What do we expect from comic panel extraction?

Among comic elements including panels, balloons, comic characters, texts, etc. panels play an important role in content adaptation and story animation for small devices such as mobile phones or tablets. Different panel extraction techniques have been investigated over the last ten years; most of existing approaches rely on the assumption that a comic panel is either simple as a rectangle or more complex as a polygon having 4 edges. In this paper, we re-examine the definition of comic panels, is a 4-edge polygon really sufficient to represent integral information of a comic panel? We suggest using a modern definition of comic panels, together with a strong panel extraction baseline method for the approach.