8473941ebb
- Add notes/bf-e4uvb-child-1.md with comprehensive documentation - Mark ToUnicodeMap::add_mapping() in cmap.rs (line 86) - Mark DifferencesOverlay entry creation in encoding.rs (line 195) - Mark CodespaceRange creation in codespace.rs (line 256) These are the critical insertion points for future unmapped glyph skip logic. Closes bf-e4uvb-child-1.
49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
# bf-58jnx: Add high-quality single-page OCR fixtures
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## Summary
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Verified and committed 300 DPI single-page OCR fixtures for invoice, letter, and form document types with ground truth text files.
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## Verification
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### Fixtures Created
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All fixtures exist in `tests/fixtures/scanned/`:
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1. **Invoice** (`invoice/invoice-300dpi.pdf` + `invoice/invoice-300dpi-ground-truth.txt`)
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- 177 words in ground truth
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- Contains realistic invoice with header, line items, totals, payment details
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2. **Letter** (`letter/letter-300dpi.pdf` + `letter/letter-300dpi-ground-truth.txt`)
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- 227 words in ground truth
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- Contains business letter with header, body, signature block
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3. **Form** (`form/form-300dpi.pdf` + `form/form-300dpi-ground-truth.txt`)
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- 281 words in ground truth
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- Contains employment application form with multiple fields and checkboxes
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### Acceptance Criteria Verification
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#### ✅ 3 fixtures exist in `tests/fixtures/scanned/`
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All three fixtures (invoice, letter, form) are present with both PDF and ground truth text files.
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#### ✅ Each has a PDF + ground truth .txt file
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All fixtures have both components:
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- Invoice: 661KB PDF + 1.8KB ground truth
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- Letter: 448KB PDF + 1.4KB ground truth
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- Form: 829KB PDF + 3.0KB ground truth
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#### ✅ Each PDF is ~300 DPI
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Verified using `pdfimages -list`:
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- All images are 2550×3300 pixels
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- At standard US Letter size (8.5" × 11"), this equals exactly 300 DPI
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- No embedded fonts (`pdffonts` shows no fonts), confirming true scanned content
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#### ✅ Running WER script with perfect OCR gives WER = 0%
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Tested `scripts/measure-wer.sh` on each ground truth file:
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- Invoice: WER 0.00% (177/177 words match)
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- Letter: WER 0.00% (227/227 words match)
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- Form: WER 0.00% (281/281 words match)
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## References
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- Plan line 28 (WER <3% gate)
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- Parent bead: bf-33zjo
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- Prerequisite: bf-3gewx (WER script)
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