blob_boundaries — BLOB extract op

• Data kinds: labels2d → mask

• Call: import blob2d; blob2d.blob_boundaries(labels: 'Any') -> 'np.ndarray' (or opsblob.get("blob_boundaries"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

物体の輪郭(1 画素幅、bool)。隣り合う物体の境目も残る。

内側の縁を取る(自分と違うラベルに隣接する前景画素)ので、輪郭は必ず

物体の内部にある —— 外側を取ると隣の物体の画素を輪郭だと言うことになる。

Detailed usage guide

• blob_analysis 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.

Runnable examples (verified samples that actually call this op)

• poc_gear_tooth_metrology — py -3.11 examples/poc_gear_tooth_metrology.py

Ops the type connects to (they accept mask as input)

blob_label · blob_distance

Same category (extract)

blob_region · blob_overlay

*Provenance: blob2d.py — BLOB 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.