Tristan Roussillon Laure Tougne Isabelle Sivignon Computation of Binary Objects Sides Number using Discrete Geometry, Application to Automatic Pebbles Shape Analysis. 763-768 2007 conf/iciap/2007 ICIAP http://doi.ieeecomputersociety.org/10.1109/ICIAP.2007.44 db/conf/iciap/iciap2007.html#RoussillonTS07