一种基于Tchebichef矩的半脆弱图像数字水印算法  

A Semi-fragile Image Watermarking Scheme Based on Tchebichef Moments

作　　者：吕皖丽[1] 郭玉堂[1,2] 罗斌[1] 

机构地区：[1]安徽大学计算智能与信号处理教育部重点实验室／／计算机科学与技术学院,安徽合肥230039 [2]安徽省教育学院计算机科学与技术系,安徽合肥230061

出　　处：《中山大学学报（自然科学版）》2009年第1期16-21,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(60772122);安徽省高等学校省级自然科学研究重点资助项目(KJ2007A045;KJ2008A033)

摘　　要：提出了一种适用于图像内容认证的基于Tchebichef矩的半脆弱图像数字水印算法。水印嵌入时首先将图像分块,然后使用查找表法快速计算图像块的Tchebichef矩,最后通过修改每个图像块的Tchebichef矩来嵌入水印。水印提取过程是嵌入过程的逆过程,实现了盲水印提取。实验表明,算法透明性较好,对于常见的攻击,如JPEG压缩、加性噪声、小角度的旋转缩放攻击、亮度/对比度攻击以及高斯低通滤波等具有很好的鲁棒性。A novel semi-friagile watermarking algorithm based on Tchebichef moments is proposed. In the watermark embedding procedure, the image is divided into blocks fitstly. The Tchebichef moment of each block is computed rapidly with the help of look-up-table and modified to embed a watermark. The watermark extraction is the reverse progress of the watermark embedding withast its original image . Experimental results demonstrate that the proposed watermarking technique has a good vision performance and the robustness against some attacks such as JPEG compressing, noises, little rotation or scale, luminance or contrast enhancement and Gaussion low pass filtering. In the cut and paste experiments, the proposed algorithm can occurately locate the tempered positions. More importantly, the proposed scheme can locate where the paste comes from in the paste experiments.

关 键 词：数字水印 图像内容认证 TCHEBICHEF矩 离散正交矩 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]