ML法能够很好的估计信号的信噪比,本程序的性能已经超过其他算法，包括最后计算压缩图像的峰值信噪比和压缩效果的源码。- ML estimation method can be a good signal to noise ratio, This program has exceeded the performance of other algorithms, Including the final calculation of the compressed image peak signal to noise ratio and compression of the source.