最大似然（ML）准则和最大后验概率（MAP）准则，借鉴了主成分分析算法（PCA），通过反复训练模板能有较高的识别率。- Maximum Likelihood (ML) criteria and maximum a posteriori (MAP) criterion, It draws on principal component analysis algorithm (PCA), Through repeated training gJuQvHGlate have higher recognition rate.