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Henrik Jess Nielsen
2026-06-01 23:40:55 +02:00
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.ai-rulez/domains/ocr-integration/DOMAIN.md Normal file
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description: OCR backend integration and image processing
---
- Multiple backends: Tesseract (C FFI via leptonica/tesseract-sys), PaddleOCR (ONNX Runtime), Python backends (EasyOCR, Surya) via FFI
- Backend selection: priority-based with fallback — Tesseract default, PaddleOCR for CJK, Python backends as fallback
- Image preprocessing: deskew, binarization, noise removal, contrast enhancement — applied before OCR
- PSM modes: configurable page segmentation (single block, single line, sparse text) per use case
- Table detection: identify table regions → cell extraction → row/column reconstruction → Markdown table output
- hOCR: parse Tesseract hOCR output for word-level bounding boxes, confidence scores, reading order
- Language management: auto-detect document language, load appropriate Tesseract traineddata, support multi-language documents
- Caching: cache OCR results by image hash + backend + language + PSM mode
- Confidence tracking: per-word and per-page confidence scores, flag low-confidence regions for review