基于多小波的高效数字水印算法  

An Efficient Digital Watermarking Algorithm Based on Multiwavelet

作　　者：李又良[1] 李泽平[2,3] LI You-liang, LI Ze-ping （1.Department of Mathematics and Computer, Hunan City University, Yiyang 413000, China; 2. The College of Science,Guizhou Uni- versity, Guiyang Guizhou 550025, China; 3. School of Computer Science ＆ Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China）

机构地区：[1]湖南城市学院数学与计算科学系,湖南益阳413000 [2]贵州大学理学院,贵州贵阳550025 [3]电子科技大学计算机科学与工程学院,四川成都610054

出　　处：《电脑知识与技术》2010年第10期8086-8087,8089,共3页Computer Knowledge and Technology

基　　金：贵州省自然科学基金号资助（（2003）3069）

摘　　要：结合多小波变换与离散余弦变换技术和分形技术，利用图像的视觉特征向量，提出并实现了一种新的鲁棒的图像水印算法。首先，对图像进行多小渡变换；然后，结合水印序列，对中低频系数进行分形编解码；接着，对解码后生成低频系数进行DCT变换；最后。提取其视觉特征向量，与水印共同生成水印提取密钥，完成水印的嵌入。实验结果说明本文提出的算法在JPEC压缩、滤波、噪声、旋转，缩放，弯曲等方面比同类算法有更好的鲁棒性。A new robust image watermarking algorithm of combining multi-wavelet transform and discrete cosine transfbrm and txactal techniques, using the visual feature vector of images, is proposed and implemented. First, multi-image wavelet transform is finished; and then, combined with the watermark sequence is, the low-frequency coefilcients are fractaUy coded and encoded; Moreover, decoded to the DCT-generated low-frequency coeflfficients; Finally, the extraction of visual feature vector, together with the watermark is generated watermark extracting the key to complete the watermark embedding. Experiments show： the Method in the JPEG compression, filtering, noise and the geometric deformation, such as the rotation, scaling, bending etc. have a good robustness.

关 键 词：多小波变换 离散余弦变换 分形编码 视觉特征向量 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构;自动化与计算机技术—计算机科学与技术]