Semi-Supervised Multi-View Discrete Hashing for Fast Image Search

Hashing is an important method for fast neighbor search on large scale dataset in Hamming space. While most research on hash models are focusing on single-view data, recently the multi-view approaches with a majority of unsupervised multi-view hash models have been considered. Despite of existence of millions of unlabeled data samples, it is believed that labeling a handful of data will remarkably improve the searching performance. In this paper, we propose a semi-supervised multi-view hash model. Besides incorporating a portion of label information into the model, the proposed multi-view model differs from existing multi-view hash models in three-fold: 1) a composite discrete hash learning modeling that is able to minimize the loss jointly on multi-view features when using relaxation on learning hashing codes; 2) exploring statistically uncorrelated multi-view features for generating hash codes; and 3) a composite locality preserving modeling for locally compact coding. Extensive experiments have been conducted to show the effectiveness of the proposed semi-supervised multi-view hash model as compared with related multi-view hash models and semi-supervised hash models.