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Searching information in a collection of video-lectures

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Searching information in a collection of video-lectures Marco Ronchetti Giuseppe Riccardi Angela Fogarolli Dipartim. Informatica e Telecomunicazioni Universit à di Trento Italy
What do we need e-learning for? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What do we need e-learning for? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Traditional and remote students: how? ,[object Object],[object Object],[object Object],[object Object]
Traditional and remote students: how? ,[object Object],[object Object],[object Object],[object Object]
Breaking the space-temporal unit ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Logical Architecture Synchronous ( webcast ) Asynchronous ( On line , or download - podcast ) Asynchronous( CD - DVD )
Our requirements ,[object Object],[object Object],[object Object]
Our requirements ,[object Object],[object Object],[object Object],[object Object],[object Object]
System Architecture OnStage Web Server Video Streamer DVD Browser LODE acquisition
End user requirements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cognitive interface ,[object Object],[object Object],[object Object],[object Object],[object Object]
LODE: the user interface
New Flash version
Lode - portability Supporto della didattica tradizionale Mac – Win - Linux Player MP4 (no slides yet) Presently attempting a port to mobile phones
Acquisition - User interface
Acquisition setup
Our experience ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Student feedback ,[object Object],[object Object],75% anticipated using the system often or very often 5% 63% total 2 nd exam (23 stud.) 1 st exam (45 stud.) students who… 4% 6% … followed the course completely off-line 87% 51% … used the system to review at least one lecture
Advantages from student’s perspective ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Other advantages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Can we do more? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Needle - search results
Needle - architecture ASR Multimodal search!
Needle - ASR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Needle - Vocabulary Research system vocabulary contained 62,879 words Manual transcription contained 702 terms - 57 not present in vocabulary 36 were technical terms Rest was english or spanish words, company names, other minor stuff (re-…, diminutives). Language model is important! We took Java books (11,443 terms before stemming - added to the vocabulary and decreased the unrecognized words from 8% to 3%)
ASR - is it good? For information retrieval - yes. Rare false positive on interesting domain!
Conclusion ,[object Object],[object Object],[object Object]
Conclusion: the future ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Searching information in a collection of video-lectures

  • 1. Searching information in a collection of video-lectures Marco Ronchetti Giuseppe Riccardi Angela Fogarolli Dipartim. Informatica e Telecomunicazioni Universit à di Trento Italy
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  • 7. Logical Architecture Synchronous ( webcast ) Asynchronous ( On line , or download - podcast ) Asynchronous( CD - DVD )
  • 8.
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  • 10. System Architecture OnStage Web Server Video Streamer DVD Browser LODE acquisition
  • 11.
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  • 13. LODE: the user interface
  • 15. Lode - portability Supporto della didattica tradizionale Mac – Win - Linux Player MP4 (no slides yet) Presently attempting a port to mobile phones
  • 16. Acquisition - User interface
  • 18.
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  • 23. Needle - search results
  • 24. Needle - architecture ASR Multimodal search!
  • 25.
  • 26. Needle - Vocabulary Research system vocabulary contained 62,879 words Manual transcription contained 702 terms - 57 not present in vocabulary 36 were technical terms Rest was english or spanish words, company names, other minor stuff (re-…, diminutives). Language model is important! We took Java books (11,443 terms before stemming - added to the vocabulary and decreased the unrecognized words from 8% to 3%)
  • 27. ASR - is it good? For information retrieval - yes. Rare false positive on interesting domain!
  • 28.
  • 29.