Digital Image Watermarking Algorithm Resistant to Geometric Attacks in Wavelet Domain

摘要

To solve the sensitive problem of signal processing and geometric distortion of digital image watermarking, an image watermarking algorithm against geometric attacks was proposed in the paper. After decomposing the whole image with 3 level of discrete wavelet transform and transforming the watermark image by Arnold shuffling, embed the watermark data to the media frequency coefficients of wavelet domain according to the conceal quality of Human Visual System (HVS); and extract two invariant centroids as factors to correcting geometric transformation by using the theories of invariant centroid, the watermarked image could be corrected. The experimental results show that the algorithm is robust to general signal processing and geometric attack such as rotation, scaling and translation.