3 Face recognition
3.1 Face recognition methods

Face recognition systems fall into two categories: verification and identification.

Face verification is a 1:1 match. In this process face image whose identity is being claimed is compared to a template face images.

On the contrary, face identification is a 1:N problem. Face image is compared to all image templates in a face database to determine the identity of the query face.

In case we do not know if the tested face is in the system database, process is as following. The query face image is also compared against all the face images in the database, evaluating probability for each one. All these probabilities are numerically ranked: the highest value is first. In case probability is higher than given threshold, system notifies us about the result [1].

The selected basic 2D face recognition methods: