Extract Technical Drawings from PDF Specs with PyMuPDF and Supervision

                      
                     
import fitz  # PyMuPDF
import os
from typing import List

# Configuration
PDF_PATH = os.getenv('PDF_PATH')  # Path to the PDF file
OUTPUT_DIR = os.getenv('OUTPUT_DIR', './drawings/')  # Output directory for drawings

# Ensure output directory exists
if not os.path.exists(OUTPUT_DIR):
    os.makedirs(OUTPUT_DIR)

def extract_drawings(pdf_path: str) -> List[str]:
    """Extracts technical drawings from a given PDF file."""
    drawings = []
    try:
        document = fitz.open(pdf_path)
        for page_number in range(len(document)):
            page = document.load_page(page_number)
            for img_index, img in enumerate(page.get_images(full=True)):
                xref = img[0]
                base_image = document.extract_image(xref)
                image_bytes = base_image["image"]
                image_filename = f"{OUTPUT_DIR}/drawing_{page_number + 1}_{img_index + 1}.png"
                with open(image_filename, "wb") as img_file:
                    img_file.write(image_bytes)
                drawings.append(image_filename)
        document.close()
    except Exception as e:
        print(f"Error extracting drawings: {e}")
    return drawings

if __name__ == '__main__':
    if not PDF_PATH:
        raise ValueError("PDF_PATH environment variable not set.")
    extracted_drawings = extract_drawings(PDF_PATH)
    print(f"Extracted drawings: {extracted_drawings}")