Table 1: All features used in this study and brief descriptions.

SpeechBrief description

xF0Basic pitch of X. X is one of five vowels (A, E, I, O, and U).
xF1Formant of 1st in 4 frequency periods of X
xF2Formant of 2nd in 4 frequency periods of X
xJITAMean ratio of change in pitch period of X
xRF60_120_F240_480(Frequency band of 60~120 Hz)/(frequency band of 240~480 Hz) of X
xRF240_480_960_1960(Frequency band of 240~480 Hz)/(frequency band of 960~1960 Hz) of X
aRF2_F1Relative ratio between frequencies of A (aF2/aF1)
iDF0_aF0Difference of frequencies (iF0-aF0)
uDF0_oF0Difference of frequencies (uF0-oF0)
xMFCC4Mel frequency cepstral coefficients of X
SITSAmplitude average
SISTDStandard deviation of amplitude average
SSPDTime to read one sentence
RSF60_120_240_480(Power of frequency band of 60~120)/(power of frequency band of 240~480) (one sentence)
RSF240_480_960_1960(Power of frequency band of 240~480)/(power of frequency band of 960~1960) (one sentence)

FaceBrief description

HeightWeight
WeightHeight
FD 𝑛 1 _ 𝑛 2 Distance between point 𝑛 1 and 𝑛 2 in a frontal (or profile) image
FDH 𝑛 1 _ 𝑛 2 Horizontal distance between 𝑛 1 and 𝑛 2 in an image
FDV 𝑛 1 _ 𝑛 2 Vertical distance between 𝑛 1 and 𝑛 2 in a frontal (or profile) image
FA 𝑛 1 _ 𝑛 2 _ 𝑛 3 Angle of three points 𝑛 1 , 𝑛 2 , and 𝑛 3 in an image
FA 𝑛 1 _ 𝑛 2 Angle between the line through 2 points 𝑛 1 and 𝑛 2 and a horizontal line
FR02_psuFD(17,26)/FD(18,25)
FR03_psu(FD [ 1 8 , 2 5 ] + FD [ 1 1 8 , 1 2 5 ] )/FDH(33,133)
FR05_psuFDH(33,133)/FD(43,143)
FR06_psuFDH(33,133)/FDV(52,50)
FR08_psuFD(43,143)/FDV(52,50)
FArea02Area of the contour formed by the points 53,153, 133, 194, 94, 33, and 53 in an image
FArea03Area of the contour formed by the points 94, 194, 143, 43, and 94
Fh_Cur_Max_DistanDistance between points 7 and 77
Fh_Angle_ 𝑛 1 _ 𝑛 2 Angle between the line through 2 points 𝑛 1 and 𝑛 2 and a horizontal line
Nose_Angle_ 𝑛 1 _ 𝑛 2 Angle between the line through 2 points 𝑛 1 and 𝑛 2 and a horizontal line
Nose_Angle_ 𝑛 1 _ 𝑛 2 _ 𝑛 3 Angle of 3 points 𝑛 1 , 𝑛 2 , and 𝑛 3
SA 𝑛 1 _ 𝑛 2 Angle between the line through 2 points 𝑛 1 and 𝑛 2 and a horizontal line
Fh_Cur_Max_R79_69FD(77,9)/FD(6,9)
Nose_Area_ 𝑛 1 _ 𝑛 2 _ 𝑛 3 Area of the triangle formed by 3 points 𝑛 1 , 𝑛 2 , and 𝑛 3 in an image
EUL_L_el1~el7 Slope of the tangent at a point (el1~el7) in an image
EUL_R_er1~er7 Slope of the tangent at a point (er1~er7) in an image