The method separates a binary image by means of the quadtree method while the image size can be dynamically changed. 这种方法采用二值图像的四叉树表示方法实现图像分割，图像块的尺寸可以动态调整。
Firstly, we design a binary image watermarking signal and encrypted it by a chaotic sequence cipher before it is embedded. 将含有版权信息的二值图像作为水印，利用混沌密码对其进行加密，水印方案具有双重的安全性。
