geom_transform op• Data kinds: voxel → voxel
• Call: import fullseye as fs; fs.ledger.vol_resize(vol, factor=None, shape=None, order=1, spacing=None, mode='nearest', cval=0.0) (to call the implementation directly, import volxform; volxform.vol_resize(vol, factor=None, shape=None, order=1, spacing=None, mode='nearest', cval=0.0); from the registry, ops3d.get("vol_resize"))
• Return value through the ledger: fullseye.ledger.vol_resize(...) returns **only the declared out type voxel** (the underlying function also returns auxiliary values). When you need what was dropped, use fullseye.ledger.vol_resize.raw(...) or call volxform.vol_resize directly.
• Underlying return: spacing 付き時
Resample a volume to a new grid (`scipy.ndimage.zoom`, cell semantics).
Exactly one of *factor* / *shape* selects the target grid:
• `factor — a positive scalar or (fz, fy, fx)`; the output shape is
`round(dim * f) per axis (scipy's rule, each >= 1`).
• `shape — the exact output (D', H', W')` (positive integers).
Sampling uses `grid_mode=True` (cell semantics): a voxel is a *cell*, so
an integer upscale `f maps input voxel i` exactly onto the output
block `[f*i, f*(i+1)) (exact at order=0`), and the volume's physical
extent is preserved by the recomputed spacing — not the endpoint-aligned
convention of scipy's `grid_mode=False` default.
*mode* / *cval* set how samples that fall outside the input cells (the outer
half-voxel shell of every upscale at `order >= 1`) are filled. The default
`"nearest"` extends the border voxel, so **a constant volume resizes to
the same constant** and a ramp keeps its end values. Until 2026-09-03 the
call was hard-wired to `"grid-constant" with cval=0`, which blended
the outer shell toward 0 — an upscale x2 of an all-ones volume came back
with `min = 0.42` on its faces, an artefact that then leaked into every
downstream measurement. Other accepted modes: `"reflect", "mirror"`,
`"grid-mirror", "grid-wrap", and "grid-constant"` (with *cval*)
when a zero-padded border is genuinely wanted. `"constant" / "wrap"`
are rejected with a hint (scipy needs the `grid-` variants here).
The return shape depends on *spacing*:
• `spacing=None (default) — returns the resampled (D', H', W')`
float64 volume alone.
• *spacing* given (`(sz, sy, sx) or a VolumeMeta`) — returns a
2-tuple `(out, new_spacing)` where
`new_spacing = (sz * D/D', sy * H/H', sx * W/W')`, so
`out.shape * new_spacing == vol.shape * spacing` per axis: the physical
size in millimetres is invariant. Keep the new spacing — every
spacing-aware operator downstream needs it.
*order* is the spline degree (exact integer 0..5; 0 = nearest — the choice
for masks / labels, 1 = trilinear — the grey-value default; >1 can
overshoot, see the module notes). Shrinking aliases (no band-limiting) —
mean-pool with :func:volops.volume_downsample first for large reductions.
Raises `ValueError` when both or neither of *factor* / *shape* are given,
or when the output would exceed `MAX_VOXELS` (checked before any
allocation — a huge factor cannot balloon memory).
• 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.
• vol_geometry_transform — py -3.11 examples_3d/vol_geometry_transform.py
voxel as input)voxel_to_mips · voxel_to_mesh · signed_distance_field · to_points · sobel3d · hessian3d · curvature_maps · edt_jfa
geom_transform)*Provenance: volxform.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.