简单的图形处理程序，供大家分享。程序运行后，首先从图中截取一块区域，然后程序会对这个区域计算像素均值和欧几里得差值，并得到结果。 -Simple graphical procedure for everyone to share. Program runs, the first interception of a regional map, and then the procedure will be calculated in the region and the pixel averag