gray op• 資料種類:voxel → voxel
• 呼叫: import fullseye as fs; fs.ledger.vol_equalize(vol, nbins=256, mask=None)(要直接呼叫實作,import volgray; volgray.vol_equalize(vol, nbins=256, mask=None);從台帳取用則 ops3d.get("vol_equalize"))
體的直方圖均衡(HALCON `equ_histo_image`)。
> 以下的詳細說明為原文 —— 摘要與標題已翻譯。
Builds an *nbins*-bin histogram over the volume's `[min, max]` range,
takes its cumulative distribution as a monotone LUT, and maps every voxel
through it — the output lives in `(0, 1]` and its histogram is
(approximately) flat. With *mask* (thresholded at `> 0.5`, the volops
convention) the **histogram is computed from the masked voxels only while
the LUT is applied to the whole volume** — exactly the HALCON
`reduce_domain + equ_histo_image` domain behaviour, and the right
tool when a dominant background (e.g. air around a CT subject) would
otherwise swallow the whole dynamic range.
A constant volume is returned unchanged — normalising a flat volume
would amplify floating-point dust into full-scale garbage (fail-honest,
not fail-loud; see the module docstring).
Parameters
----------
vol : array_like, shape (D, H, W)
Input volume (coerced to float64; NaN/Inf rejected).
nbins : int
Histogram bins, `>= 2`. More bins = finer LUT (the mapping is
piecewise-constant per bin — an approximation, documented above).
mask : array_like, shape (D, H, W), optional
Histogram domain. Must match *vol*'s shape and select at least one
voxel (an empty domain has no histogram — fail-closed).
Returns
-------
ndarray, shape (D, H, W), float64
The equalised volume in `[0, 1]` (constant input: the input itself).
Raises
------
ValueError
Non-3-D / non-finite input, `nbins < 2`, a mask shape mismatch, or
an empty mask.
• 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。
• gray_window_level — py -3.11 examples_3d/gray_window_level.py
voxel 作為輸入)voxel_to_mips · voxel_to_mesh · signed_distance_field · to_points · sobel3d · hessian3d · curvature_maps · edt_jfa
gray)vol_window_level · vol_gamma · vol_stretch
*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.