Semi-supervised cross-modal learning for cross modal retrieval and image annotation

Multimedia data are usually associated with multiple modalities represented by heterogeneous features. Recently, many information retrieval tasks are not only restricted to the case of a single modal and the contend-based cross modal retrieval has become one of the popular research fields. The premise of cross modal retrieval is discovering the relationships between different modalities efficiently. Though some approaches have been proposed to address this challenging problem, they either ignores the precious labels, or heavily depends on the completely labeled training data. In addition, for features with relatively high dimensionality, it is of great importance to select the most informative ones. In this paper, we propose a semi-supervised algorithm for cross modal learning. Our algorithm can make full use of both a small number of labeled and an abundant unlabeled data to establish connections between modalities via a shared semantic space discovering. On the other hand, our algorithm automatically filter out the noisy and redundant features to further improve our model. Finally, we give an efficient solution to the objective function. The experiments on two publicly available datasets demonstrate that the proposed method is competitive with or even superior to the state-of-art counterparts.