Publication Type

Journal Article

Version

publishedVersion

Publication Date

6-2008

Abstract

News videos from different channels, languages are broadcast everyday, which provide abundant information for users. To effectively search, retrieve, browse and track news stories, news story similarity plays a critical role in assessing the novelty and redundancy among news stories. In this paper, we explore different measures of novelty and redundancy detection for cross-lingual news stories. A news story is represented by multimodal features which include a sequence of keyframes in the visual track, and a set of words and named entities extracted from speech transcript in the audio track. Vector space models and language models on individual features (text, named entities and keyframes) are constructed to compare the similarity among stories. Furthermore, multiple modalities are further fused to improve the performance. Experiments on the TRECVID-2005 cross-lingual news video corpus showed that modalities and measures demonstrate variant performance for novelty and redundancy detection. Language models on text are appropriate for detecting completely redundant stories, while Cosine Distance on keyframes is suitable for detecting somewhat redundant stories. The performance on mono-lingual topics is better than multilingual topics. Textual features and visual features complement each other, and fusion of text, named entities and keyframes substantially improves the performance, which outperforms approaches with just individual features. (C) 2007 Elsevier Inc. All rights reserved.

Keywords

similarity measure, novelty, redundancy detection, multimodality, cross-lingual, near-duplicate keyframe, news videos

Discipline

Computer Sciences | Graphics and Human Computer Interfaces

Research Areas

Intelligent Systems and Optimization

Publication

Computer Vision and Image Understanding

Volume

110

Issue

3

First Page

418

Last Page

431

ISSN

1077-3142

Identifier

10.1016/j.cviu.2007.09.015

Publisher

Elsevier

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