基于预测信息的空域水印改进算法  

Improved Algorithm of Spatial Watermarking Based on Predictive Information

作　　者：刁俊峰[1] 张颖[2] 温巧燕[1] 

机构地区：[1]北京邮电大学理学院,北京100876 [2]河南工业大学机电工程学院,河南郑州450007

出　　处：《无线电工程》2009年第3期19-21,共3页Radio Engineering

摘　　要：在图像的空间域中,一些像素与它相邻的像素之间存在一定的相关性,可以通过相邻的像素值来构建对这些像素的预测信息。基于此特点提出了一种利用参考像素点的预测信息来嵌入水印的方法,设计了重复嵌入水印的方案,通过阈值来控制嵌入水印的强度,分析了阈值对嵌入容量的影响。仿真结果表明,改进后的算法具有更高的水印容量,提高了抵抗剪切和噪声攻击的鲁棒性,且不依赖宿主图像的信息就可提取水印。Many pixels are relative to their neighbor pixels in the spatial domain,so it can construct predictive information by using the neighbor pixels＇ value.Based on this character,a spatial watermarking using the predictive information of the reference pixels is proposed.The scheme of embedding repetitious watermark is designed,which controls the strength of the watermark by using the threshold value.The threshold＇s influence to the watermarking capacity is analyzed.The experimental results indicate that the proposed method yields higher capacity and robustness;it can resist the cropping,white noise attack,not requiring the host image information to recover the watermark.

关 键 词：水印 空域 相邻像素 阈值 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]