中文说明：基于二维PCA对人脸进行识别，对图像有很好的降维作用，且识别率比pca好
English Description：
Face recognition based on two-dimensional PCA has a good effect on image dimensionality reduction, and the recognition rate is better than PCA
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中文说明：基于二维PCA对人脸进行识别，对图像有很好的降维作用，且识别率比pca好
English Description：
Face recognition based on two-dimensional PCA has a good effect on image dimensionality reduction, and the recognition rate is better than PCAu2dpca.m
u2dpca_test.m