【摘要】 基于提升小波变换(LWT)、奇异值分解(SVD)和离散余弦变换(DCT),提出一种新的盲水印技术方案。首先,将原始图像进行LWT变换,提取LL子带;然后,将子带划分成互不相交的模块进行SVD分解;最后,将正交向量u_i进行一维DCT变换得到■,再把二进制水印的每一位嵌入到■的中频系数中。仿真实验表明:该算法运算速度快,重构图像精确,具有鲁棒性和透明性。更多还原

【Abstract】 A new blind watermarking method is proposed in the paper. The method is based on the theory of LWT, SVD and DCT. Firstly, LWT is performed on the original image and the LL sub-band is obtained. Secondly, SVD is done for the non-overlap blocks of the LL sub-band. Finally, DCT transform is performed to get ■ for the orthogonal array u_i and per bit of the binary watermark is embedded in the middle frequency coefficients of ■. The results show that the method owns high speed and works perfectly on watermark. It is robust and imperceptible.更多还原