacing) ·

`centroid (z, y, x) in voxel-index coordinates · bbox`

`(z0, z1, y0, y1, x0, x1) with **exclusive** upper bounds (slice stop`) ·

`surface_area (voxel-face units, or mm**2 with spacing) · sphericity`

(Wadell, ~1 for a sphere, lower for a slab; approximate — see module note).

Background guides (the physics and conventions behind this op)

• measurement_uncertainty — 計測の不確かさと校正の知識 — 「測れている」を主張するために

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)

• vessel_metrology — py -3.11 examples_3d/vessel_metrology.py

Ops the type connects to (they accept `table` as input)

fuse_to_voxel · mesh_select_lod

Same category (`regionprops`)

label_components · region_props · largest_component · filter_by_volume · inner_box3 · vol_label

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

vol_region_props — 3D regionprops op