Roberto Caldelli Alessia De Rosa Rudy Becarelli Mauro Barni Coping with local geometric attacks by means of optic-flow-based resynchronization for robust watermarking. 164-174 2005 conf/sswmc/2005 Security, Steganography, and Watermarking of Multimedia Contents db/conf/sswmc/sswmc2005.html#CaldelliRBB05