一种改进的数字图像置乱算法

图像置乱技术以有效地保护数字图像的内容为目的，结合常见的几种置乱方法，提出了一种新的图像置乱算法-GEMMER算法。该算法首先将水印图像进行小波分层，得到一个环形向量，然后经过旋转置乱后，嵌入到宿主图像中。经实验分析证明，该方法有良好的周期性，经旋转置乱后的图像能量分布均匀，使水印信息的保密性有了很大提高。

An Extended Method for Digital Image Scrambling

With the several common image scrambling algorithms, an extended image scrambling al- gorithm - GEMMER algorithm is proposed to protect context of image effectively：first watermarking im- age is transformed into information wavelets to form a ring vector;then ring vector is embedded into the host image after rotating and scrambling. The experimental results have proved that the method has good periodicity. And the energy distribution of the image is uniform. Therefore, there are great improvements in the watermarking information security.