Abstract:With the rapid development of the Internet and multimedia technology, data on the Internet is expanded from only text to image, video, text, audio, 3D model, and other media types, which makes cross-media retrieval become a new trend of information retrieval. However, the "heterogeneity gap" leads to inconsistent representations of different media types, and it is hard to measure the similarity between the data of any two kinds of media, which makes it quite challenging to realize cross-media retrieval across multiple media types. With the recent advances of deep learning, it is hopeful to break the boundaries between different media types with the strong learning ability of deep neural network. But most existing deep learning based methods mainly focus on the pairwise correlation between two media types as image and text, and it is difficult to extend them to multi-media scenario. To address the above problem, Deep Fine-grained Correlation Learning (DFCL) approach is proposed, which can support cross-media retrieval with up to five media types (image, video, text, audio, and 3D model). First, cross-media recurrent neural network is proposed to jointly model the fine-grained information of up to five media types, which can fully exploit the internal details and context information of different media types. Second, cross-media joint correlation loss is proposed, which combines distribution alignment and semantic alignment to exploit both intra-media and inter-media fine-grained correlation, while it can further enhance the semantic discrimination capability by semantic category information, aiming to promote the accuracy of cross-media retrieval effectively. Extensive experiments on 2 cross-media datasets are conducted, namely PKU XMedia and PKU XMediaNet datasets, which contain up to five media types. The experimental results verify the effectiveness of the proposed approach.