fullseye

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

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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.

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