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fix(sub-columns): exclude header/footer words from alignment clustering
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Browse Source 
Header/footer words (page numbers, chapter titles) could pollute the
left-edge alignment bins and trigger false sub-column splits. Now
_detect_header_footer_gaps() runs early and its boundaries are passed
to _detect_sub_columns() to filter those words from clustering and
the split threshold check.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Benjamin Admin
2026-03-03 07:33:54 +01:00
parent 3904ddb493
commit 6527beae03
3 changed files with 101 additions and 5 deletions
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7
klausur-service/backend/ocr_pipeline_api.py
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@@ -34,6 +34,7 @@ from cv_vocab_pipeline import (
PageRegion,
RowGeometry,
_cells_to_vocab_entries,
_detect_header_footer_gaps,
_detect_sub_columns,
_fix_character_confusion,
_fix_phonetic_brackets,
@@ -699,8 +700,12 @@ async def detect_columns(session_id: str):
cached["_inv"] = inv
cached["_content_bounds"] = (left_x, right_x, top_y, bottom_y)
# Detect header/footer early so sub-column clustering ignores them
header_y, footer_y = _detect_header_footer_gaps(inv, w, h) if inv is not None else (None, None)
# Split sub-columns (e.g. page references) before classification
geometries = _detect_sub_columns(geometries, content_w, left_x=left_x)
geometries = _detect_sub_columns(geometries, content_w, left_x=left_x,
top_y=top_y, header_y=header_y, footer_y=footer_y)
# Phase B: Content-based classification
regions = classify_column_types(geometries, content_w, top_y, w, h, bottom_y,