Projective-invariant digital image watermarking technique using four co-planar feature points.

Nopporn Chotikakamthorn Natapon Pantuwong Wiyada Yawai Projective-invariant digital image watermarking technique using four co-planar feature points. 1005-1008 2005 ICIP (1) http://dx.doi.org/10.1109/ICIP.2005.1529923 db/conf/icip/icip2005-1.html#ChotikakamthornPY05