Face detection

With the increasing severity of crimes in today's society, security systems are becoming increasingly important. In the past, passwords and magnetic codes were used for identity verification, but there were still shortcomings, such as password theft and card loss. Therefore, a more reliable method is to use biological features such as fingerprints, faces, and irises as mechanisms. Facial recognition is a hot topic in biometric recognition, and it can be used to identify suspects in criminal incidents. The prerequisite for recognition is to filter out unwanted noise (background, non-face foreground areas) in the image, find the required facial area and mark its position, making it easier for subsequent tracking and identity verification applications.