A study of semantic context detection by using SVM and GMM approaches

Semantic-level content analysis is a crucial issue to achieve efficient content retrieval and management. In this paper, we propose a hierarchical approach that models the statistical characteristics of several audio events over a time series to accomplish semantic context detection. Two stages, including audio event and semantic context modeling/testing, are devised to bridge the semantic gap between physical audio features and semantic concepts. HMMs are used to model audio events, and SVMs and GMMs are used to fuse the characteristics of various audio events related to some specific semantic concepts. The experimental results show that the approach is effective in detecting semantic context. The comparison between SVM- and GMM-based approaches is also studied.