Algorithm 2. Editing joint connections.

1. Input: $skeletons=\{bod{y}_i\{j:(x_{joint\_j},y_{joint\_j}),j=[0,17]\},i=[0,n-1]\}$                $boxes\_object=\{bo{x}_i(x_1,y_1,x_2,y_2),i=[0,m-1]\}$                n: number of skeletons

2.   Output: $new\_skeletons=\{bod{y}_i\{j:(x_{joint\_j},y_{joint\_j}),j=[0,17]\},i=[0,n-1]\}$

3.   $new\_skeletons=skeletons$

4.   for ($index\_body$, $body$) in enumerate($skeletons$):

5.         for $joint$ in $body$:

6.     if not(belong_to_area($boxes\_skeleton[index\_body],joint$)):

7.        $new\_skeletons$.remove($joint$)

8.        $new\_skeletons$.remove(all connections of joint)

9.   return $new\_skeletons$