vol_boundary — 3D boundary op

Datenarten: voxelvoxel

Aufruf: import fullseye as fs; fs.ledger.vol_boundary(vol_binary, connectivity=6, side='inner') (die Implementierung direkt: import volops; volops.vol_boundary(vol_binary, connectivity=6, side='inner'); aus dem Register: ops3d.get("vol_boundary"))

Verwendung

Randschale eines Binärvolumens (das 3-D-`region_boundary`).

> Die ausführliche Beschreibung unten ist der Originaltext — Zusammenfassung und Überschriften sind übersetzt.

`side='inner'` keeps the foreground voxels that touch background:

`mask & ~erode(mask). side='outer'` keeps the background voxels that

touch foreground: `dilate(mask) & ~mask`. *connectivity* (6/18/26) decides

which neighbours count as "touching" — 6 uses face neighbours only (the

thinnest shell); 26 also counts a diagonal background contact, so shells at

convex corners come out thicker. The volume border counts as background

for the *inner* shell (a mask reaching the border has a boundary there —

the same convention as the surface-area estimate in

:func:vol_region_props); the *outer* shell can only occupy voxels that

exist, so a mask filling the whole volume has an empty outer boundary.

A solid region's interior drops out entirely: the shell of a solid ball of

radius `r voxels is roughly a 3/r` fraction of it (surface over

volume), so the saving grows with size — which is exactly why boundary

representations (and :func:vol_boundary_points) are the memory-frugal way

to hand a shape to the point-cloud / metrology operators.

Returns a `(D, H, W) float64 {0, 1}` volume (chainable into

:func:vol_label, :func:vol_boundary_points, ...).

Referenzen (Beispieldaten, Literatur)

• 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.

Ausführbare Beispiele (verifizierte Samples, die diesen Operator wirklich aufrufen)

roi_domain_boundarypy -3.11 examples_3d/roi_domain_boundary.py

Typkompatible Folge-Operatoren (nehmen voxel als Eingabe)

voxel_to_mips · voxel_to_mesh · signed_distance_field · to_points · sobel3d · hessian3d · curvature_maps · edt_jfa

Gleiche Kategorie (boundary)

vol_boundary_points


*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.