3d op• Data kinds: volume → volume
• Call: fullseye.apply(img, "vol_gaussian", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
*The figure is the actual output on a synthetic 128×128 input. Left: input, right: output. Point clouds are drawn as a top-down scatter (brightness = z), 1-D series as a line plot, volumes as the maximum-intensity projection along z, videos as the middle frame, complex images as magnitude; return values that are not pictures are shown as the values themselves.*
Sweeping knob a (0.1 / 0.5 / 0.9, the other knob at its default):
▸ vol_gaussian: knob a sweep (docs site)
Sweeping knob b (0.1 / 0.5 / 0.9, the other knob at its default):
▸ vol_gaussian: knob b sweep (docs site)
Stages (the ops that come before → this op, left to right):
▸ vol_gaussian: stages (docs site)
On other images (synthetic scene / photo / coins. Top row: inputs, bottom row: their outputs. Knobs at default):
▸ vol_gaussian: other inputs (docs site)
Motion (GIF: frames / views / slices in turn. The still figure is the complete one; the GIF is supplementary):
Isotropic Gaussian smoothing of a 3D volume. No corresponding HALCON op is specified.
> The detailed description below is the original text — the summary and the headings are translated.
`a が標準偏差 σ を 0.3〜3.0（0.3+2.7a）に振る。b が**端の扱い**を選ぶ: b <= 0.5 で reflect(端画素を複製して折り返す。scipy の既定で、2026-09-17 までの挙動)、以降 nearest / constant(0 で埋める)/ wrap(反対側から巻き取る)。★**窓が 3 のときは reflect と nearest が原理的に一致する**(はみ出しが 1 画素なので複製先が同じ)—— 端の扱いを変えたのに結果が動かないときは、まず窓の大きさを疑うこと(窓 9 では 3 通りとも変わる)。scipy.ndimage は次元非依存（N-D）なので、2-D の _gaussian` と全く同じ式をそのまま 3 軸（CT/MRI/深度スタック等）に適用する。
• gallery2d_physics_alife_3d family guide
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
The program below has been verified to run (same input as the figure). In Studio's help this block becomes buttons that load and run it on the spot.
img_to_volume 0.50 0.50 vol_gaussian 0.50 0.50
▸ Load this pipeline · Load & run
• gallery2d_physics_alife_3d — py -3.11 examples/gallery2d_physics_alife_3d.py
volume as input)identity · vol_median · vol_erode · vol_dilate · vol_threshold · vol_reg_dilate · vol_reg_erode · vol_dilation_ball
3d)vol_median · vol_erode · vol_dilate · vol_threshold · vol_reg_dilate · vol_reg_erode · vol_dilation_ball · vol_erosion_ball
*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.