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jedarden 03ea2e2822 docs(bf-7mvji): add verification note for form OCR fixture 
Confirm form-300dpi.pdf and form-300dpi-ground-truth.txt exist
and meet all acceptance criteria:
- PDF is true scanned content (no text layer)
- Exactly 300 DPI (2550x3300 pixels for 8.5x11" page)
- Ground truth contains complete 79-line employment application form

Closes bf-7mvji
2026-07-05 18:25:10 -04:00

2.6 KiB
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Form OCR Fixture Verification (bf-7mvji)

Task

Source and create form OCR fixture at 300 DPI with ground truth text.

Verification Results

Acceptance Criteria Status

✅ PASS: form-300dpi.pdf exists in tests/fixtures/scanned/form/

  • File: 810K PDF
  • Location: /home/coding/pdftract/tests/fixtures/scanned/form/form-300dpi.pdf
  • Created: 2026-07-05

✅ PASS: form-300dpi-ground-truth.txt exists with complete text content

  • File: 3.0K text file
  • Location: /home/coding/pdftract/tests/fixtures/scanned/form/form-300dpi-ground-truth.txt
  • Contains complete employment application form text (79 lines)
  • Includes all form fields, labels, and certification text

✅ PASS: PDF is actual scanned content (no text layer)

  • pdffonts shows no embedded fonts
  • pdfimages -list confirms 3 image pages:
    • Page 1: 2550x3300 grayscale image (335K)
    • Page 2: 2550x3300 grayscale image (323K)
    • Page 3: 2550x3300 grayscale image (147K)
  • No text extraction possible (true scanned PDF)

✅ PASS: PDF is approximately 300 DPI

  • Image dimensions: 2550 x 3300 pixels
  • For US Letter (8.5" x 11"):
    • Width DPI: 2550 / 8.5 = 300.0 DPI
    • Height DPI: 3300 / 11.0 = 300.0 DPI
  • Exact match to 300 DPI target

Source Document

The fixtures were created as part of the scanned fixtures generation process using convert_to_scanned.sh, which converts text-embedded PDFs to true scanned image-based PDFs at 300 DPI. The source is a generic employment application form (public domain content).

Files Verified

  1. tests/fixtures/scanned/form/form-300dpi.pdf

    • 810K scanned PDF
    • 3 pages
    • True image-based content (no text layer)
    • Exactly 300 DPI

  2. tests/fixtures/scanned/form/form-300dpi-ground-truth.txt

    • 79 lines of complete form text
    • Includes all fields: Personal Information, Availability, Education, Employment History, References, Certification
    • Formatted with line numbers for OCR evaluation

Verification Commands Used

# Check file existence
ls -lh tests/fixtures/scanned/form/form-300dpi.pdf
ls -lh tests/fixtures/scanned/form/form-300dpi-ground-truth.txt

# Verify scanned content (no fonts)
pdffonts tests/fixtures/scanned/form/form-300dpi.pdf

# Verify image content and dimensions
pdfimages -list tests/fixtures/scanned/form/form-300dpi.pdf

# Calculate DPI
python3 -c "width_px=2550; height_px=3300; print(f'{width_px/8.5:.1f} x {height_px/11.0:.1f} DPI')"

Conclusion

All acceptance criteria for bead bf-7mvji are met. The form OCR fixtures exist, contain proper scanned content at exactly 300 DPI, and include complete ground truth text for OCR evaluation.