Semantic Concept Network and Deep Walk-based Visual Question Answering
Qun Li, Fu Xiao, Le An, Xianzhong Long, Xiaochuan Sun · ACM Transactions on Multimedia Computing Communications and Applications · 2019
Visual Question Answering (VQA) is a hot-spot in the intersection of computer vision and natural language processing research and its progress has enabled many in high-level applications. This work aims to describe a novel VQA model based on semantic concept network construction and deep walk. Extracting visual image semantic representation is a significant and effective method for spanning the semantic gap. Moreover, current research has shown that co-occurrence patterns of concepts can enhance semantic representation. This work is motivated by the challenge that semantic concepts have complex interrelations and the relationships are similar to a network. Therefore, we construct a semantic concept network adopted by leveraging Word Activation Forces (WAFs), and mine the co-occurrence patterns of semantic concepts using deep walk. Then the model performs polynomial logistic regression on the basis of the extracted deep walk vector along with the visual image feature and question feature. The proposed model effectively integrates visual and semantic features of the image and natural language question. The experimental results show that our algorithm outperforms competitive baselines on three benchmark image QA datasets. Furthermore, through experiments in image annotation refinement and semantic analysis on pre-labeled LabelMe dataset, we test and verify the effectiveness of our constructed concept network for mining concept co-occurrence patterns, sensible concept clusters, and hierarchies.