DCT-based Image-adaptive Digital Watermarking Embedded and Anti-geometric Attack Dual Detection Method

摘要

It is a pre-request for digital watermarking, which are used to detect and trace copyright violations, is that it can robust to many kinds of unintentional or intentional attacks. The robustness against geometric attacks remains one of the most challenging issues in watermarking of images. This paper presents a digital image wat rmarking method, which not only robust to the common attacks, but also robust to the geometric attacks. This method composed of three modules: watermark embedding module, anti-geometric module and wat rmark detection and extraction module. The embedding module manipulates a binary pattern as watermark, embedded its modulate form in DCT domain and makes watermark image-adaptive. This embedding method also can be used for blind-detection. This embedding method is robust to several image processing techniques including JPEG compression, median filtering and additive noise. The second module presents an anti-geometric attack method, which use non-insert template matching, which outperform the template insertion method in the aspect of payload embedding. At last the correlation detection method was adopt to dete t the existing watermark.