vol_stretch — 3D gray op

• データ種: voxel → voxel

• 呼び出し: import fullseye as fs; fs.ledger.vol_stretch(vol, p_low=1.0, p_high=99.0) (実装を直接呼ぶなら import volgray; volgray.vol_stretch(vol, p_low=1.0, p_high=99.0)、台帳から引くなら ops3d.get("vol_stretch"))

使い方

Percentile contrast stretch to `[0, 1] (robust scale_image_max`).

Computes the *p_low*-th and *p_high*-th intensity percentiles and maps

`[P(p_low), P(p_high)] linearly onto [0, 1]`, clipping outside — so a

handful of hot/cold outlier voxels (a metal artefact, a dead detector

element) no longer dictates the display range, unlike a plain min/max

normalisation. The defaults (1 % / 99 %) are the usual display-stretch

choice.

If the two percentile values coincide (a constant — or near-constant —

volume), the input is returned unchanged rather than divided by zero

(see the module docstring's flat-volume note).

Parameters

----------

vol : array_like, shape (D, H, W)

Input volume (coerced to float64; NaN/Inf rejected).

p_low, p_high : float

Percentiles in `[0, 100] with p_low < p_high` (fail-closed).

Returns

-------

ndarray, shape (D, H, W), float64

The stretched volume in `[0, 1]` (degenerate percentiles: the input

itself).

Raises

------

ValueError

Non-3-D / non-finite input, percentiles out of `[0, 100]`, or

`p_low >= p_high`.

参考(サンプルデータ・文献)

• 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。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• gray_window_level — py -3.11 examples_3d/gray_window_level.py

型が繋がる次の op(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

同カテゴリ(gray)

vol_window_level · vol_equalize · vol_gamma

*Provenance: volgray.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.