易损数字水印若干问题的研究  

Research on Fragile Watermarking Problems

作　　者：华先胜[1] 石青云[2] 

机构地区：[1]北京大学数学科学学院信息科学系,北京100871 [2]北京大学信息科学中心视觉与听觉处理国家重点实验室,北京100871

出　　处：《中国图象图形学报（A辑）》2001年第11期1089-1095,共7页Journal of Image and Graphics

基　　金：国家重点基础研究发展规划资助项目 (G19980 3 0 60 6)

摘　　要：易损数字水印算法可用于多媒体内容真实性的保护 .为更有效地设计和使用易损水印 ,首先通过研究其算法应具有的特点及易损水印与鲁棒水印的差别 ;然后在可信赖的数码相机这个应用背景的基础上 ,提出了一个简单的易损水印应用框架 ;最后 ,讨论了变换域易损图象数字水印算法的误差问题和逆变换后象素值溢出的问题 ,同时给出了两种解决方法 。In this paper, we discuss several problems on fragile watermarking, which is used to ensure the credibility of multimedia. Firstly, we describe some main properties that an efficient fragile watermarking scheme should have. And then we discuss the differences between robust watermarking and fragile watermarking algorithms, which are important for us to develop efficient fragile watermarking scheme. Thirdly, a simple application framework for fragile watermarking, which is called trustworthy digital camera, is proposed. This fragile watermarking framework can be used for ensure facticity for images taken by digital camera. In the end, we present two approaches, pre processing and using integer transform, to solve round off error and overflow error problems for frequency domain fragile watermarking techniques. Experimental results show that these two approaches are efficient for improving other fragile watermarking algorithms.

关 键 词：数字水印 易损水印 认证 多媒体内容 鲁棒水印 鲁棒性 

分 类 号：TP37[自动化与计算机技术—计算机系统结构] TP391.4[自动化与计算机技术—计算机科学与技术]