基于小波变换的图象自适应水印  

Image-adaptive Watermark Based on Wavelet Transform

作　　者：胡玉平 

机构地区：[1]娄底师专计算机系

出　　处：《娄底职业技术学院学报（职教与经济研究）》2003年第2期34-38,共5页

摘　　要：本文提出了一种基于小波变换的图象自适应水印嵌入方法。此方法对原始图象进行小波分解，在每个低频系数中嵌入一位水印信息，嵌入时根据低频逼近系数和高频系数的特点以及树结构关系，给每一个低频系数确定一个相关掩蔽参数，并用此参数控制其对应低频系数嵌入水印时的相对修改强度，实验表明：使用该方法嵌入的数字水印具有很好的隐蔽性，感觉不到对原始图象的影响。同时，嵌入的数字水印具有较理想的鲁棒性，常规的图象处理方法对其影响甚弱。In this paper, an embedding method of image-adptive watermark based on wavelet transform is proposed. With this method, the original image is decomposed by wavelet transform and a bit of watermark information is embedded in every lowest approximation coefficient. Before the watermark is embedded, a correlation mask for every lowest coefficient is confirmed by the characteristic and tree structure relation of the wavelet coefficients. Then, the modified value of every lowest coefficient is controlled by its corresponding mask. The experimental results show that the embedded digital watermarks with this proposed method are invisible and also possess robust enough against the commonly used image processing techniques.

关 键 词：数字水印 小波变换 鲁棒性 不可见性 图象自适应水印嵌入方法 图象处理方法 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论] TP391.41[自动化与计算机技术—计算机科学与技术]