一种改进的新型图像水印系统的设计和实现  

Design and implementation of improved watermarking system for image

作　　者：冯战申[1] 平源[2] 

机构地区：[1]许昌学院数学系,河南许昌461000 [2]许昌学院计算机科学与技术学院,河南许昌461000

出　　处：《计算机工程与设计》2006年第8期1354-1356,共3页Computer Engineering and Design

基　　金：河南省自然科学基金项目(0411013000);河南教育厅自然科学研究基金项目(2004601088)

摘　　要：结合改进的密码学算法和协议,设计了一种可扩展授权恢复机制的新型图像水印系统。把图像小块后的水印信息进行移块重组为二值水印图像,利用混沌映射使二值图像分散,很好的扩展了水印空间,并避免了水印像素相关性问题;使用改进的共享与授权协议来规范混沌参数的使用规则,增强抗水印穷举攻击能力,提高了系统的安全性。实验表明本系统较好的实现了可扩展授权恢复的安全机制。Combine the improved cryptography algorithm with it＇s protocol, a new watermarking system is designed, which possesses extensible mechanism. The image is divided into some small blocks. And it is quantized and encoded to obtain watermarking information which are shifted and regrouped for a binary watermark image, which is separated by chaotic map algorithms to enlarge watermark space, and the relativity problem of watermark pixel is avoided. The parameter of chaotic map algorithms are disposed by the improved sharing and authorization protocol, the exhaustion attack ability of watermark-resistant and the security for the system are enhanced. Experiment show that the an extensible authorization and recuperative security mechanism are realized preferably.

关 键 词：水印 多媒体认证 授权 二值图像 混沌映射算法 信噪比 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]