Table 1.

Decision rules for recognizing the types of behavior in Class 2.

Decision rules
Rule 1 (Lying down)	If (“Condition 1 * is TRUE”) : Lying down Else : Go to Rule 2
Rule 2 (Kicking)	If (“M is leg tip” and “Condition 2 * is TRUE”) : Kicking Else : Go to Rule 3
Rule 3 (Hand waving)	If (“M is hand tip” and “Condition 3 * is TRUE”) : Hand waving Else : Go to Rule 4
Rule 4 (Punching)	If (“M is hand tip” and (“Condition 4 * or Condition 5 * is TRUE”)) : Punching Else : Go to the rule (for checking running, walking or undetermined case as shown in the right lower part of Figure 3)

* Condition 1: Average R of Equation (2) is less than two thresholds (T_r2 and T_r3) as shown in Figure 3; * Condition 2: both X and Y positions of M point are higher than threshold; * Condition 3: The position of M is changed in both X and Y directions in recent N frames as shown in Figure 10a; * Condition 4: The position of M is increased in both X and Y directions in recent N frames as shown in Figure 10b; * Condition 5: The position of M is increased only in the Y directions in recent N frames as shown in Figure 10c.