vol_stretch — 3D gray op

• 資料種類:voxel → voxel

• 呼叫: import fullseye as fs; fs.ledger.vol_stretch(vol, p_low=1.0, p_high=99.0)(要直接呼叫實作,import volgray; volgray.vol_stretch(vol, p_low=1.0, p_high=99.0);從台帳取用則 ops3d.get("vol_stretch"))

用法

按分位數把對比度拉伸到 `[0, 1](穩健版 scale_image_max`)。

> 以下的詳細說明為原文 —— 摘要與標題已翻譯。

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`.

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)

• gray_window_level — py -3.11 examples_3d/gray_window_level.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(gray)

vol_window_level · vol_equalize · vol_gamma

*Provenance: volgray.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.