【Key words】 Digital watermarking； Geometric attack； Watermark synchronization； Invariant moment； Feature point； Image normalization；
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Two watermark synchronization schemes are proposed based on the Harriscorner detector.
3.提出了两种基于Harris特征点的水印同步方案。
参考来源 - 数字水印抗几何攻击理论及应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The main methods adopted include:1) watermark synchronization is achieved by invariant local circular regions which can be generated using image locally most stable feature points;
采取的主要方法有：1）利用图像中的局部最稳定特征点生成具有几何不变性的圆形特征区域，用于水印的同步；
In the extract process, through the decoding of the synchronization code to locate the position of the watermark signal embedded in the frame as well as data starting position.
在提取过程中，通过对同步码的解码来定位水印信号嵌入的帧位置以及数据起始位置。
The features of the proposed algorithm are as follows: (1) Synchronization code is embedded into audio with the watermark, and the watermark thus generated has the ability of self synchronization.
该算法具有如下特点：（1 ）在隐藏水印信息的同时，嵌入一个同步信号，使水印具有自同步能力；
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