Then we compute the watermark key using and and extract it.
再利用，算出水印密钥，进行水印提取。
Then we compute the watermark key using and s and extract it.
再利用，S算出水印密钥，进行水印提取。
The algorithms for the watermark embedding and extracting are both open, and public key cryptosystem is utilized instead of common watermark key.
水印的嵌入和提取算法都是公开的，公钥系统取代了普通的水印密钥。
However, in many applications it needs an asymmetric scheme, where a private key is used for watermark embedding, and a public key is used for watermark detection.
而许多实际的应用都要求非对称的数字水印方案，即水印嵌入时使用私人密钥，水印检测时只需要一个公开密钥。
It is a blind detection watermark since we detect watermark by position key and chaos sequence key without original image.
水印的相关检测只需要知道位置密钥和混沌序列密钥，不需要原始图像的参与，因而是盲检测水印方法。
When extracting the watermark, determine the extracting location in accordance with the key, extract the binary watermark and then recover the gray image watermark.
提取水印时，按照密钥确定水印提取位置，使用与嵌入互逆的方式提取二值水印，恢复为灰度水印。
Several different schemes have been proposed in the last few years, but most of them are symmetric, i. e. , the key used for watermark embedding is just the same used for watermark detection.
近年来提出了不少数字水印方案，但是它们中大部分都是对称的，即用于水印嵌入和水印检测的密钥是相同的。
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。
Because cutting operations may occur at any place in the picture, the key technique is to locate the watermark.
由于剪裁操作可能发生在图片的任意位置，因此水印信息的定位成为该方法的关键技术。
The watermark extraction used a public key corresponding to the private key in embedding procedure.
水印提取过程中使用与嵌入过程中私钥相对应的公钥提取水印信息。
The watermark extraction used a public key corresponding to the private key in embedding procedure.
水印提取过程中使用与嵌入过程中私钥相对应的公钥提取水印信息。
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