基于小波变换的数字水印嵌入技术研究  

Research of the Digital Watermarking Embedding Technology Based on the Wavelet Transform

作　　者：武莎莎[1] 姚敏[1] 赵敏[1] 

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《淮阴工学院学报》2011年第3期8-11,共4页Journal of Huaiyin Institute of Technology

摘　　要：以静态数字图像为主要研究对象,提出一种采用载体和水印图像进行同步小波变换的水印嵌入算法。为了获得较好的嵌入效果,在同步分解的方法中采用重复嵌入方式。首先对载体和水印图像进行小波分解,然后将水印低频嵌入到载体图像第二层低频,最后将水印中频和高频对应嵌入至载体图像的中频和高频。采用该算法嵌入时保持嵌入强度、噪声强度不变,与载体单一分解算法进行对比。实验结果表明:该算法对高斯噪声具有良好的隐藏性和鲁棒性。In this paper,the static digital images are studied.An embedding watermarking algorithm is proposed.The watermark image transferred based on wavelet transform domain is introduced.In order to improve the embedding effect,the way of repeated embedding is used in the synchronous decomposition.Firstly,the carrier and the watermark image are decomposed by the wavelet transformation.Then,the low-frequency of watermark is embedded into the second low-frequency of the carrier image.Finally,the medium and high frequency of the watermark are inserted into the medium and high frequency of the carrier image correspondingly.The processing of embedding keep the embedding intensity and the noise strength unchanged.Comparison is made between the proposed algorithm and the single decomposition algorithm.Experimental result demonstrates that the presented scheme achieves better invisibility and robustness by the attack of Gaussian noise.

关 键 词：数字水印 小波变换 同步 重复嵌入 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]