基于小波变换的自适应公钥数字水印

利用小波变换良好的时频局部特性,提出了一种基于小波变换的自适应公钥数字水印设计方案。数据的所有者利用私钥向数据中嵌入版权信息,任何数据使用者可以利用公钥从接收到的数据中提取版权信息。水印的嵌入强度可根据原始图像自身的特点自适应调节,水印的提取也不需要原始图像。实验结果表明该算法具有良好的不可视性和抗联合图像专家组压缩、剪切、滤波等攻击的能力。

A Wavelet Based Adaptive Public Key Watermarking Algorithm

A wavelet-based adaptive public key watermarking algorithm is presented in the paper. Data owner can use his private key embed the identification into the local image and retrieve it from the watermarked image. The data users can use the public key detect the identification from the watermarked image. How much the embedding strength is adjusted adaptively to the local image characteristics. The experimental results have shown that the proposed watermark is invisible to human eyes and very robust to joint photographic experts group compression attack, crop attack and so on.