probe op• Data kinds: voxel → table
• Call: import fullseye as fs; fs.ledger.vol_edge_probe(vol, p0, p1, sigma=1.0, threshold=0.1, spacing=None, polarity='all') (to call the implementation directly, import volprobe; volprobe.vol_edge_probe(vol, p0, p1, sigma=1.0, threshold=0.1, spacing=None, polarity='all'); from the registry, ops3d.get("vol_edge_probe"))
Sub-sample edges along the probe p0 -> p1.
The profile (default sampling of vol_profile_line) is smoothed with a 1-D Gaussian of sigma samples, differentiated with respect to the physical abscissa t_mm, and local extrema of the derivative magnitude are taken as edges. Each is refined to sub-sample precision by a 3-point parabolic fit; plateau twins closer than 1.5 samples are merged.
threshold is an absolute derivative amplitude in intensity per physical distance unit (per mm when spacing is given, per voxel otherwise) — edges with |d gray / d t| < threshold at the peak are discarded. It is *not* relative to the profile's own maximum: choose it for your data's intensity range and spacing.
polarity selects "positive" (rising, dark -> bright along the probe), "negative" (falling) or "all".
Returns a list of dicts ordered by distance, each::
{"t_mm": physical distance of the edge from p0,
"position": (z, y, x) interpolated voxel coordinate of the edge,
"amplitude": |d gray / d t| at the peak (intensity / distance unit),
"polarity": +1 rising, -1 falling}
Raises ValueError on the same malformed inputs as vol_profile_line, a negative / non-finite sigma or threshold, or an unknown polarity.
• 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
table as input)fuse_to_voxel · mesh_select_lod
probe)vol_profile_line · vol_wall_thickness
*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.