Detecting image spam using local invariant features and pyramid match kernel.

Haiqiang Zuo Weiming Hu Ou Wu Yunfei Chen Guan Luo Detecting image spam using local invariant features and pyramid match kernel. 1187-1188 2009 WWW http://doi.acm.org/10.1145/1526709.1526921 conf/www/2009 db/conf/www/www2009.html#ZuoHWCL09