vol_gamma — 3D gray op

• データ種: voxel → voxel

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

使い方

Gamma (power-law) correction on the volume's own range (HALCON `pow_image`).

Normalises `[min, max] to [0, 1], applies t**gamma`, and maps the

result back to the original `[min, max]` — so the volume's extremes are

fixed points and only the mid-tones move: `gamma > 1` darkens them,

`gamma < 1 brightens them, gamma == 1` is the identity. The transform

is strictly monotone, so intensity *ordering* is always preserved.

A constant volume is returned unchanged (no range to normalise —

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

Parameters

----------

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

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

gamma : float

Exponent, `> 0 (fail-closed: gamma <= 0` is not a monotone

intensity map).

Returns

-------

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

The gamma-corrected volume, same `[min, max]` range as the input.

Raises

------

ValueError

Non-3-D / non-finite input, or `gamma <= 0`.

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_stretch

*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.