Correlation graphs 3 Cross-modal 3 Cross-modal hash learning 3 Deep learning Deep model 3 Dependency relationship 3 Hamming distance 3 Hash functions 3 Hashing method 3 Hashing retrieval 3 Higher dimensional features 3 Image regions 3 Intermodality 3 Modal analysis 3 Semantics 3 cross-modal hash learning 3 deep model 3 hashing retrieval 3