Tracking a Subset of Skeleton Joints: An Effective Approach towards Complex Human Activity Recognition

Table 1

The summary of the joints and their reference points used during manual selection of subset joints where the /right_hand_2 shows the right hand of second user during handshake activity.

Activity	Joints tracked	Reference
Pointing in a direction	/left_hand	/torso
	/left_elbow	/torso
	/left_hand	/torso
Sitting on a chair and drinking from bottle	/right_elbow	/torso
	/right_hand	/torso
	/left_hand	/torso
Picking an object from ground	/right_hand	/torso
	/head	/torso
	/right_shoulder	/torso
Sit-stand exercise	/right_foot	/torso
	/left_foot	/torso
	/left_knee	/torso
Checking wrist watch	/left_hand	/torso
	/left_elbow	/torso
	/left_hand	/torso
Waving hello	/right_hand	/torso
	/right_elbow	/torso
	/right_elbow	/torso
Handshake between two individuals	/right_hand	/torso
	/right_hand_2	/torso_2
	/right_elbow	/torso
Dead ball signal	/right_hand	/torso
	/left_hand	/torso
	/head	/torso
Four signal	/right_hand	/torso
	/right_elbow	/torso
	/right_elbow	/torso
Leg bye signal	/right_hand	/torso
	/right_knee	/torso
	/right_knee	/torso