Enhancing Cross-Modal Hash Retrieval with Multiple Similarity Matrices

In order to further improve the performance of cross-modal retrieval,a cross-modal hash retrieval method integrating multi-level similarity information is proposed.First,self-attention method is used to enhance the text features,and a new fusion feature is constructed based on the original features and hash features of different modalities.Then,based on these three features,three auxiliary similarity matrices are constructed,and the fourth auxiliary similarity matrix is constructed by a weighted combination method.Finally,these four different matrices are used to calculate the loss functions between different similarity matrices and between different modalities.Since the four matrices include different feature forms and different matrix construction methods,they can better express similarity information of different modalities and improve the retrieval performance.The experiments are conducted on three benchmark datasets of Wikipedia,MIRFlickr and NUS-WIDE.The results show that the mAP values at different code bits of proposed method is better than that of many state-of-the-art methods,which verifies the effectiveness and robustness of our method.