GRAPH-BASED WEB VIDEO SEARCH RERANKING THROUGH CONSISTENCY ANALYSIS USING SPECTRAL CLUSTERING

This paper proposes a graph-based Web video search reranking method through consistency analysis using spectral clustering. Graph-based reranking is effective for refining text-based video search results. Generally, this approach constructs a graph where the vertices are videos and the edges reflect their pairwise similarities. A lot of reranking methods are built based on a scheme which regularizes the smoothness of pairwise ranking scores between adjacent nodes. However, since the overall consistency is measured by aggregating the individual consistency over each pair, errors in score estimation increase when noisy samples are included within their neighbors. To deal with the noisy samples, different from the conventional methods, the proposed method models the global consistency of the graph structure. Specifically, in order to detect this consistency, the propose method introduces a spectral clustering algorithm which can detect video groups, whose videos have strong semantic correlation, on the graph. Furthermore, a new regularization term, which smooths ranking scores within the same group, is introduced to the reranking framework. Since score regularization is performed by both local and global aspect simultaneously, the accurate score estimation becomes feasible. Experimental results obtained by applying the proposed method to a real-world video collection show its effectiveness.