中文摘要：

针对数字水印透明性和鲁棒性之间的矛盾，提出了基于二维超混沌映射的强鲁棒性数字水印算法，通过对水印图像进行超混沌加密，生成水印序列，该序列具有混沌系统的初值敏感性。同时结合二级离散小波变换（DWT）对载体图像进行分块处理，在图像块与水印序列行之间建立对应关系，选择合适的中低频系数嵌入水印bit值。仿真实验表明改进算法在保证水印安全性的前提下，能够有效地抵抗噪声、滤波、几何攻击，表现出较强的鲁棒性，适用于数字信息的版权保护。

英文摘要：

For the contradiction between the transparency and robustness of digital watermark, a new digital watermarking algorithm based two-dimensional hyper-chaos mapping is proposed. Firstly,watermark image is encrypted throughing hyper-chaos mapping,generating watermark sequences with chaos system initial value sensitivity. Then, the image is partitioned according to the DWT.Corresponding relationship is established between the image block with a watermark sequence. Finally,watermarking sequences are embedded into DWT coefficient of each image block according to the binary value of watermark image. Experiment shows that the proposed algorithm is able to withstand a variety of attacks and ensure watermark security.It shows the strong robustness,is suitable for the copyright protection of digital information.