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This paper describes cluster-temporal browsing of news video database. Cluster-temporal browsing combines content similarities and temporal adjacency into single representation. Visual, conceptual and lexical features are used to organize and view similar shot content. Interactive experiments with eight test users have been carried out using a database of roughly 60 hours of news video. Results indicate improvemenfs in browsing efficiency when automatic speech recognition transcripts are incorporated into browsing by visual similarity. Cluster-temporal browsing application received positive comments from the test users and performed well in overall comparison of interactive video retrieval systems in TRECVID 2003 evaluation.

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This paper describes revised content-based search experiments in the context of TRECVID 2003 benchmark. Experiments focus on measuring content-based video retrieval performance with following search cues: visual features, semantic concepts and text. The fusion of features uses weights and similarity ranks. Visual similarity is computed using Temporal Gradient Correlogram and Temporal Color Correlogram features that are extracted from the dynamic content of a video shot. Automatic speech recognition transcripts and concept detectors enable higher-level semantic searching. 60 hours of news videos from TRECVID 2003 search task were used in the experiments. System performance was evaluated with 25 pre-defined search topics using average precision. In visual search, multiple examples improved the results over single example search. Weighted fusion of text, concept and visual features improved the performance over text search baseline. Expanded query term list of text queries gave also notable increase in performance over the baseline text search.