Towards Second and Third Generation Web-based Multimedia - PowerPoint PPT Presentation

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Towards Second and Third Generation Web-based Multimedia

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Jacco van Ossenbruggen, Joost Geurts, Frank Cornelissen, Lynda Hardman and Lloyd ... Cuypers system realises second generation. on-the-fly multimedia generation ... – PowerPoint PPT presentation

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Title: Towards Second and Third Generation Web-based Multimedia


1
Towards Second and Third Generation Web-based
Multimedia
  • Jacco van Ossenbruggen, Joost Geurts, Frank
    Cornelissen, Lynda Hardman and Lloyd Rutledge
  • CWI Amsterdam
  • email Jacco.van.Ossenbruggen_at_cwi.nl

2
Talk overview
  • Three generations Web content
  • what does the title mean
  • Requirements for 2nd 3rd generation multimedia
  • why multimedia is different from text
  • Overview of CWIs Cuypers engine
  • realising 2nd generation multimedia
  • Future directions
  • towards 3rd generation multimedia

3
The Web in three generations
  • 1. Hand-coded (HTML) Web content
  • easy access through uniform interface
  • huge authoring and maintenance effort
  • hard to deal with dynamically changing content
  • 2. Automated on-the fly content generation
  • based on templates filled with database content
  • later extended with XML document transformations
  • 3. Automated processing of content
  • The Semantic Web
  • explicit meta-data instead of screen scraping
  • agreed upon semantics (RDFS, DAMLOIL)

4
Multimedia on the Web
  • Real multimedia Web content is still rare
  • Mostly bells whistles to enhance HTML text
  • or mono-media AV-streams
  • Virtually all presentations are hand-authored
  • proprietary formats that are hard to generate
  • limited support for dynamic content and
    multichanneling
  • most Web technology is text/page-oriented
  • with SMIL as one of the few exceptions
  • Conclusion
  • Multimedia has hardly caught
  • up with the 1st generation Web!

5
Need for 2nd generation multimedia
  • Adapt to end-users platform capabilities
  • multichanneling PC, PDA, mobile, voice-only, ...
  • Adapt to the network resources available
  • bandwidth and other quality of service parameters
  • Personalization
  • language, abilities, level of expertise, ...

6
But multimedia is different from text...
  • Different document and presentation abstractions
  • hard to separate style from structure
  • Formatting is not based on text flow
  • no pages or scrollbars, no line-breaking or
    hyphenation
  • templates often do not work well either
  • Feedback from the formatting back-end required
  • need to check whether proposed layout is feasible
  • layout of media items is less flexible than
    text-based layout
  • Transformations are hard in a functional language
  • need to try out designs and backtrack when
    necessary

7
Example scenario
  • User is interested in Rembrandt and wants to know
    about the chiaroscuro technique
  • System responds with textual explanation of the
    technique and a number of example images of its
    application in Rem-brandts paintings

8
Cuypers multimedia generation engine
9
Cuypers multimedia generation engine
  • Cuypers is based on
  • media independent presentation abstractions
  • transformation rules with built-in backtracking
    andconstraint solving

10
Cuypers Web Embedding
  • Prolog-based engine embedded in Apache
  • XML-based input/output stream
  • Java servlets for XML to Prolog translation

11
Cuypers Web Embedding
  • Prolog-based engine embedded in Apache
  • XML-based input/output stream
  • Java servlets for XML to Prolog translation
  • but all knowledge is
  • implicit and hidden in the rules
  • lost in the generated Web presentation
  • not reusable for other Web sites

12
Potential Knowledge Sources
13
Conclusions
  • Multimedia is mostly first generation
  • hand-authored presentations
  • common Web-tools are too text-centric
  • Cuypers system realises second generation
  • on-the-fly multimedia generation
  • media-centric transformations
  • Third generation is around the corner
  • generating annotated multimedia
  • reusing knowledge available on the Semantic Web

14
Take home message
  • Multimedia really is different from text!
  • Thanks for your attention
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