关键词: 图像水印, 几何攻击, 正交矩, 傅里叶-梅林矩

Abstract: One of the hottest issues in the research areas of digital image watermarking is how to effectively resist geometric distortions. An imperceptible geometric attack can even make the vast majority of the watermarking algorithms become invalid. On the basis of the theory of invariant moments and Fourier-Mellin moments, the paper proposes a new method on image watermarking, tending to resist geometric distortions more effectively. Following the principle of invariance to geometry, the characteristics of Fourier-Mellin moments, the Fourier-Mellin moments of the original image are calculated. A part of stabilized Fourier-Mellin moments are selected according to the rules of stable moments, and the watermark information is embedded into the amplitude by quantitative modulation strategy. It reconstructs the different images before and after modification, and adds them to the original carrier image, the new watermarked image will be gained. Simulation results show that the proposed method not only has the nature of better imperceptibility, but also has an excellent robustness to the conventional signal processing and geometric distortions.

Key words: image watermarking, geometric distortions, orthogonal moments, Fourier-Mellin moments