Affiliations: Department of Information Management, Chaoyang
Univerity of Technology. klhung@cyut.edu.tw
Note: [] Address for correspondence: 168 Jifong E. Rd., Wufong Township
Taichung County, 41349, Taiwan (R.O.C.)
Abstract: This work, proposes a robust digital watermarking scheme based on
feature points as a defense against illegal user attacks, such as, rotating,
scaling and translation. First of all, a Gaussian filter is first adopted to
discover the invariant feature points. The local maximum and the local minimum
values are then calculated from those feature points. The Affine Invariant
Region (AIR) is then divided by combination the values: local maximum, local
minimum values and the center of mass. The AIR region is then transformed using
affine transform to a block image, called the normalized image, in which the
size of the block image is predefined. The watermarks are then embedded into
the normalized image. Experimental results indicate that the proposed method
can still extract the correct watermark, even after a geometric attack. The
proposed method has a lower false positive rate and higher accuracy than
Lu's [12] that making it a robust blind watermarking scheme.
