22. The media material analyzer of claim 21 , wherein the layout transition analyzer finds another pair of candidate block segments aligned in a horizontal direction based on horizontal transition features in the layout to determine whether the another pair of candidate block segments belong to a same article in the media material.
21. The media material analyzer of claim 20 , wherein the layout transition analyzer finds a pair of candidate block segments aligned in a vertical direction based on vertical layout transition features and determines whether the pair of candidate block segments belong to a same article in the media material.