segmentation op• Data kinds: image → region
• Call: fullseye.apply(img, "xmh_bernsen", 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 real output on a synthetic 128×128 input. Left: input, right: output (a non-image return value is shown as the value itself).*
Bernsen local thresholding (`mahotas.thresholding.bernsen`). Uses the midpoint between the local maximum and minimum brightness as the local threshold, falling back to a global threshold only in low-contrast regions.
> The detailed description below is the original text — the summary and the headings are translated.
`a は近傍半径(3〜15 px)、b` はコントラスト閾値(5〜55。これを下回る低コントラスト域はグローバル閾値 128 で代用)を振る。濃淡ムラのある照明下でのエッジ二値化に向く。
• 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.
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.
xmh_bernsen 0.50 0.50
▸ Load this pipeline · Load & run
• 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 · canny · adaptive_gauss_thresh · sk_otsu · sk_li · sk_yen · sk_sauvola
*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.