这是一个全局阈值分割的m函数，它能对图像高频部分分割，效果较好-This is a global threshold segmentation of the m function, it high-frequency part of the image segmentation, better

很好的代码，供大家使用和参考，大家赶紧下吧，试验过了，没有错误-Very good code, for your use and reference, we hastened to the next bar, tested, and no error

计算PSNR。可直接调用，两个输入参数im1,im2为两个图象序列，返回值为PSNR的值。-Calculation of PSNR. Can be called directly, two input parameters im1, im2 two image sequences, the return value is the PSNR.