The key of digital watermark to copyright protection is the imperceptibility and robustness for embedded information.
用于版权保护的数字水印设计的关键是水印信息嵌入的隐蔽性和抵抗攻击的鲁棒性。
To embed the data effectively, firstly we research the embedded information and the embedding space, to see whether it matches or not.
要实现数据的有效嵌入，首先得对待嵌入信息和嵌入空间进行研究，看二者是否匹配。
Through comparing the experimental results, the imperceptibility of the embedded information has been improved to some extent.
通过实验对比，改进算法在增强隐藏信息的不可感知性上有一定提高。
Therefore, the embedded information, as required, should not interfere the normal use of the carrier data, and this is the hiding requirement of watermark technique.
因此，该技术要求添加到载体中的信息不破坏载体数据的正常使用，此即为水印技术的隐形性要求。
Therefore, the embedded information, as required, should not interfere the normal use of the carrier data, and this is the hiding requirement of watermark technique.
因此，该技术要求添加到载体中的信息不破坏载体数据的正常使用，此即为水印技术的隐形性要求。
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