sk_medial — 2D `region` op

• Data kinds: region → region

• Call: fullseye.apply(img, "sk_medial", a=0.5, b=0.5) (the 2-D model is one image plus two scalar knobs a,b∈[0,1])

• HALCON equivalent: skeleton (the HALCON reference is a useful guide to its meaning and parameters)

sk_medial: 入力 → 出力

*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).*

Usage

Medial axis transform. A different algorithm from sk_skeleton that finds the skeleton by extracting the ridge lines of the distance transform, tending to produce a skeleton that retains distance-from-contour information.

> The detailed description below is the original text — the summary and the headings are translated.

HALCON の skeleton に相当(近似)。実装は `morphology.medial_axis(binm(v), rng=0) —— rng=0 はタイ(同点)の崩し方を決める乱数シードを固定し、毎回同じ結果になるようにしている。a, b は未使用。distance 出力(return_distance`)は使っておらず、骨格の真偽値マスクのみを返す。

Detailed usage guide

• gallery2d_region family guide

References (sample data, literature)

• 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.

Try it in Studio

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.

threshold 0.50 0.50
sk_medial 0.50 0.50

▸ Load this pipeline · Load & run

Runnable examples (verified samples that actually call this op)

• gallery2d_region — py -3.11 examples/gallery2d_region.py

• poc_crack_width — py -3.11 examples/poc_crack_width.py

• poc_vessel_network — py -3.11 examples/poc_vessel_network.py

Ops the type connects to (they accept `region` as input)

identity · reg_erode · reg_dilate · reg_open · reg_close · fill_holes · select_largest · remove_small

Same category (`region`)

reg_erode · reg_dilate · reg_open · reg_close · fill_holes · select_largest · remove_small · invert_region

*Provenance: ops.py — 2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

sk_medial — 2D region op