An image digital watermarking based on DCT in invariant wavelet domain

Surviving geometric attacks in image watermarking is considered to be of great importance. In the face of geometrical attacks, all shortcomings of almost all digital watermarking algorithms have been exposed This paper presents an improved invariant wavelet that is, better than the bilinear interpolation and whose performance is close to of bicubic when scaling factor very close to 1, and designs a novel blind image watermarking algorithm based on DCT in the Rotation- and Scaling- and Translation- (RST) Xiong's Invariant Wavelet, i.e. RSTXIW domain. The experiments show that this novel watermarking algorithm is robust against filter, noise and arbitirary RST geometrical attacks, however, sensitive to local crop attacks.