C. Calibration of u- face
U-face can also be further broken down, we call the
Figure 1 face model for U-I face model; we will further
propose new U-face models. U-I face of calibration: jaw of
the face at internal bottom of the image; in the vertical
direction of the pupil (as shown in Figure 3), dl equals the
distance of eyebrow to edge of the image, d2 equals the
distance of eyebrow to the pupil, dl equals d2; Get rid of
hair, ears, except for face contour; face contour outside fill
with a uniform background.