boundary op• Datenarten: voxel → points
• Aufruf: import fullseye as fs; fs.ledger.vol_boundary_points(vol_binary, spacing=None, connectivity=6, origin=(0, 0, 0)) (die Implementierung direkt: import volops; volops.vol_boundary_points(vol_binary, spacing=None, connectivity=6, origin=(0, 0, 0)); aus dem Register: ops3d.get("vol_boundary_points"))
Die Randschale als `(N, 3)-Punktwolke in (z, y, x)`-Reihenfolge.
> Die ausführliche Beschreibung unten ist der Originaltext — Zusammenfassung und Überschriften sind übersetzt.
The bridge from the voxel world to the point-cloud world at minimal memory:
only the *surface* voxels of the mask become points (inner boundary, see
:func:vol_boundary), so a solid object of a million voxels typically
yields a few tens of thousands of points — ready for `fit_sphere3` /
`smallest_box3 / register_fpfh` and friends without ever materialising
the full grid as points.
Coordinates are `(index + origin) * spacing` per axis: pass *spacing*
`(sz, sy, sx) (or a :class:volio.VolumeMeta`) for physical millimetre
coordinates, and pass the offset returned by :func:vol_crop_domain as
*origin* so points from a cropped volume land in the uncropped frame
(*origin* is in voxel units — it is added to the index *before* the
spacing multiply; it must be finite, and may be fractional for a subvoxel
shift). An empty mask returns an empty `(0, 3)` array (a valid question
with a valid empty answer — unlike a crop, which needs a box to exist).
Returns an `(N, 3)` float64 array, rows ordered z-major (deterministic).
• Katalog der Beispieldaten (Download-URLs / Lizenzen) — 2-D nutzt skimage.data (BSD/Public Domain) plus synthetische Bilder, 3-D nennt Download-URLs echter Datenquellen (Stanford, PDS, …).
• Herkunft und Literatur der Operatoren — die Quellen der Forschung/Verfahren, auf denen diese Operatorfamilie beruht.
• roi_domain_boundary — py -3.11 examples_3d/roi_domain_boundary.py
points als Eingabe)points_to_voxel · gaussians_to_voxel · estimate_point_normals · to_points · match_points_ncc · match_pca · moment_axes · icp_point2point_3d
boundary)*Provenance: volops.py — 3D Operator-Registry. Diese Notiz wird von tools/opdocs.py md erzeugt (nicht von Hand bearbeiten).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.