具有可扩展授权恢复机制的新型图像水印系统

A New Watermarking System Resumed by Legit Users for Image with Extensible Mechanism

建立了一个具有可扩展授权恢复机制的图像水印系统模型,先把图像小块划分后再使用DCT变换与量化编码,将得到的水印信息进行移块重组为二值水印图像,然后利用混沌映射算法使二值图像分散开来,极大地扩展了水印空间.另外,分析了传统水印算法安全问题,使用了改进的共享与授权协议来规范混沌参数的使用规则,提高了系统的安全性.

A new watermarking system model is established in this paper with extensible mechanism. The image is divided into some small blocks. Each block is DCT transformed, quantized and encoded to obtain watermarking information which is shifted and regrouped for a binary watermarking image. It is separated by chaotic map algorithms to enlarge watermarking space. In addition, the parameter of chaotic map algorithms are disposed by the improved commision and authorization protocol to enhance security, after analyzing security problem of conventional watermarking chaotic algorithms .