关键词: 数字水印, 几何攻击, 尺度空间, 鲁棒性

Abstract: In view of digital watermarking algorithms are difficult to deal with some synchronization attacks and composite geometric attacks, this paper proposes a digital watermarking method based on the steady feature area and feature points. It extracts balanced feature points by changing the scale space of corner in Harris-Laplace algorithm. Then, feature direction is decided by gradient factor. Next, it selects invariable feature area according to the steady feature points and feature direction. Finally, watermark is inserted in the feature area. This method can enhance the resistance of the general geometric attacks and composite attacks in data watermarking system. The conducted results demonstrate that the proposed algorithm not only can effectively reply the images that are suffer from geometric attacks, but also avoid the embedded watermark information outside the extracted feature extraction, and it is provided with better robustness.

Key words: digital watermarking, geometric attack, measure space, robustness