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中文摘要：
文中提出了一种基于聚类模版匹配的抗聚类的数字水印算法。首先对要嵌入的消息进行RS纠错编码，以增加水印提取时的抗噪能力，然后在傅立叶普中频使用90。水印嵌入法嵌入水印，利用混沌系统产生随机数来确定图像DFT变换后水印嵌入的具体位置，最后进行对数极坐标变换，在其中嵌入聚类模板。实验结果表明，该算法对JPEG压缩和各种几何攻击都具有较好的鲁棒性。
英文摘要：
This paper proposes an geometric attack-resistant digital image watermarking based on clustering template matching. First, the watermark message is coded with RS-code to enhance the noise-resistant capability in extraction of watermaking. Then, the message is embedded in the mid-frequency spectrum of DFT by using 90~ embedding method, and the positions are determined by some random numbers produced by chaotic system. Finally, a cluster template is embedded in Log-Polar region, thus rectify the picture when extraction happens. The experiment results indicate that this technique is robust in resisting various geometrical attacks and JPEG lossy compression.
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