Hello Dear, I cannot access to the source code of the "region_adjacency_graph" through the available link: (https://trac.lrde.org/olena/browser/milena/demos/graph/region_adjacency_grap..., can you send it for me. Best regards, GHAZOUANI FethiPhd Student in Computer ScienceRIADI Laboratory, ENSI Manouba, Tunisia