the skeleton to describe the cartoon characters gesture.
First, we adopt discrete curve evolution to extract
skeletons of cartoon characters. Then, we calculate
relative angles between every two successive endpoints of
the skeletons and utilize these angles to describe the
cartoon characters’ gestures. For instance, we adopt two
successive endpoints (vi
k,vi
k+1 ) and the centroid ci of
character xi to construct the relative angle Ai
k.