结合PCA的尺度不变特征变换(SIFT)算法，最大似然（ML）准则和最大后验概率（MAP）准则，这是第二能量熵的matlab代码。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Maximum Likelihood (ML) criteria and maximum a posteriori (MAP) criterion, This is the second energy entropy matlab code.