对于磁共振图像，使用高斯滤波器对图像进行滤波，对滤波后的图像进行边缘和图像区域的选取，计算两者的均值和标准差，最后得到新的信噪比值。-For magnetic resonance images, we can use a Gaussian filter to the image for filtering. After the selection of the area of the air and the area of the image,then calculate the mean