Model of audiovisual description
The thematic, rhetorical, visual and sound aspects of an analysis of an audiovisual document are represented, in the annotation tool, in the form of description strata, as shown in Figure 4.10, and displayed on a timeline synchronized with a video player. A stratum is made up of several segments that temporally describe the subjects covered in a medium. The user can create/delete as many of these as desired. He can also adjust a segment’s time codes to position it correctly on the timeline. These two objects (stratum, segment) can also be created automatically by an annotation tool if the corresponding restrictions demand no user choice.
Figure 4.10. Example of a generated visual segment map and the associated metadata
Reference works and description models
Modularity of the ontologies
A semantic graph must be created under the control of an ontology describing a given domain’s annotation objects and their interactions. Our annotation system is capable of managing several domain ontologies simultaneously; each of these completes and/or specializes the system’s core ontology according to the specificities of the domain it describes. As such, a medium can be analyzed differently according to different domain ontologies.
From an archaeological standpoint, for example, the analysis of a medium must highlight the material remnants discovered and the scenarios envisioned around this discovery. From an academic research standpoint, however, the analysis of this same medium must emphasize the tools used and the methods adopted to successfully complete the archaeological excavation. In the scope of the Campus AAR project, several domain ontologies were tested in this system, among them:
- - the description ontology from the INA archives;
- - the description ontology from the Archives de l ’histoire des mathematiques (AHM);
- - the description ontology from the Archives rencontre des cultures (ARC);
- - the description ontology from the Patrimoine audiovisuel de la recherche en SHS (AGORA).
-  To access the AHM portal through the HAL - CAMPUS AAR site, log in to https://hal-campusaar.archives-ouvertes.fr/
-  To access the ARC portal through the HAL - CAMPUS AAR site, log in to https://hal-campusaar.archives-ouvertes.fr/
-  To access the AGORA portal through the HAL - CAMPUS AAR site, log in to https://hal-campusaar.archives-ouvertes.fr/ http://www.agora.msh-paris.fr/agorafr.aspx