pruning — 2D `region` op

• Data kinds: region → region

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

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

pruning: 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

After skeletonization (`skeletonize, or the input as-is if unavailable), repeatedly (1+4*a times) trims off endpoint pixels with a neighbor count of 1 or fewer (spurs = stray branches), removing short branches from the skeleton. Corresponds to HALCON's pruning` (Prune the branches of a region.) (HALCON can specify branch length, but this is an approximation using an iteration count).

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

`a が削り取る反復回数を 1〜5 回の範囲で振る。b` は未使用。回数が

多いほど主要な骨格まで削れてしまうことがある。

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
pruning 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

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).*

pruning — 2D region op