ML法能够很好的估计信号的信噪比,利用matlab针对图像进行马氏距离计算 ,包括单边带、双边带、载波抑制及四倍频。- ML estimation method can be a good signal to noise ratio, Using matlab to calculate the Mahalanobis distance for the image, Including single sideband, double sideband, suppressed carrier and