摘要
结合奇异值分解和小波包分解的特点,提出了一种基于四重奇异值分解的小波包数字图像水印算法.该算法先对载体图像进行分块,然后对每块二级小波包分解后的频带四重使用奇异值分解和再次分块的方法构造矩阵,将SVD后提取的奇异值重新分配和组合,最后将灰度水印图像有效地嵌入到多次组合后的矩阵中.这不仅能增加嵌入的信息量,而且极大地提高了水印的安全性,实现了水印的透明性和鲁棒性之间的最佳平衡.
In this paper, a new digital image watermarking algorithm in wavelet packets based on quartic SVD is proposed. First, the image is divided into multi-block. Then the new matrix is constructed by quartic SVD on the sub-band after two wavelet packets for each block and again block, which will re-allocation and combination for the extraction＇ s sin- gular value after SVD, and finally the gray watermarking image is embedded into the matrix after multiple combinations. The algorithm increases embedded information capacity and enhances the watermark＇s security, and achieves the optimal balance of the imperceptibility and robustness.
出处
《微电子学与计算机》
CSCD
北大核心
2009年第6期146-149,共4页
Microelectronics & Computer
基金
国家自然科学基金项目(50175070)
关键词
数字水印
四重奇异值分解
小波包分解
透明性
鲁棒性
digital watermarking
quartic SVD
wavelet packets transform
transparence
robustness
