Robust Watermarking in The DCT Domain Using Dual detection

In this paper, the discrete cosine transform domain (DCT domain) watermarking technique for copyright protection of still digital images is analyze and new watermarking method with dual detection is proposed. The DCT is applied in blocks of 8 times 8 pixels as in the JPEG algorithm. Previous DCT domain watermarking schemes proved to be very resilient against many attacks except for the geometric attack, especially rotation. Thus, these problems were tackled in our research to be overcome by using dual detection, which uses an equivalent form of the spatial version of the watermark embedded in the DCT domain as detection technique. In order to test the robustness of the algorithms, simple attacks such as filtering, JPEG compression, rotation, resizing and cropping were exploited