一种DCT域数字图像半脆弱水印方法

内容认证是数字水印的主要用途之一,依据选择认证的特点和JPEG压缩原理,结合适当的样本选取方法提出了一种能承受JPEG压缩的半脆弱水印嵌入方法.水印信号为利用混沌序列生成的二值序列,水印的嵌入位置由密钥决定,具有非常好的安全性;水印的提取和图像认证不需要原始图像.实验表明,该方法嵌入的水印不可见性好,水印可以从严重的JPEG压缩中保存下来,对滤波和加噪等处理具有很好的易碎性,适合于图像的选择认证.

Digital image semi-fragile watermarking algorithm in DCT domain

Image authentication is one of the main purpose of watermark. A digital image semi-fragile watermarking algorithm is presented based on the elements of JPEG and the choice swatch method. The watermark is a binary sequences based on chaotic sequences; and use key to determine the position of watermark in the image, which can assure very good security for the watermark. The watermark is extracted without the origial unmarked image. The experiments show that the algorithm can assure good imperceptibility for watermarked image and the watermark embedded using the algorithm has good semi-frangibility against the familiar attacks, and beseem to selective authentication for image.