Real-Time Analysis of Human Body Parts and Gesture-Activity Recognition in 3D - 3D Modeling and Animation: Synthesis and Analysis Techniques for the Human Body - page 155

Figure 10. Example ellipsoids from front view: Hand left-right.
Figure 11. Example ellipsoids for “pointing camera1” activity from front
and side view.
camera view cannot find the activities such as pointing towards the camera, e.g.,
area change with time is not reliable for small body parts. However, the proposed
system combines the activity directions and body pose information from multiple
views and recognizes the correct activity in real-time.