Table 1.

Extracted features

Data	Feature
Facial feature point	Distance from nose to each point, eyebrows to eyes and Eyebrows to mouth
Head movement	Position of the head (x,y axes), Angle of rotation of the head (yaw, pitch, roll)
Eye	Area, Number of blinks, Vertical and horizontal distance, Coordinates of gaze direction, Angle of gaze
Mouth	Area, Number of absences, Vertical and horizontal distances
AU	Strength(none - very strong)
3D skeletal coordinates	Distance between each feature point pair, Area of the three feature points, Angle between the centre point and the other points