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fix: scan multiple y-order lines in prefix recovery for multi-column layouts

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Previous code only checked the immediate next PDF line by y-order.
In multi-column layouts, the next line might be from a different column
(e.g. right column body text between left-column heading and its caption).
Now scans up to 10 lines or 100px y-distance below the heading for a
match, then returns the first match.
This commit is contained in:
LLLin000 2026-07-03 02:09:11 +08:00
parent 322af48609
commit f5f82941df
1 changed files with 20 additions and 16 deletions
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36
paperforge/worker/ocr_figures.py
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@ -6085,21 +6085,25 @@ def _recover_figure_heading_prefix(
if len(line_text) > 40:
continue # too long for a heading — probably in-text reference
# Check the next PDF line (by y-order) matches the start of block text
if i + 1 >= len(sorted_lines):
continue
next_text = str(sorted_lines[i + 1].get("text", "") or "").strip()
if not next_text or len(next_text) < 10:
continue
# Common-prefix match: at least 15 chars case-insensitive
common = 0
for a, b in zip(next_text.lower(), block_text.lower()):
if a == b:
common += 1
else:
break
if common >= 15:
return line_text + "\n" + block_text
# Scan lines below the heading (by y-order) for a caption text match
heading_y = (line.get("bbox") or [0, 0, 0, 0])[1]
found = False
for j in range(i + 1, min(i + 10, len(sorted_lines))):
nxt = sorted_lines[j]
nxt_y = (nxt.get("bbox") or [0, 0, 0, 0])[1]
if nxt_y - heading_y > 100:
break # too far down — not the same caption block
next_text = str(nxt.get("text", "") or "").strip()
if not next_text or len(next_text) < 10:
continue
# Common-prefix match: at least 15 chars case-insensitive
common = 0
for a, b in zip(next_text.lower(), block_text.lower()):
if a == b:
common += 1
else:
break
if common >= 15 or next_text in block_text:
return line_text + "\n" + block_text
return None