Because of face recognition, you can unlock a smartphone by simply showing it your face. For instance, Facebook and Google Photos can tell who is in a picture. Face recognition is finding a face and then matching it against a database of recognized images.
The next phase of facial recognition is surveillance, which is already available on some types of home cameras and in some commercial security operations.
Face surveillance systems use computer programs to identify and track people at a distance without their knowledge or consent by analyzing images of human faces.