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。
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