Jamal Malki Laurent Mascarilla El-Hadi Zahzah Patrice Boursier Directional Relations Composition by Orientation Histogram Fusion. 3766-3765 2000 ICPR http://csdl.computer.org/comp/proceedings/icpr/2000/0750/03/07503766abs.htm db/conf/icpr/icpr2000-3.html#MalkiMZB00