Asymmetric cross-view dictionary learning for person re-identification

Person re-identification is a critical yet challenging task in video surveillance which intends to match people over non-overlapping cameras. Most metric learning algorithms for person re-identification use symmetric matrix to project feature vectors into the same subspace to compute the similarity while ignoring the discrepancy between views. To solve this problem, we proposed an asymmetric cross-view matching algorithm with dictionary learning to alleviate the variations in human appearance across different views. Not only the views' dictionaries but also the persons' dictionary codes are constrained. Moreover, the 'between-class' and the 'within-class' distance are taken into consideration which makes the forming dictionary codes more robust and discriminative than the original feature vectors. The effectiveness of our approach is validated on the VIPeR and CUHK01 datasets. Experimental results show the proposed algorithm achieves compelling performance and asymmetric model plays an important role in the proposed approach.