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breakpilot-lehrer/klausur-service
Benjamin Admin 4a44ad7986
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fix: hard-filter OCR words inside detected graphic regions
Run detect_graphic_elements() in the grid pipeline after image loading
and remove ALL words whose centroids fall inside detected graphic regions,
regardless of confidence. Previously only low-confidence words (conf < 50)
were removed, letting artifacts like "Tr", "Su" survive.

Changes:
- grid_editor_api.py: Import and call detect_graphic_elements() at Step 3a,
  passing only significant words (len >= 3) to avoid short artifacts fooling
  the text-vs-graphic heuristic. Hard-filter all words in graphic regions.
- cv_graphic_detect.py: Lower density threshold from 20% to 5% for large
  regions (>100x80px) — photos/illustrations have low color saturation.
  Raise page-spanning limit from 50% to 60% width/height.

Tested: 5 ground-truth sessions pass regression (079cd0d9, d8533a2c,
2838c7a7, 4233d7e3, 5997b635). Session 5997 now detects 2 graphic regions
and removes 29 artifact words including "Tr" and "Su".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-22 10:18:23 +01:00
..