Parametric and nonparametric context models: A unified approach to scene parsing

In this paper a new nonparametric scene parsing approach is proposed which has three steps: image retrieval, label transferring and label gathering. In our approach, to incorporate the contextual knowledge in scene parsing, we propose to integrate both parametric and nonparametric context models into a unified framework. We adopt a co-occurrence graph to be our parametric context model to learn the co-occurrence frequency of objects. To consider different preferences of the co-occurring of one object with the other objects, the concept of co-occurring priority is introduced in this paper for the first time. Next, by using the learned co-occurrence graph and the context knowledge of the set of retrieved images, we propose new ways to incorporate contextual information in all three steps of nonparametric scene parsing approach. To evaluate our proposed approach, it is applied on MSRC-21 and SiftFlow datasets. The results show that our approach outperforms its competitors.