Classification of extreme facial events in sign language videos

EURASIP Journal on Image and Video Processing

Table 1 Facial event default configuration

Facial event	Feature		Symmetry	SPThres	Figure
Pose yaw	GAAM	$p_{1}^{G}$	Symmetric	[ 30,10,30]	7
Pose pitch	GAAM	$p_{2}^{G}$	Symmetric	[ 30,10,30]	11
Pose roll	GAAM	θ	Symmetric	[ 30,10,30]	11
Vertical translation	Geometrical	Nosetip	Symmetric	[ 30,10,30]	12
Eye open/close	Geometrical	Eyelids	Upper-asymmetric	[ 20,10,40]	12
Brow up/down	Brow LAAM	$p_{1}^{L}$	Symmetric	[ 30,10,30]	13
Mouth open/close	Mouth LAAM	$p_{1}^{L}$	Lower-asymmetric	[ 40,10,20]	13
Teeth in/out	Mouth LAAM	$λ_{1}^{L}$	Symmetric	[ 30,10,30]	13
Tongue in/out	Mouth LAAM	$λ_{2}^{L}$	Symmetric	[ 30,10,30]	13

Correspondence among facial events, feature type, symmetry/asymmetry and SPThres_{L,C,U} default values. The presented SPThres values correspond to ESC’s default configuration.