Fine-tuning YOLOv11 to detect stamps and signatures on banking documents - a practical walkthrough

Every day, banking ops teams manually review thousands of documents - loan applications, KYC forms, contracts - looking for the right stamps, the right signatures, in the right places. It's slow, expensive, and exactly the kind of work computer vision was made to automate. The catch is that most YOLO tutorials online teach you to detect cars, dogs, or people in natural photos. None of that translates cleanly to documents. Documents are structured, scanned at varying quality, often photographed o