vol_affine — 3D geom_transform op

• 資料種類:voxel → voxel

• 呼叫: import fullseye as fs; fs.ledger.vol_affine(vol, matrix, offset=(0, 0, 0), order=1, output_shape=None, mode='constant', cval=0.0)(要直接呼叫實作,import volxform; volxform.vol_affine(vol, matrix, offset=(0, 0, 0), order=1, output_shape=None, mode='constant', cval=0.0);從台帳取用則 ops3d.get("vol_affine"))

用法

通用仿射重取樣(`scipy.ndimage.affine_transform`)。

> 以下的詳細說明為原文 —— 摘要與標題已翻譯。

Convention (pinned — read this before writing a matrix): this is

scipy's pull (output -> input) resampler. For every output voxel at

integer coordinate `o = (z, y, x)` the result is the input interpolated

at `matrix @ o + offset`::

out[o] = vol[ matrix @ o + offset ] # (z, y, x) order, voxels

Consequences: `matrix = 2*I` makes the object appear half size (each

output step strides two input voxels); `offset = (1, 2, 3)` moves the

object by `(-1, -2, -3)`. To *push* content through a forward transform

`T (the pose from a registration), pass the **inverse** of T`. The

test suite machine-pins this direction.

*matrix* is either a `(3, 3)` linear part (with *offset* a separate

length-3 translation) or a `(4, 4)` homogeneous matrix

`[[A, t], [0, 0, 0, 1]] — then A / t` are taken from the matrix,

the bottom row must be exactly `(0, 0, 0, 1)`, and *offset* must stay at

its zero default (a second translation would be ambiguous). Any other

shape raises `ValueError`.

*output_shape* defaults to the input shape; an explicit one is cap-checked

against `MAX_VOXELS` before allocation. *order* is the spline degree

(exact integer 0..5). Voxels whose source coordinate falls outside the

input are filled per *mode*/*cval*.

Returns a float64 volume of *output_shape*.

參考(範例資料・文獻)

• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。

• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。

可執行的範例(實際呼叫該運算子並已驗證的樣例)

• vol_geometry_transform — py -3.11 examples_3d/vol_geometry_transform.py

型別可銜接的下一個運算子(可接受 voxel 作為輸入)

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

同類別(geom_transform)

vol_resize · vol_rotate

*Provenance: volxform.py — 3D 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.