Wavelet based watermarking detection using multiresolution image registration

Due to the lack of invariant property of discrete wavelet transform (DWT), the DWT based watermarking schemes are relatively vulnerable to the watermarking attacks such as geometric variations (ie., rotation and translation etc.). To improve the reliability of the DWT based watermark detection, this paper introduces the new multiresolution based image registration method that is used to recover the geometrically distorted image before detecting the watermark. Since the proposed registration method does not require either the original image or any control point (invariant feature), it can be implemented by the blind-based DWT based watermarking scheme. Simulation results show that the proposed registration method provides the further improvement of the DWT based watermark detection process.