方式3.1：Another novel method, the PCA+Null Space method, was proposed by Huang et al. in [15] for dealing with the small sample size problem.
方式2的特點/優點：Thus, by applying this method翻譯社 we find the projection directions that on one hand maximize the Euclidean distance between the face images of different classes and on the other minimize the distance between the face images of the same class. This ratio is maximized when the column vectors of the projection matrix W are the eigenvectors of ....
