置乱变换核心程序，是整个多重数字水印嵌入技术的重点，主要利用的是置乱变换的周期性，不同大小的图像有不同的周期，可以作为传输的密钥-Scrambling transform core processes, it is the multiple digital watermark embedding technology, mainly focused on the use of scrambling transformation is the cyclical nature of the images of different sizes have different cycles, can be used as the key transmission