morphology op• Data kinds: image → image
• Call: fullseye.apply(img, "morph_grad", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])
• HALCON equivalent: gray_range_rect (the HALCON reference is a useful guide to its meaning and parameters)
*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).*
Morphological gradient (dilation minus erosion). Equivalent to HALCON's `gray_range_rect` (Determine the gray value range within a rectangle.).
> The detailed description below is the original text — the summary and the headings are translated.
`a が構造要素の一辺を 3,5,7,9（_k(a)）に振る。b は未使用。窓内の最大値と最小値の差を返すため、エッジ検出フィルタ（Sobel 等）に似た働きをするが方向を持たない。結果は _norm` で正規化される。
• gallery2d_morphology 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.
morph_grad 0.35 0.50
▸ Load this pipeline · Load & run
• gallery2d_morphology — py -3.11 examples/gallery2d_morphology.py
image as input)identity · gaussian · mean_box · bilateral · unsharp · median · min_filter · max_filter
morphology)gerode · gdilate · gopen · gclose · tophat · bothat · sk_area_opening · cv_open
*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.