一种综合空域和时频域的数字水印算法  

Digital Watermark Algorithm Integrated with Space Domain and Time-frequency Domain

作　　者：李敏[1] 

机构地区：[1]乐山师范学院物理与电子工程学院,四川乐山614000

出　　处：《计算机工程》2011年第20期120-122,126,共4页Computer Engineering

基　　金：乐山师范学院自然科学基金资助项目(Z1039)

摘　　要：提出一种空域和时频域相结合的多分辨率灰度图像水印算法。该算法对原始载体图像进行离散小波分解,并对灰度水印图像先进行拉普拉斯金字塔分解再进行位平面分解。将水印图像位平面分解系数嵌入到原始图像的水平和垂直分量上,水印嵌入小波系数的位置由具有混沌特性的Arnold映射确定,从而实现水印的盲提取。实验结果证明,该算法对图像的普通处理,如噪声、滤波、剪切、JPEG压缩和旋转等,均具有较好的鲁棒性。Based on space and time-frequency,a multi-resolution gray image watermarke algorithm is proposed.For the original carrier image,it is decomposed by Discrete Wavelet Transform（DWT）.For the watermarke,it is decomposed by Laplacian pyramid transformation,and is decomposed by bit-plane.After that the coefficients of the bit-plane decomposition are embedded in each layer in the horizontal and vertical components of wavelet decomposition.The chaotic Arnold mapping is utilized to generate the watermarking embedding position in order to enhance the security of watermarke.Through the inverse transformation,the embedded digital watermarke is extracted.The watermarke can be extracted without the original image.Experimental results show that the proposed algorithm is robust to some image processing operations,such as noise attacks,filtering attacks,cutting attacks,JPEG compressing attacks and rotation attacks.

关 键 词：灰度图像水印 离散小波变换 拉普拉斯金字塔分解 位平面分解 ARNOLD映射 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]