基于二代小波和图像置乱的数字图像盲水印算法

针对基于第一代小波的多分辨率水印算法运算速度慢、图像的重构质量与变换时延拓边界的方式有关等不足，根据第二代小波变换的特点，结合Amold置乱算法，给出一种基于小波多级提升和水印图像置乱来实现的改进型多分辨率图像水印算法，并分别采用Haar、Db2、Db4、9/7小波进行仿真实验。结果表明，该算法不仅保持了传统小波多分辨率图像水印算法的优点，而且有效提高了处理速度，并弥补了传统小波多分辨率图像水印算法中当滤波器增长时，含水印图像质量下降的不足。

Blind digital image watermark algorithm based on the second-generation wavelet and image-scrambling

In view of the first-generation wavelet's deficiencies such as low operation speed and that the quality of reconstructed image has something to do with the way of extending the boundary, according to the characteristic of the second-generation wavelet transformation, using the traditional wavelet multi-resolution image watermark algorithm and combining the Amold scrambling algorithm, we proposed a multi-resolution image watermark algorithm which was based on wavelet multistage-promotion and watermark image scrambling. Haar, Db2, Db4 and 9/7 were used to do experiments. The simulation results show that this algorithm can not only make up for the quality deficiency resulted from watermark in the traditional wavelet multi-resolution image watermark algorithm when the filter becomes larger, but also greatly improve the processing speed.