数字图像水印嵌入强度的矩估计方法  

Moment Estimation of Embedding Strength for Digital Image Watermark

作　　者：金聪[1] 彭嘉雄[1] 

机构地区：[1]华中科技大学图像识别与人工智能研究所

出　　处：《计算机辅助设计与图形学学报》2004年第5期691-696,共6页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然基金 (F6 0 0 850 0 2 );中国科学院信息安全国家重点实验室开放课题基金 ( 0 3 0 2 )资助

摘　　要：在水印图像是均值为零的随机二值序列、原始图像是服从Weibull分布 (具有参数α和 β)的独立同分布随机序列的条件下 ,对于原始灰度图像 ,水印嵌入强度的估计问题可归结为对隐秘图像和原始图像灰度平均值的简单计算的问题 提出矩估计方法 ,实验结果证实了该方法的有效性 对加法、乘法和融合三种嵌入规则的性能进行了比较和分析 。Under the assumptions that gray scale watermark data may be summarized as a known, zero mean, binary valued sequence and the original image data as an independently and identically distributed random sequence from a Weibull distribution, we show that this embedding strength should be estimated through simple computations based on the average gray scales of both the watermarked image and original image An approach based on moment estimation is presented Experimental results show that this approach is effective for De Rosa et al 's watermark detector Moreover, according to the embedding rules of addition, multiplication and fusion, we also compared and analyzed their performance using PSNR Conclusions obtained from experiments are useful to the further research

关 键 词：数字水印 矩估计方法 嵌入强度 灰度平均值 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]