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"))
Per-component quantitative descriptors from a label volume.
*labels* is the int volume returned by vol_label (or any integer labelling; voxels <= 0 are background). Pass *spacing* (sz, sy, sx) (or
a 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).
• measurement_uncertainty — Measurement uncertainty and calibration — what it takes to claim you are measuring
• 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.
• vessel_metrology — py -3.11 examples_3d/vessel_metrology.py
table as input)fuse_to_voxel · mesh_select_lod
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).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.