Kernel-Based Multiview Joint Sparse Coding for Image Annotation

摘要

It remains a challenging task for automatic image annotation problem due to the semantic gap between visual features and semantic concepts. To reduce the gap, this paper puts forward a kernel-basedmultiview joint sparse coding (KMVJSC) framework for image annotation. In KMVJSC, different visual features as well as label information are considered as distinct views and are mapped to an implicit kernel space, in which the original nonlinear separable data become linearly separable. Then, all the views are integrated into amultiviewjoint sparse coding framework aiming to find a set of optimal sparse representations and discriminative dictionaries adaptively, which can effectively employ the complementary information of different views. An optimization algorithm is presented by extending K-singular value decomposition (KSVD) and accelerated proximal gradient (APG) algorithms to the kernelmultiview framework. In addition, a label propagation scheme using the sparse reconstruction and weighted greedy label transfer algorithmis also proposed. Comparative experiments on three datasets have demonstrated the competitiveness of proposed approach compared with other related methods.