一种倒谱变换的数字水印

A New Digital Watermarking Algorithm Based on Incepstrum

提出了一种基于一维倒谱变换和混沌加密的数字水印新算法。倒谱域水印算法克服了水印嵌入时频段选择的限制,增大了水印嵌入的信息量,避免了块效应。文中利用置乱和混沌系统的特性对水印图像预先进行加密,更加提高水印的保密性和鲁棒性,实验结果表明:该算法对于JPEG压缩、剪切、加噪等方面都有很好的抗攻击性。

This thesis is concerned with a new digital image - watermarking algorithm, which is based on 1 - dimension cepstrum transformation and chaotic encrypting system. This method used for copyright protection demonstrates improved robustness against JEPG compression, image cropping, scaling, noising, and so on, in comparison with existing watermarking algorithms. The original image and key are needed to extract the watermarking signal.