Gaze movement-driven random forests for query clustering in automatic video annotation

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• 作者：Stefanos Vrochidis ; Ioannis Patras…
• 关键词：Implicit feedback ; Eye ; tracking ; Interactive video retrieval ; Clustering ; Random forests
• 刊名：Multimedia Tools and Applications
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：76
• 期：2
• 页码：2861-2889
• 全文大小：
• 刊物类别：Computer Science
• 刊物主题：Multimedia Information Systems; Computer Communication Networks; Data Structures, Cryptology and Information Theory; Special Purpose and Application-Based Systems;
• 出版者：Springer US
• ISSN：1573-7721
• 卷排序：76

文摘

In the recent years, the rapid increase of the volume of multimedia content has led to the development of several automatic annotation approaches. In parallel, the high availability of large amounts of user interaction data, revealed the need for developing automatic annotation techniques that exploit the implicit user feedback during interactive multimedia retrieval tasks. In this context, this paper proposes a method for automatic video annotation by exploiting implicit user feedback during interactive video retrieval, as this is expressed with gaze movements, mouse clicks and queries submitted to a content-based video search engine. We exploit this interaction data to represent video shots with feature vectors based on aggregated gaze movements. This information is used to train a classifier that can identify shots of interest for new users. Subsequently, we propose a framework that during testing: a) identifies topics (expressed by query clusters), for which new users are searching for, based on a novel clustering algorithm and b) associates multimedia data (i.e., video shots) to the identified topics using supervised classification. The novel clustering algorithm is based on random forests and is driven by two factors: first, by the distance measures between different sets of queries and second by the homogeneity of the shots viewed during each query cluster defined by the clustering procedure; this homogeneity is inferred from the performance of the gaze-based classifier on these shots. The evaluation shows that the use of aggregated gaze data can be exploited for video annotation purposes.