Binary Images of Sheared Rock Joints: Characterization of Damaged Zones Joëlle Riss, Sylvie Gentier, Katia Laffréchine, Rock Flamand and Guy Archambault Microsc. Microanal. Microstruct., 7 5-6 (1996) 521-526 DOI: 10.1051/mmm:1996153