Dan Wang Peizhong Lu Geometrically Invariant Watermark Using Fast Correlation Attacks. 465-468 2006 conf/iih-msp/2006 IIH-MSP http://doi.ieeecomputersociety.org/10.1109/IIH-MSP.2006.106 db/conf/iih-msp/iih-msp2006.html#WangL06