Djamal Boukerroui J. Alison Noble Michael Brady Feature Enhancement in Low Quality Images with Application to Echocardiography. 453-460 2001 conf/ipmi/2001 IPMI http://dx.doi.org/10.1007/3-540-45729-1_48 db/conf/ipmi/ipmi2001.html#BoukerrouiNB01