Table 5.

Summary of the facial features

Feature	Feature	Description	Statistical features	No. of
category	Name		extracted	features
	Displacement features	Displacement (using (5)) of the six specific points as marked in Fig. 4 denoted by blue points as dp1 to dp6.	Mean, median, minimum, maximum, kurtosis, mode, standard deviation, Root mean square, skewness for Each of 6 displacement points. (dp1 to dp6)	54
Geometrical features	Distances features	Distances(using (6)) between 8 pairs of points as marked in Fig. 4 denoted by black lines as d0 to d7	Mean, median, minimum, maximum, kurtosis, mode, standard deviation, Root mean square, skewness for Each of 8 distances. (d0 to d7)	72
	Region Units	Area of the mouth. Area of the left eye and Areaof the right eye(7) as marked in Fig. 4 is denoted by red irregular lines as A0, A1 and A3.	Mean, median, minimum, maximum, kurtosis, mode, standard deviation, Root mean square, skewness for Areas of mouth, left eye and right eye. (A0 A1 and A2)	27
Facial Action Unit Features	Action Unit features	The facial action coding system is used to quantify the muscle movements on the face. AU occurrences present(1) or absent(0) for 18 AU.	Mean, median, standard deviation, kurtosis, mode, Root mean square, skewness for each 18 AU present/ absent.	126
		If present, AU intensities for 17 AU intensities.	Mean, median, standard deviation, maximum, kurtosis, mode, Root mean square, skewness for each 17 AU intensities	136