Most present algorithm of watermarking based on spread spectrum compare the extracted watermarks with the origin watermarks and it is a non-blind watermarking.
在已有的算法中大部分是利用相关判断水印的有无，而且需要水印拷贝，不是盲检测。
参考来源 - 扩频技术在数字水印中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Secondly, the author puts forward a Blind Watermarking Algorithm basing on DCT Domain and Chaos.
提出了一种基于混沌的DCT域盲数字水印算法。
It's difficult to detect blindly the image rotation Angle in blind watermarking under geometry attack.
抗几何攻击的盲检测数字水印的难点是图像旋转角度的盲检测。
The fundamental of blind watermarking is designed to retrieve to the embedded information without referring to the host data.
盲水印的基本思想是恢复嵌入信息时，不需参考主数据。
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