Efficient Discriminative K-SVD for Facial Expression Recognition
Weifeng Liu, Caifeng Song and Yanjiang Wang
Dictionary learning has attracted growing intention for its prominent performance in many computer vision applications including facial expression recognition (FER). Discriminative K-SVD (D-KSVD) is one of conventional dic-tionary learning methods, which can effectively unify dictionary learning and classifier. However, the computation is huge when applying D-KSVD directly on Gabor features which has a high dimension. To tackle this problem, in this paper, we employ random projection on Gabor features and then put the reduced features into D-KSVD schema to obtain sparse representation and dictionary. To evaluate the performance, we implement the proposed method for FER on JAFFE database. We also employ support vector machine (SVM) on the sparse codes for FER. Ex-perimental results demonstrate that the computation is reduced a lot with little per-formance lost.