Facial Expression Recognition Algorithm Based on Fusion of Transformed Multilevel Features and Improved Weighted Voting SVM

Table 1

The specific definitions of the nine deformation features.

Location	Calculation method
Curvature of the left eyebrow
Curvature of the right eyebrow
Left eye closure
Right eye closure
Nose tip to upper lip distance
Inner lip closure
Outer lip closure
Degree of the mouth to the left
Degree of the mouth to the right

, the distance from the feature point to the feature point ; , the straight line determined by the feature points and ; and , the horizontal and vertical coordinate of the feature point .