Image Captioning With Visual-Semantic Double Attention

In this article, we propose a novel Visual-Semantic Double Attention (VSDA) model for image captioning. In our approach, VSDA consists of two parts: a modified visual attention model is used to extract sub-region image features, then a new SEmantic Attention (SEA) model is proposed to distill semantic features. Traditional attribute-based models always neglect the distinctive importance of each attribute word and fuse all of them into recurrent neural networks, resulting in abundant irrelevant semantic features. In contrast, at each timestep, our model selects the most relevant word that aligns with current context. In other words, the real power of VSDA lies in the ability of not only leveraging semantic features but also eliminating the influence of irrelevant attribute words to make the semantic guidance more precise. Furthermore, our approach solves the problem that visual attention models cannot boost generating non-visual words. Considering that visual and semantic features are complementary to each other, our model can leverage both of them to strengthen the generations of visual and non-visual words. Extensive experiments are conducted on famous datasets: MS COCO and Flickr30k. The results show that VSDA outperforms other methods and achieves promising performance.