This thesis starts with the mainframe of the digital watermarking system, and introduces the general methods of watermark embedding, watermark detecting and watermarking system attacking.
本文首先介绍了数字水印系统的一般框架，水印的各种嵌入和检测方法，水印的攻击方法。
The capacity upon threshold can be calculating. At last, the relationship is analyzed between watermark extraction error rate and watermark capacity in attacking scenario.
最后分析了有攻击情况下水印提取错误率与水印容量的关系。
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