22 nd january 2004 uitv 2004 newsboy: an interactive news retrieval system joemon m jose the...
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22nd January 2004 UITV 2004
NewsBoy: an interactive news retrieval system
Joemon M Jose The Information Retrieval GroupDepartment of Computing ScienceUniversity of GlasgowEmail:- [email protected]://www.dcs.gla.ac.uk/~jj
Outline
BackgroundOnline News retrievalScenarioPersonalisation and Presentation
StrategiesSystem interfaceFuture Work
Background
news programmesMultiple channelsRegular update Information overload
User requirementMay not be interested in all newsNeed an overview Interested in selected topics Interested in latest news
Information Retrieval
Users information need (Query)Retrieval strategiesInteractive issues
Browsing, results presentationEmbedded in other applicationsPersonalisation
Adaptive, context sensitive retrievalOnline news retrieval
NewsFlash System
We present a world exclusive - Saddam Hussein in his own words….At the weekend, the veteran labour politican Tony Benn travelled to Baghdad to meet and interview the Iraqi President….You are conscious of the role that Iraqis have set out for themselves, inspired by their own culture, their civilization and their role in human history…. Having said that, the Iraqis are committed to their rights as much as they are committed to the rights of others
Video Indexing & Retrieval
Video programmes + Subtitles Hauppauge video capture card AVI file format, DivX codec
Video Shot segmentation Result of a single camera action Colour histogram based approach
Shot, subtitle alignment Using time stamp in subtitles
Key frame extraction thumbnails
Retrieval and summarisation
Shot + Corresponding teletext is considered as a document
Vector Space retrieval model Representation using term vectors Query is represented using query term vectors Cosine similarity match
Query based summary generation Summary of a document Tailored with respect to the query
NewsFlash System
We present a world exclusive - Saddam Hussein in his own words….At the weekend, the veteran labour politican Tony Benn travelled to Baghdad to meet and interview the Iraqi President….You are conscious of the role that Iraqis have set out for themselves, inspired by their own culture, their civilization and their role in human history…. Having said that, the Iraqis are committed to their rights as much as they are committed to the rights of others
Scenario
TV Broadcastsset-top box
Users Information overloadWants to see only interesting newsCouch potato culture
Remote control based interaction No keyboard,
Relaxed environment
Strategy/Issues
Simple interaction strategiesCouch potato environment
Intuitive browsingRemote Control
Up and down arrowsColour codingSelection buttons
Personalisation
User side…
Wants to know late breaking news Plane crash somewhere … Any major events
Users have interests Capturing their interests
Glasgow news, war on terrorism, football news etc. Needs to capture their profiles
User specific input From interaction
Needs to know about something
Document Clustering
We cluster shots into groups Single pass clusteringBased on the subtitles
As a result, we can present the daily news as groups of shotsEach group contains shots belongs to same
topicCrude story segmentation
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Learning Techniques
Identify patterns of usage If a person continuously accessing Glasgow
weather reportsThen he/she is interested in that topic
Prioritise/weight areas of interestPresent according to priority
Present late breaking newsRole of clustering
Profile Learning
Self-adaptive profile Adapt without explicit feedback Capture the profile with multiple factors
A profile P is comprised of a set of profiles p i
If a user views a document then that is used as an indication of interest
Similar to single pass clustering Strength of profiles
Presentation of personal news
News shots are grouped with respect to the profiles
Highest strength profiles are shown first
Evaluation Issues
Interaction strategies Retrieval effectiveness Quality of profiles User satisfaction Task based user-centred evaluation
Provide scenarios of usage Continuous usage over a week Logging and questionnaire based data capture
Future Work
Topic & Event detection Use of IR techniques
Story Segmentation Personalisation techniques
Adaptation within search sessions Long term adaptation Group Personalisation
Integration with Internet Evaluation Strategies