一种加密域数字图像水印方法

数字媒体版权保护已变得十分迫切和必要，有效的盗版确认方法是实现有效版权保护的前提；结合加密方法提出了一种有效的盗版确认数字图像水印方法，水印信号为二值图像，水印的嵌入在图像加密域进行，具有非常好的安全性；水印提取在水印图像加密域进行且不需要原始未加水印图像。实验表明，该方法嵌入的水印不可见性好，对JPEG压缩、图像剪切和图像加噪声等攻击具有较好的鲁棒性。

Digital image watermarking algorithm in encryption domain

The copyright protection of the digital multimedia has become an impending issue. The effective pirate validation of the digital multimedia is the precondition for effective copyright protection. A digital image watermarking algorithm for the pirate validation is presented based on the encryption method. The watermark is a binary image and embedded into the image in encryption domain of the image by the algorithm, which can assure very good security for the watermark. In the watermark extraction, the watermark is extracted from encrypted watermarked image without the original unmarked image. The experiments show that the algorithm can assure good imperceptibility for watermarked image and the watermark embedded using the algorithm has good robustness against the attacks such as JPEG compression, image shearing and noise addition.