
How face detection works: principles and applications
Face detection is the foundation of modern biometric systems. It allows software like Identy.io to automatically identify and locate human faces in images or video streams. While face recognition determines who a person is, face detection answers whether a face is present and where. Today, this technology powers everything from smartphone authentication to digital onboarding processes and AI-driven marketing. Understanding its principles helps explain why it has become essential to security and user experience. From classic algorithms to Deep Learning 1. The early days: Haar cascades The first widespread method was the Viola-Jones algorithm, which uses Haar features simple patterns of







