Robust Digital Image Watermarking Technique
As a main method for copyright protection,the watermarking technique has been a hot topic for research.But there are few methods of practical robust digital watermarking,especially in the case of geometrically robust watermarking.Using translation,rotation,scaling invariant property,good local characteristics and excellent reconstruct ability of Krawtchouk moments,the robustness to the cropping of lower Krawtchouk moments are combined to obtain the watermarked image by modifying some selected moments according to the length of the watermark bits.With Rijndael encryption,Arnold transformation and the constructed invariant feature matrix,a related binary logical table is produced for copyright protection.The experimental results show that the embedded watermarking is effectively robust to the common attacks such as JPEG compression,cropping and added noise,as well as the geometric attacks such as translation,rotation and scaling.