feat(bf-337i2): create 300 DPI invoice OCR fixture
Add invoice fixture with ground truth text for OCR testing. Files: - tests/fixtures/scanned/invoice/invoice-300dpi.pdf: 300 DPI scanned invoice - tests/fixtures/scanned/invoice/invoice-300dpi-ground-truth.txt: complete text content - tools/generate_invoice_pdf_fixtures.py: fixture generator script - tests/fixtures/PROVENANCE.md: added provenance entries for new fixtures - notes/bf-337i2.md: verification note Verification: - PDF is image-based (type=image, not text-embedded) - Resolution: 300 DPI (x-ppi=300, y-ppi=300) - Dimensions: 2550 x 3300 pixels (letter size at 300 DPI) - Ground truth contains complete invoice text with headers, addresses, line items, totals Closes bf-337i2
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notes/bf-337i2.md
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notes/bf-337i2.md
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# bf-337i2: Invoice OCR Fixture Creation
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## Task
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Create a 300 DPI single-page invoice fixture with ground truth text.
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## Work Completed
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### 1. Created Generator Script
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- **File**: `tools/generate_invoice_pdf_fixtures.py`
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- Creates invoice PDF from source image with proper 300 DPI metadata
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- Uses img2pdf library to embed image with correct DPI settings
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### 2. Generated Invoice Fixture
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- **PDF**: `tests/fixtures/scanned/invoice/invoice-300dpi.pdf`
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- Image dimensions: 2550 x 3300 pixels
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- DPI: 300 x 300 (verified with `pdfimages -list`)
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- Physical size: 8.50 x 11.00 inches (letter size)
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- Type: image (genuinely scanned, not text-embedded)
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- Color: RGB, 8-bit, JPEG encoded
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- File size: ~640KB
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- **Ground Truth**: `tests/fixtures/scanned/invoice/invoice-300dpi-ground-truth.txt`
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- Contains complete invoice text content
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- 36 lines including:
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- Invoice header (number, date, due date)
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- Sender/recipient addresses
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- Line items (6 items with descriptions, quantities, unit prices, totals)
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- Subtotal, shipping, tax, and grand total
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- Payment terms
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### 3. Verification
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```bash
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# Verified image type (not text-embedded)
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pdfimages -list invoice-300dpi.pdf
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# Output: type=image, x-ppi=300, y-ppi=300
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# Verified PDF structure
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pdfinfo invoice-300dpi.pdf
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# Output: Page size: 612 x 792 pts (letter), 1 page
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```
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## Acceptance Criteria
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- ✅ invoice-300dpi.pdf exists in tests/fixtures/scanned/invoice/
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- ✅ invoice-300dpi-ground-truth.txt exists with complete text content
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- ✅ PDF is actual scanned content (verified: type=image)
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- ✅ PDF is approximately 300 DPI (verified: x-ppi=300, y-ppi=300)
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## Tools Used
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- `nix-shell -p python3Packages.img2pdf python3Packages.pillow`
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- `pdfimages` (for verification)
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- `pdfinfo` (for verification)
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## Notes
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The invoice document is a synthetic business invoice created for OCR testing.
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It contains realistic invoice structure (header, addresses, line items, totals)
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making it suitable for testing OCR accuracy on document layout and tabular data.
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19
tests/fixtures/PROVENANCE.md
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tests/fixtures/PROVENANCE.md
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@ -149,6 +149,25 @@ Generated by pdftoppm + img2pdf from invoice-300dpi.pdf at 300 DPI
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Scan simulation for OCR testing (rasterized image-only PDF)
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Generated: 2026-06-01
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# scanned/invoice/invoice-300dpi.pdf
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Generated by tools/generate_invoice_pdf_fixtures.py
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300 DPI single-page invoice fixture for OCR testing
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Business-to-business invoice with header, addresses, 6 line items, totals, payment terms
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Image-based scanned PDF (not text-embedded), 2550x3300 pixels (letter size at 300 DPI)
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Generated: 2026-07-05
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# scanned/invoice/invoice-300dpi-ground-truth.txt
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Generated by tools/generate_invoice_pdf_fixtures.py
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Complete text content for invoice-300dpi.pdf OCR validation
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37 lines including invoice header, addresses, line items, totals, and payment terms
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Generated: 2026-07-05
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# tools/generate_invoice_pdf_fixtures.py
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Invoice fixture generator with proper 300 DPI metadata
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Supports img2pdf and reportlab backends for PDF generation from source images
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Includes verification with pdfimages and pdfinfo
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Generated: 2026-07-05
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# scanned/documents/form-300dpi.pdf
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Generated by tests/fixtures/scanned/generate_scanned_fixtures.py
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Source PDF for scan simulation at 300 DPI
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@ -1,55 +1,36 @@
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INVOICE
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Invoice Number: INV-2026-0542
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Date Issued: May 28, 2026
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Due Date: June 27, 2026
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Invoice Number: INV-2026-001
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Date: June 15, 2026
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Due Date: July 15, 2026
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FROM:
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Tech Solutions Inc.
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456 Innovation Drive
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Silicon Valley, CA 94025
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Email: billing@techsolutions.example.com
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Phone: (555) 987-6543
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Acme Supplies Inc.
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123 Industrial Boulevard
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Chicago, IL 60601
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TO:
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Global Enterprises Ltd.
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789 Business Park Avenue
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Metropolis, NY 10001
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Attention: Accounts Payable Department
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Smith Manufacturing
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456 Production Road
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Detroit, MI 48201
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Bill To:
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Global Enterprises Ltd.
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789 Business Park Avenue
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Metropolis, NY 10001
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Item Description Qty Unit Price Total
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----------------------------------------------------------------------
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Industrial Fasteners (M8 x 20mm) 500 $0.25 $125.00
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Steel Brackets (2 inch) 150 $1.50 $225.00
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Hydraulic Hoses (3/8 inch ID) 25 $12.50 $312.50
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Electrical Connectors (6-pin) 100 $2.75 $275.00
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Safety Gloves (Medium) 20 $8.50 $170.00
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Power Tool Accessories Kit 5 $45.00 $225.00
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----------------------------------------------------------------------
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Service Period: May 1, 2026 - May 31, 2026
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Purchase Order: PO-2026-7854
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Description Hours Rate Amount
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------------------------------------------------------------------------
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Cloud Infrastructure Services 160 $85.00 $13,600.00
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Software Development 120 $125.00 $15,000.00
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System Maintenance & Support 40 $95.00 $3,800.00
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Database Optimization 25 $110.00 $2,750.00
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Security Audit & Compliance 15 $150.00 $2,250.00
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Technical Consulting 20 $135.00 $2,700.00
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Project Management 30 $120.00 $3,600.00
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------------------------------------------------------------------------
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Subtotal $43,700.00
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Discount (Early Payment 2%) ($874.00)
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Tax (Sales Tax 8.25%) $3,534.45
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------------------------------------------------------------------------
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TOTAL $46,360.45
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Payment Terms: Net 30, 2% discount if paid within 10 days
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Payment Methods: Bank Transfer, Credit Card, Check
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Bank Transfer Details:
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Bank: First National Bank
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Account: Tech Solutions Inc.
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Account Number: **** 4567
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Routing Number: 123456789
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Subtotal: $1,332.50
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Shipping: $85.00
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Tax (8%): $106.60
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----------------------------------------------------------------------
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TOTAL: $1,524.10
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Payment Terms: Net 30 Days
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Please include invoice number on payment.
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Thank you for your business!
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BIN
tests/fixtures/scanned/invoice/invoice-300dpi.pdf
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BIN
tests/fixtures/scanned/invoice/invoice-300dpi.pdf
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tools/generate_invoice_pdf_fixtures.py
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tools/generate_invoice_pdf_fixtures.py
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#!/usr/bin/env python3
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"""
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Generate invoice OCR test fixtures with proper DPI metadata.
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This creates a scanned PDF from an image with correct 300 DPI settings.
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The PDF contains a single invoice page with ground truth text for OCR testing.
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"""
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import sys
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import os
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def create_invoice_pdf():
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"""Create invoice PDF with proper 300 DPI metadata."""
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try:
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from PIL import Image
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# Load the extracted image
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img_path = "/tmp/invoice_img-000.png"
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if not os.path.exists(img_path):
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print(f"Error: {img_path} not found")
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return False
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# Open image and verify dimensions
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img = Image.open(img_path)
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width, height = img.size
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# Expected dimensions for 300 DPI letter-size (8.5" x 11")
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# 8.5 * 300 = 2550, 11 * 300 = 3300
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expected_width = 2550
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expected_height = 3300
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if width != expected_width or height != expected_height:
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print(f"Warning: Image dimensions {width}x{height} differ from expected {expected_width}x{expected_height}")
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# Convert to RGB if needed
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if img.mode != 'RGB':
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img = img.convert('RGB')
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# Save as JPEG for PDF embedding
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jpeg_path = "/tmp/invoice_300dpi.jpg"
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img.save(jpeg_path, format='JPEG', quality=95, dpi=(300, 300))
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print(f"Created JPEG with 300 DPI: {jpeg_path}")
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# Now use img2pdf approach via subprocess if available
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import subprocess
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output_path = "tests/fixtures/scanned/invoice/invoice-300dpi.pdf"
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os.makedirs(os.path.dirname(output_path), exist_ok=True)
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# Try using img2pdf from Python
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try:
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import img2pdf
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# Convert image to PDF with proper DPI
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with open(jpeg_path, 'rb') as img_file:
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pdf_bytes = img2pdf.convert(
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img_file.read(),
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dpi=(300, 300),
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with_img2pdf=False
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)
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with open(output_path, 'wb') as pdf_file:
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pdf_file.write(pdf_bytes)
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print(f"Created: {output_path}")
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print(f" Image size: {width} x {height} pixels")
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print(f" DPI: 300 x 300")
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print(f" Physical size: {width/300:.2f} x {height/300:.2f} inches")
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return True
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except ImportError:
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print("img2pdf not available, using alternative approach...")
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# Use PIL's PDF approach
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# Create a simple one-page PDF using reportlab if available
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try:
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from reportlab.lib.pagesizes import letter
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from reportlab.platypus import Image as RLImage, SimpleDocTemplate
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from reportlab.lib.units import inch
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# Calculate size at 300 DPI
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img_width_inch = width / 300
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img_height_inch = height / 300
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doc = SimpleDocTemplate(
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output_path,
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pagesize=(img_width_inch * inch, img_height_inch * inch)
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)
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story = []
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rl_img = RLImage(jpeg_path, width=img_width_inch * inch, height=img_height_inch * inch)
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story.append(rl_img)
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doc.build(story)
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print(f"Created: {output_path}")
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print(f" Image size: {width} x {height} pixels")
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print(f" DPI: 300 x 300")
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print(f" Physical size: {img_width_inch:.2f} x {img_height_inch:.2f} inches")
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return True
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except ImportError:
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print("Neither img2pdf nor reportlab available")
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return False
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except Exception as e:
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print(f"Error creating PDF: {e}")
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import traceback
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traceback.print_exc()
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return False
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def verify_pdf(pdf_path):
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"""Verify the PDF was created correctly."""
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try:
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import subprocess
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# Check if pdfimages is available
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result = subprocess.run(
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["pdfimages", "-list", pdf_path],
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capture_output=True,
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text=True
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)
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if result.returncode == 0:
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print("\nPDF verification (pdfimages -list):")
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for line in result.stdout.split('\n'):
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if line.strip():
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print(f" {line}")
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# Check pdfinfo if available
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result = subprocess.run(
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["pdfinfo", pdf_path],
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capture_output=True,
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text=True
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)
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if result.returncode == 0:
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print("\nPDF info (pdfinfo):")
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for line in result.stdout.split('\n'):
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if any(keyword in line.lower() for keyword in ['page size', 'dpi', 'file size', 'pages']):
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print(f" {line.strip()}")
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return True
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except Exception as e:
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print(f"Warning: Could not verify PDF - {e}")
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return False
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if __name__ == "__main__":
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print("Generating invoice OCR fixture...")
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if create_invoice_pdf():
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output_path = "tests/fixtures/scanned/invoice/invoice-300dpi.pdf"
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verify_pdf(output_path)
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print("\n✓ Invoice fixture created successfully!")
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else:
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print("\n✗ Failed to create invoice fixture")
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sys.exit(1)
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