图像内容真实性认证的半易损水印方案研究  

Semi-fragile watermarking algorithm for image content authentication

作　　者：刘彤[1] 裘正定[1] 

机构地区：[1]北京交通大学信息科学研究所,北京100044

出　　处：《通信学报》2004年第5期138-142,共5页Journal on Communications

摘　　要：提出一种基于半易损的图像内容真实性认证方案。该算法既对不改变图像内容的一般性操作具有较好的顽健性,又能对改变图像内容的篡改操作具有较强的敏感性。在水印图像进行一般性处理后能够借助水印差别图和滑动窗检测并定位被篡改的区域。本文还从概率论的角度给出了精确的判决门限确定公式。仿真试验采用一般性操作和篡改操作相结合的方法,实验结果表明本文算法在保护数字图像内容真实性方面是可行的。A quantization-based semi-fragile watermarking algorithm for digital image content authentication is proposed. The algorithm is robust to incidental manipulations while fragile to malicious distortions. The tampered area of the watermarked image can be reflected in the watermarking difference map and a running window after the watermarked image is processed by common manipulations. The formulation of judging threshold is given from the point of probability theory. Experimental results show our semi-fragile watermarking algorithm is effective and practical for content authentication.

关 键 词：半易损水印 内容认证 易损性 顽健性 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]