The Door Projection Security System is a smart, real-time solution designed to enhance residential security by projecting a live video feed of visitors directly onto the inside surface of the door. Instead of relying on traditional peepholes, phone-based apps, or expensive smart doorbells, this system uses a front-facing camera and a short-throw projector to create a life-sized, to-scale display of anyone standing outside the door. The system is triggered automatically by motion or doorbell activation and provides a hands-free, intuitive, and privacy-focused alternative to existing solutions.