ML法能够很好的估计信号的信噪比,Gabor小波变换与PCA的人脸识别代码，包含特征值与特征向量的提取、训练样本以及最后的识别。- ML estimation method can be a good signal to noise ratio, Gabor wavelet transform and PCA face recognition code, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition.