1. Hyperlinks over Continuous Media E. Vervaet, E. Duval, H. Olivié Department of Computer Science, Katholieke Universiteit Leuven, Leuven, Belgium

2. Overview Introduction Dynamic Link Maps Example Scheduling Related Research Conclusion

3. Introduction hypermedia ~ multimedia + hypertext Traditionally  Media of static nature ( text, still images, …) Our goal  Introduction of continuous media into hypermedia environments (video, audio, …) Hyperlinks over dynamic content

4. Dynamic Link Maps (1) Prototype system for hyperlinks over dynamic media Implemented in Java Dynamic Link Map (DLM) = dynamically evolving list of hyperlinks, defined over a source document Context of an anchor

5. Dynamic Link Maps (2) Link map files (stocks.map) The scheduling file US Stock Markets,http://ccn.../us_markets.html,stop ComStock homepage,http://www.../index.html,continue @C:/apps/amovie,news.mpg $C:/Pr.../netscape.exe,NETSCAPE INTERACTIVE Stocks in ner...,1000,45000,file://maps/stocks.map Aussie Open...,45500,79000,file://maps/tennis.map

6. Example (1)

7. Example (2)

8. Scheduling Three algorithms supported: –relative scheduling –absolute scheduling –interactive scheduling  Inter Process Communication (IPC) needed best: flexible and robust solution: Java DDE implementation

9. Related Research (1) The Amsterdam Hypermedia Model  Conceptual aspects: context of an anchor, channels,... The Leuven Hypermedia Model  Topology of a set ~ Dynamic Link Map

10. Related Research (2) WWW applications: real-time video and audio on the Internet Vosaic, VivoActive, Realvideo, … –Compression algorithms –Network protocols –Server software

11. Conclusion Our prototype proves it is possible to build a system for hyperlinks over continuous media which is open (flexible) portable both practical and has conceptual richness Prototype needs to be extended