基于小波树的鲁棒—脆弱图像水印技术

为了实现数字图像的版权保护和篡改检测功能,提出一种鲁棒-脆弱水印算法.在小波变换后的图像中,由逼近子带的系数构造特征水印,并根据小波零树思想,嵌入到重要小波树的第一主分量中.提取的特征与水印进行比较不仅可确定图像的版权,而且可证明内容的完整性.实验表明,此算法不仅可以抵抗滤波、压缩、加噪、重量化等常见的图像处理操作,且在人的参与下,可以较好的定位图像的篡改.

A Robust-Fragile Image Watermarking Technique Based on Wavelet Tree

To achieve both the copyright protection and tamper detection of digital image,we present a robust-fragile watermarking algorithm,which exploits coefficients in approximate subband of the wavelet transformed image to generate the feature,then exploiting wavelet zerotree,embeds it into the first principle components of the vital wavelet trees.Comparing the extracted feature and watermark can identify the image's authority and detect the content integrity.Experiments show,the algorithm can resist filtering,compression,adding noise,re-quantization,etc.,while it can locate the tamper with man's intervention.