一种基于小波变换的数字水印算法

为了解决数字媒体的版权保护问题,提出了一种基于小波变换的鲁棒水印算法.借鉴嵌入式零树小波编码的基本思想,结合小波零树结构来选择水印的嵌入位置,并计算其嵌入强度.研究结果表明:本算法具有较强的鲁棒性和透明性,可以抵抗各类常见的攻击,尤其对于JPEG有损压缩和锐化处理表现出了较强的鲁棒性.该成果对数字媒体的认证工作具有一定的参考价值.

A digital watermarking algorithm based on wavelet transformation

In order to protect the digital media’s copyright,a robust watermarking algorithm based on wavelet transformation is presented in this paper.The algorithm mainly applies the basic idea of embedded zero-trees wavelet.The watermark’s embedding position is determined based on the zero-trees structure.Also,the intensity of embedment is calculated.The study result demonstrates that this algorithm is robust and imperceptibility.It can resist all kinds of normal attacks,especially much more robust for the JPEG loss compression and the sharpening treatment.This study results provides some valuable references for future authentication of digital media.