text_lines — TEXT `layout` op

• Data kinds: table → table

• Call: import fullseye as fs; fs.ledger.text_lines(boxes, stroke_width=None, overlap_ratio: 'float' = 0.5, gap_ratio: 'float' = 3.0, width_ratio: 'float' = 3.0) (to call the implementation directly, import textregion; textregion.text_lines(boxes, stroke_width=None, overlap_ratio: 'float' = 0.5, gap_ratio: 'float' = 3.0, width_ratio: 'float' = 3.0); from the registry, opstext.get("text_lines"))

Usage

Groups character-candidate boxes into lines (vertically overlapping, horizontally close, similar stroke width).

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

★規則の根拠(2026-09-27 実測): 候補は字画ごとの断片になる(横棒と 'l' では高さが 5 倍

違う)ので「高さが近い」を条件にすると 3 行が 30〜60 行に割れた。行の同一性は**縦の

重なり**(小さい方の高さの `overlap_ratio` 以上)で判定し、横の隙間は大きい方の高さの

`gap_ratio 倍以内、ストローク幅は width_ratio` 倍以内。

Returns dict: `lines(M×4 の矩形)/ members`(各行の候補 index のリスト)。

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_text_region_truth — py -3.11 examples/poc_text_region_truth.py

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

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Same category (`layout`)

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

text_lines — TEXT layout op