PDF to Image Conversion

Requirements

Before running the conversion script, ensure you have:

pdf2image library:
```
pip install pdf2image
```
Poppler for Windows:
- Download from: https://github.com/oschwartz10612/poppler-windows/releases/
- Extract to a known location (e.g., C:\Program Files\poppler)
- Add bin directory to PATH or specify directly in the code

Implementation

The conversion process uses pdf2image to convert PDF files to high-quality PNG images:

import os
from pdf2image import convert_from_path
from pathlib import Path

def convert_pdfs_to_images(pdf_dir, output_base_dir, poppler_path, dpi=300):
    # Verify paths
    print(f"Poppler path: {poppler_path}")
    print(f"PDF directory: {pdf_dir}")
    print(f"Output directory: {output_base_dir}")
    if not os.path.exists(poppler_path):
        raise Exception(f"Poppler path does not exist: {poppler_path}")

    Path(output_base_dir).mkdir(parents=True, exist_ok=True)
    pdf_files = [f for f in os.listdir(pdf_dir) if f.lower().endswith('.pdf')]

    print(f"Found {len(pdf_files)} PDF files")

    for pdf_file in pdf_files:
        pdf_name = os.path.splitext(pdf_file)[0]
        output_dir = os.path.join(output_base_dir, pdf_name)
        Path(output_dir).mkdir(exist_ok=True)

        pdf_path = os.path.join(pdf_dir, pdf_file)
        try:
            print(f"Processing {pdf_file}...")
            images = convert_from_path(
                pdf_path,
                dpi=dpi,
                poppler_path=poppler_path
            )

            for i, image in enumerate(images):
                image_path = os.path.join(output_dir, f'page_{i+1}.png')
                image.save(image_path, 'PNG')
                print(f'Saved {image_path}')

        except Exception as e:
            print(f'Error processing {pdf_file}: {str(e)}')

Parameters

pdf_dir: Directory containing PDF files
output_base_dir: Base directory for output images
poppler_path: Path to Poppler binaries
dpi: Resolution of output images (default: 300)

Directory Structure

Input structure:

data/
└── raw/
    └── pdfs/
        ├── article1.pdf
        ├── article2.pdf
        └── ...

Output structure:

data/
└── processed/
    └── pdf_images/
        ├── article1/
        │   ├── page_1.png
        │   ├── page_2.png
        │   └── ...
        ├── article2/
        │   ├── page_1.png
        │   ├── page_2.png
        │   └── ...
        └── ...

Usage

Configure paths and run the conversion:

# Configure paths
pdf_dir = "path/to/pdf/directory"
output_dir = "path/to/output/directory"
poppler_path = "path/to/poppler/bin"

# Run conversion
convert_pdfs_to_images(pdf_dir, output_dir, poppler_path)