Research digital image copyright protection problems. The current watermarking algorithm can resist simple geometric attacks, but cannot e effectively resist various complex geometric attacks, and it is difficult for good protection of digital image copyright. In order to better protect copyright of digital image, this paper presented a novel image normalized watermarking algorithm. Through the normalized processing for original image and attacked image, the watermark and image were kept synchronous in the process of embedding and extracting, so as to improve the a-bility of resisting geometric attacks. The simulation results show that based on image normalized watermarking algorithm can resist various geometric attacks very well, and improve the robustness of digital watermarking resisting geometric attacks.%研究数字图像版权保护问题,数字水印要求不可复制、防攻击等特性.针对传统数字水印算法不能很好的抗几何攻击,为了更好对数字图像版权进行保护,提出一种图像归一化技术的数字水印算法.通过对原始图像和攻击后的图像的归一化处理,使水印和图像在嵌入与提取过程保证同步,提高数字水印抵抗几何攻击的能力.仿真结果表明,图像归一技术的水印算法能够很好抵抗各种几何攻击,提高了数字水印抗几何攻击的鲁棒性,为保护版权提供了参考.
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