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feat(ocr): add image preprocessing pipeline to improve transcription quality on aged documents #255

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marcel merged 7 commits from feat/issue-252-ocr-preprocessing into main 2026-04-17 15:50:37 +02:00
Conversation 13 Commits 7 Files Changed 18 +327

7 Commits

Author SHA1 Message Date
Marcel
4cb7c975f5 test(ocr): add resilience tests for tiny image and unexpected exception propagation
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Add test for 1×1 image (sub-tile-size) resilience and narrow preprocess_page
fallback from except Exception to (cv2.error, ValueError, MemoryError) so
programming errors propagate instead of being silently swallowed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
 2026-04-17 15:16:17 +02:00
Marcel
97c94c91f8 test(ocr): guard translateOcrProgress fallback for PREPROCESSING_PAGE with missing colon parts 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
 2026-04-17 15:13:52 +02:00
Marcel
eaefd4091e feat(ocr): add PREPROCESSING_PAGE progress translation and i18n strings
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
 2026-04-17 14:27:42 +02:00
Marcel
ba36a88b65 feat(ocr): add Preprocessing NDJSON event to Java stream pipeline 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
 2026-04-17 14:21:00 +02:00
Marcel
b310caaeeb feat(ocr): integrate preprocessing into stream and batch endpoints 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
 2026-04-17 14:16:47 +02:00
Marcel
615d404ba9 chore(ocr): add opencv-python-headless, libglib2.0-0, and CLAHE env vars 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
 2026-04-17 14:14:47 +02:00
Marcel
7183fc4428 feat(ocr): add image preprocessing module with CLAHE + grayscale + blur 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
 2026-04-17 14:13:42 +02:00