Authoring of scalable multimedia documents

1. Authoring of scalable multimedia documents by Benoit Pellan Cyril Concolato Presenter: Balaji Sukumaran

2. Scalable MSTI model • It describes multimedia documents composed of several media elements and enables author-driven adaptation by introducing the concept of scalability. • It is based on state-of-the-art multimedia document models that clearly separate media elements and logical structures from the multimedia presentation.

3. A multimedia document in the MSTI model

4. Authoring Of Scalable Documents Steps Involved • Base Document Authoring • Complete Document Authoring • Adaptation Graph Generation • Enhancement Layers Authoring

5. Base Document Authoring The elements and attributes are classified into • Media Description • Styling Properties • Composition Properties

6. Complete Document Authoring • This step gives authoring guidelines to generate adaptable MSTI documents using scalable MSTI model. • Simple document adaptability describes the general authoring principle.

7. From a base document to a two-layer scalable multimedia document

8. Simple Document Adaptability The three essential authoring principles are • A scalable document should not assume any temporal or interactive properties to be visualized. • A scalable document should provide all possible means to access media elements. • A scalable document should take advantage of the cooperation between temporal and interactive properties.

9. Adaptation Graph Generation • Provides simple but essential adaptation functionalities. • Generation of this adaptation graph requires mapping the three main adaptation parameters onto scalability axes and to identify key adaptation states.

10. Scalable adaptation axes Example

11. Key Adaptation Point • Key adaptation points are used when some specific usage configurations are to be optimally addressed. • Creators indicate key points by using random access layers.

12. Identifying key Adaptation States

13. Digressing Adaptation Parameter Values • Digression adaptation parameter values are signalled by skippable layers. • They provide additional flexibility since they increase the number of possible paths in the adaptation graph.

14. A digression in a one way adaptation graph

15. Forking Adaptation Parameter values • A forking adaptation parameter can be related to a very specific usage configuration that requires a customized presentation which differs from complete presentation of scalable multimedia document. • It can also be defined to initiate a scalable alternative to the main adaptation axis.

16. A short fork in one way adaptation graph

17. A long fork in a one way adaptation graph

18. Authoring STI Enhancement Layers Finally, the author creativity is required to design spatial, temporal and interactive layers that will determine the document presentation in various environments.

19. Conclusion and Future works • Discussed about general authoring principles that are essential when producing scalable MSTI documents and the authoring guidelines. • Future work include WYSIWYG scalable authoring tool with challenges like representing visually the three dimensions of a scalable multimedia model, efficiency, scalability to template based authoring and scalable sub presentations.