Broadcast news gisting using lexical cohesion analysis
Stokes, Nicola and Newman, Eamonn and Carthy, Joe and Smeaton, Alan F. (2004) Broadcast news gisting using lexical cohesion analysis. In: ECIR 2004 - 26th European Conference on Information Retrieval, 5-7 April 2004, Sunderland, UK. ISBN 978-3-540-21382-6
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In this paper we describe an extractive method of creating very short summaries or gists that capture the essence of a news story using a linguistic technique called lexical chaining. The recent interest in robust gisting and title generation techniques originates from a need to improve the indexing and browsing capabilities of interactive digital multimedia systems. More specifically these systems deal with streams of continuous data, like a news programme, that require further annotation before they can be presented to the user in a meaningful way. We automatically evaluate the performance of our lexical chaining-based gister with respect to four baseline extractive gisting methods on a collection of closed caption material taken from a series of news broadcasts. We also report results of a human-based evaluation of summary quality. Our results show that our novel lexical chaining approach to this problem outperforms standard extractive gisting methods.
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