Beyond Bags of Features: Spatial Pyramid Matching for Recognizing Natural Scene Categories
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In the scene classification, a scene can be considered as a set of object cliques. Objects inside each clique have semantic correlations with each other, while two objects from different cliques are relatively independent. To utilize these correlations for better recognition performance, we propose a new method - Object Coding on the Semantic Graph to address the scene classification problem. We first exploit prior knowledge by making statistics on a large number of labeled images and calculating the dependency degree between objects. Then, a graph is built to model the semantic correlations between objects. This semantic graph captures semantics by treating the objects as vertices and the objects affinities as the weights of edges. By encoding this semantic knowledge into the semantic graph, object coding is conducted to automatically select a set of object cliques that have strongly semantic correlations to represent a specific scene. The experimental results show that the Object Coding on semantic graph can improve the classification accuracy.