Istituto di Scienza e Tecnologie dell'Informazione     
Gennaro C., Rabitti F., Savino P. The Use of XML in a Video Digital Library. vol. 2818 Henk M. Blanken, Torsten Grabs, Hans-Jörg Schek, Gerhard Weikum (eds.). (Lecture Notes in Computer Science, vol. 2818). Twente, Zürich, and Saarbrücken: Springer, 2003.
In this chapter we want to show how the role of XML is becoming a key choice in the management of Audio-Video information, which is becoming of paramount importance in applications such as metadata (e.g., MPEG-7) to the speci cation of mixed audio-video and data/program structures for digital TV decoders. interactive digital television. The role of XML spans at di erent levels, from the specication of To illustrate the new role of XML, we focus here on Video Digital Libraries, where di erent aspects of the management of audio-visual information are addressed, with particular emphasis on access by content. As speci c example of Video DL, we refer to the ECHO system (European CHronicoles On-line). The ECHO system assists the user during the indexing and retrieval of A/V documentaries. Multiple speech recognition modules, for di erent European languages are included. Likewise, video and image analysis techniques are used for extracting visual features and segmenting video sequences by automatically locating boundaries of shots, scenes, and conversations. Metadata are then manually associated with lm documentaries in order to complete their classi cation. Search and retrieval via desktop computer and wide area networks is performed by expressing queries on the audio transcript, on metadata or by image similarity retrieval. Retrieved documentaries or their abstract, are then presented to the user. By the collaborative interaction of image, speech and manually associated metadata, the system compensates for problems of interpretation and search in the error-full and ambiguous data sets. A fundamental aspect of the ECHO system is the metadata model (based on the IFLA/FRBR) used for representing the audio-visual contents of the archive. XML is used as an internal representation of video metadata, as well as an interchange format with other systems.
Subject XML
Video Digital Lybrary
Metadata model
Metadata Editor
H.3.3 Information Search and Retrieval. Retrieval models

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