小波包变换及其在数字水印算法中的应用

Wavelet-packet transform and it′s application in digital watermarking

在对小波包变换进行分析的基础上,将其应用在图像数字水印算法中.首先对图像进行小波包分解,并根据视觉感知特性将作为水印的二值图像嵌入到分解后的高频分量中,然后进行小波包重构得到嵌入水印的图像.实验表明,应用基于小波包变换的水印算法处理的图像能够经受常规的图像算法攻击,具有较强的鲁棒性和实用性.

In this paper,after analyzing to wavelet-packet transform,a robust watermarking algorithm for digital image is introduced.This algorithm manipulates the original image by wavelet-packet decomposability,then adds watermark onto the important wavelet coefficients located in the high frequency subband based on human visual system.The experiment results show that the watermarking is robust and practical to the common image processing techniques.