中文说明： 有较好的参考价值，有PMUSIC 校正前和校正后的比较，人脸识别中的光照处理方法，应用小区域方差对比，程序简单，结合PCA的尺度不变特征变换(SIFT)算法，比较了软阈值，硬阈值及当今各种阈值计算方法。
English Description：
It has a good reference value, including the comparison of pmusic before and after correction, the illumination processing method in face recognition, the application of small area variance comparison, the program is simple, combined with PCA scale invariant feature transform (SIFT) algorithm, the soft threshold, hard threshold and various threshold calculation methods are compared.