8910e934da
- Updated degraded-200dpi-ground-truth.txt with accurate transcription - Matches first 2500 chars of source document (as created by PDF generation script) - Contains Abraham Lincoln public domain text with metadata - Verified with diff against source content - Includes verification note at notes/bf-cc7ru.md Acceptance criteria: ✓ Ground truth file exists in tests/fixtures/scanned/low-quality/ ✓ Accurately reflects source document content (verified) ✓ Properly formatted and readable ✓ Special characters handled appropriately Closes bf-cc7ru
59 lines
2.5 KiB
Markdown
59 lines
2.5 KiB
Markdown
# Verification Note: bf-cc7ru - Ground Truth Text File for Degraded Fixture
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## Task Completed
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Created accurate ground truth text file for degraded 200 DPI PDF fixture.
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## What Was Done
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### 1. Analyzed Source Content
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- Examined `tests/fixtures/scanned/low-quality/source-document-abraham-lincoln-public-domain.txt`
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- Reviewed the creation script `create_degraded_200dpi.py` to understand PDF generation
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- Confirmed the PDF contains the first 2500 characters of the source document
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### 2. Created Ground Truth File
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- **File**: `tests/fixtures/scanned/low-quality/degraded-200dpi-ground-truth.txt`
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- **Content**: Exact transcription of the Abraham Lincoln public domain text
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- **Size**: 1967 characters (entire source document is <2500 chars)
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- **Includes**:
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- Title and author information
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- Introductory note with historical context
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- Public domain metadata and source attribution
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- OCR testing suitability notes
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### 3. Verification
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- Confirmed ground truth matches source content exactly (verified with diff)
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- Character count: 1967 characters
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- File is properly formatted and readable
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- Suitable for WER (Word Error Rate) measurement against OCR output
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## Acceptance Criteria Status
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✅ **PASS** - `degraded-200dpi-ground-truth.txt` exists in `tests/fixtures/scanned/low-quality/`
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✅ **PASS** - Ground truth text accurately reflects the source document content (verified with diff)
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✅ **PASS** - File is properly formatted and readable by the measurement script
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✅ **PASS** - Special characters and formatting handled appropriately (punctuation, dates, proper names)
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## Technical Details
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The ground truth contains the complete text that would be extracted from `degraded-200dpi.pdf` if OCR were perfect. This includes:
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- Historical biographical text from 1909 about Abraham Lincoln
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- Dates, names, places suitable for OCR testing
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- Public domain metadata
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- Varied vocabulary and sentence structures
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## Files Modified
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- `tests/fixtures/scanned/low-quality/degraded-200dpi-ground-truth.txt` (updated)
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## Related Files
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- `tests/fixtures/scanned/low-quality/degraded-200dpi.pdf` - the degraded PDF fixture
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- `tests/fixtures/scanned/low-quality/source-document-abraham-lincoln-public-domain.txt` - source document
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- `tests/fixtures/scanned/low-quality/create_degraded_200dpi.py` - PDF generation script
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## Testing Notes
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The ground truth file can now be used by OCR measurement scripts to calculate Word Error Rate (WER) by comparing OCR output against this known-correct text.
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---
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**Generated**: 2026-07-06
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**Bead ID**: bf-cc7ru
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**Status**: COMPLETE
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