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OCR/openspec/changes/archive/2025-11-27-fix-ocr-track-table-rendering/tasks.md
egg 59206a6ab8 feat: simplify layout model selection and archive proposals 
Changes:
- Replace PP-Structure 7-slider parameter UI with simple 3-option layout model selector
- Add layout model mapping: chinese (PP-DocLayout-S), default (PubLayNet), cdla
- Add LayoutModelSelector component and zh-TW translations
- Fix "default" model behavior with sentinel value for PubLayNet
- Add gap filling service for OCR track coverage improvement
- Add PP-Structure debug utilities
- Archive completed/incomplete proposals:
  - add-ocr-track-gap-filling (complete)
  - fix-ocr-track-table-rendering (incomplete)
  - simplify-ppstructure-model-selection (22/25 tasks)
- Add new layout model tests, archive old PP-Structure param tests
- Update OpenSpec ocr-processing spec with layout model requirements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-27 13:27:00 +08:00

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Implementation Tasks

Phase 1: Core Fix - Table Content Conversion

1.1 Add TableData.from_dict() class method

  • In unified_document.py, add from_dict() method to TableData class
  • Handle conversion of cells list (list of dicts) to TableCell objects
  • Preserve rows, cols, headers, caption fields

1.2 Fix _json_to_document_element for TABLE elements

  • In pdf_generator_service.py, modify _json_to_document_element
  • When elem_type == ElementType.TABLE and content is dict with 'cells', convert to TableData
  • Use TableData.from_dict() for clean conversion

1.3 Verify TableData.to_html() generates correct HTML

  • Test that to_html() produces parseable HTML with proper row/cell structure
  • Verify colspan/rowspan attributes are correctly generated
  • Ensure empty cells are properly handled

Phase 2: OCR Track Rendering Consistency

2.1 Review convert_unified_document_to_ocr_data

  • Verify TableData objects are properly converted to HTML
  • Add fallback handling for dict content with 'cells' key
  • Log warning if content cannot be converted to HTML

2.2 Review draw_table_region

  • Verify HTMLTableParser correctly parses generated HTML
  • Check that ReportLab Table is positioned at correct bbox
  • Verify font and style application

Phase 3: Testing and Verification

3.1 Test OCR Track

  • Test scan.pdf - verify tables have correct structure
  • Test img1.png, img2.png, img3.png
  • Compare generated PDF with original documents

3.2 Test Direct Track (Regression)

  • Test PDF files with Direct track
  • Verify table rendering unchanged

3.3 Test Hybrid Mode

  • Test files that trigger hybrid processing
  • Verify mixed Direct + OCR elements render correctly

Phase 4: Code Quality

4.1 Add logging

  • Add debug logging for table content type detection
  • Log conversion steps for troubleshooting

4.2 Error handling

  • Handle malformed cell data gracefully
  • Log warnings for unexpected content formats