probe op• Data kinds: voxel → signal
• Call: import fullseye as fs; fs.ledger.vol_wall_thickness(vol, p0, p1, sigma=1.0, threshold=0.1, spacing=None) (to call the implementation directly, import volprobe; volprobe.vol_wall_thickness(vol, p0, p1, sigma=1.0, threshold=0.1, spacing=None); from the registry, ops3d.get("vol_wall_thickness"))
• Return value through the ledger: fullseye.ledger.vol_wall_thickness(...) returns **only the declared out type signal** (the underlying function also returns auxiliary values). When you need what was dropped, use fullseye.ledger.vol_wall_thickness.raw(...) or call volprobe.vol_wall_thickness directly.
Wall thicknesses along the probe `p0 -> p1` — the industrial-CT
measurement itself.
Runs :func:vol_edge_probe (all polarities) and pairs consecutive
opposite-polarity edges *rising -> falling* in probe order: each pair is
one traversal of bright material (entry surface -> exit surface), and its
thickness is the difference of the two edges' `t_mm` (physical units —
mm with a spacing, voxels without). A probe crossing both walls of a pipe
therefore yields two thicknesses.
Edges that do not complete a rising -> falling pair (a probe starting or
ending inside material, consecutive same-polarity edges) are ignored,
not paired creatively — the count of returned thicknesses can be smaller
than `len(edges) // 2`. Dark walls on a bright background need an
inverted volume (the pairing convention is bright material).
Returns a list of float thicknesses, in probe order (possibly empty).
Raises `ValueError` on the same malformed inputs as
:func:vol_edge_probe.
• 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.
• wall_thickness_probe — py -3.11 examples_3d/wall_thickness_probe.py
signal as input)probe)vol_profile_line · vol_edge_probe
*Provenance: volprobe.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.