Figure 4.

Representative self-occlusion images in direct, left or right view of Kinect sensors. (a) in the direct view, the rear ankle joint E is occluded whereas not in the right view; (b) in the direct view, the left wrist joint E is occluded when the body twisted, whereas not in the right view; (c) in the right view, the joints E1 and E2 are occluded, whereas not in the left view; (d) in the left view, joints E1 and E2 are occluded whereas not in the right view.