B. Proposed the concept of U-faceU-

B. Proposed the concept of U-face
U-face for the first time has been proposed to improve
the recognition rate. U-face is a face recognition
normalization model, U-face removes hair, background and
other factors that are not conducive to face recognition; and
then replaced with standard background; retain only the
focus of the face region. U-face model is shown in Figure 1.