一种基于小波树结构的彩色水印嵌入算法

A Digital Watermarking Algorithm Based on Wavelet Transform Tree Structure

提出了一种基于小波树的彩色水印嵌入算法.该算法对图像的R,G,B分量分别进行小波变换,通过小波树的各层系数和它们之间的关系,对各低频子带进行分类,并根据人眼的视觉特性,对不同的区域采用不同的嵌入强度,使嵌入的不可见性和鲁棒性得到很好的效果,在提取时不需要原始图像,是一种盲水印算法.实验表明,该算法简单高效,可嵌入信息容量大,不可见性好.对一般的图像处理和攻击如:JPEG压缩,加噪声,剪切,滤波等具有很好的鲁棒性.

The paper presents a digital watermarking algorithm based on wavelet transform tree structure. The algorithm splits the image＇s s R,G,B and used their＇ s tree structure of the coefficients of wavelet transform of the image. Accrossing to different groups of the lowest frequency wavelet coefficients classified by human visual system, the watermark is embedded in different domain with different intensity. The embedded watermark has good transparency and robustness. No host image is needed in watermarking extraction,which is a blind watermarking algorithm experiment results show that the algorithm is effective and with high capacity of watermark and good transparency. And it is robust a- gainst normal image processing and attacks such as JPEG compression,adding noise,filtering and cutting.