An Approach to Image Dimension Reduction and Its Application to Face Images

As a technique of feature extraction, 2DPCA is effective and efficient. Different from traditional PCA, it directly computes projection of one image matrix onto vector, to obtain feature for the image. In fact, 2DPCA is optimal for dimension compression under this consideration. There are two approaches to implement 2DPCA. The two approaches transform images into different spaces, and emphasize horizontal feature and vertical feature of face images respectively. Because the features extracted by the two approaches may complement each other, two schemes are designed to perform feature fusion. Experiments based on the fused features achieve high classification right rates.