应用Hash函数增强数字图像半易损性水印的易损性  

Improving Fragileness of Semi-fragile Digital Watermarking by Using Hash Function

作　　者：张中月[1] 齐开国[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026

出　　处：《计算机辅助设计与图形学学报》2004年第6期845-849,共5页Journal of Computer-Aided Design & Computer Graphics

摘　　要：提出了一种空间域、小波域相结合的数字图像半易损性水印算法 ,该算法在图像的小波变换域嵌入基于图像内容的Hash值 实验表明 ,该算法可以抵抗一定程度的JPEG压缩 。In this paper a novel method of semi-fragile digital watermarking is proposed based on both spatial and discrete wavelet transform domain. In order to improve the fragileness of watermark, the wavelet transform domain of the image is embedded with the Hash value based on the original image. The experimental results show that this algorithm is robust to JPEG compression. It can distinguish low-grade JPEG compression from the tampering of a small amount of pixels the original image especially.

关 键 词：半易损性水印 图像内容 小波变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]