为了简便编程工作，可以定义一个n*n的模板数组。另外，读者需要注意一点，在用窗口扫描图像过程中，对于图像的四个边-the sake of simplicity, can be defined a n * n template array. In addition, the needs of the readers attention to the fact that the window with the process of scanning images for the four image