基于小波域的彩色图像自适应水印算法  

A Color-Image-Adaptive Digital Watermarking Algorithm Based on the Wavelet Domain

作　　者：许晔[1] 李象霖[1] 王颖[1] 

机构地区：[1]中国科学技术大学研究生院信息安全国家重点实验室,北京100039

出　　处：《通信技术》2003年第5期91-94,共4页Communications Technology

基　　金：国家高技术计划资助项目(编号:2001AA144160)

摘　　要：提出了一种小波域下,基于小波零树结构的彩色图像水印嵌入算法。该算法通过选取对彩色图像视觉效果影响较小的色彩空间进行水印的嵌入,使嵌入水印的图像透明性较好;通过对原始图像和水印图像分别进行不同级别的小波变换,自适应地选取原始图像小波重要系数,将水印图像小波系数以一定的方式嵌入进去,使图像具有很好的稳健性及抗压缩性;水印的恢复只借助少量密钥信息。实验结果表明该算法是有效和可行的。In this paper , a digital color-image watermarking algorithm which is based on the zerotree wavelet coding is presented .We can select and modify the hue-space which has a little influence to human-visual-system to get a better transparency ; We also select and modify the significant coefficients adaptively , and then embed the watermark sequence in them according to giving the different level transforms to the original color-image and the watermarking image. So this algorithm has a better quality of robustness and a better qulity of resisting the damage from JPEG compression . Few original properties of the coefficants are used to abstract the watermarking . Our simulation experiments have shown that this algorithm can obtain very good results.

关 键 词：数字水印 小波零树 彩色图像自适应 

分 类 号：TN91[电子电信—通信与信息系统]