geom_transform op• データ種: voxel → voxel
• 呼び出し: import fullseye as fs; fs.ledger.vol_resize(vol, factor=None, shape=None, order=1, spacing=None, mode='nearest', cval=0.0) (実装を直接呼ぶなら import volxform; volxform.vol_resize(vol, factor=None, shape=None, order=1, spacing=None, mode='nearest', cval=0.0)、台帳から引くなら ops3d.get("vol_resize"))
• 台帳経由の戻り値: fullseye.ledger.vol_resize(...) は**宣言 out 型 voxel の値だけ**を返す(本体は補助情報も返す)。捨てられた側が要るときは fullseye.ledger.vol_resize.raw(...)、または volxform.vol_resize を直接呼ぶ。
• 本体の返り: spacing 付き時
ボリュームを新しい格子へ再標本化する(`scipy.ndimage.zoom`、セル意味論)。
> 以下の詳細説明は原文のままです —— 要約と見出しは訳出済み。
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).
• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• vol_geometry_transform — py -3.11 examples_3d/vol_geometry_transform.py
voxel を入力に取れる)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. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.