To reduce the impacts on face recognition rate coursed by variations of pose,expression and illumination,a new face recognition approach based on sub-pattern two-directional 2DPCA is adopted.By dividing the original images into blocks,the approach can efficiently extract the local discriminant features of these images.At the same time,the two-directional 2DPCA((2D)2PCA)method is used to extract the features on these blocks straightly,which avoids the conversion between matrix and vector.Therefore,the method...