HuAc: Human Activity Recognition Using Crowdsourced WiFi Signals and Skeleton Data

Figure 4

Skeleton structure [7]. (a) A skeleton structure contains 15 skeleton joints. (b) The white circle represents skeleton joints without direction such as shoulder and hip. The gray circle represents the neck and the torso which has a weak effect on the upper-body activity and the lower-body activity except the squat. The black circle represents normal skeleton joints.