segmentation op• Data kinds: image → region
• Call: fullseye.apply(img, "canny", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: edges_image (the HALCON reference is a useful guide to its meaning and parameters)
> This operator's description has not been translated yet. The original text follows as it is.
簡易 Canny 風エッジ検出（region を返す）。HALCON の `edges_image`（Extract edges using Deriche, Lanser, Shen, or Canny filters.）に対応付けられているが、非極大抑制やヒステリシスしきい値処理は行わない簡略版（近似）。
`a が事前平滑化のガウシアン σ を 0.5〜2.0 に、b がしきい値を 0.1〜0.6 に振る。ガウシアンでぼかした画像に Sobel 勾配強度を掛け、正規化した値を b` で二値化するだけ——本家 Canny の細線化（1画素幅への収束）は無いため、エッジは本来の Canny より太く、複数画素にまたがって残る。
• gallery2d_segmentation 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.
• gallery2d_segmentation — py -3.11 examples/gallery2d_segmentation.py
region as input)identity · reg_erode · reg_dilate · reg_open · reg_close · fill_holes · select_largest · remove_small
segmentation)threshold · otsu · adaptive_gauss_thresh · sk_otsu · sk_li · sk_yen · sk_sauvola · sk_niblack
*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.