LIP6 2000/030:
THÈSE de DOCTORAT de l'UNIVERSITÉ PARIS 6 LIP6 /
LIP6
research reports
187 pages - Septembre/September 2000 -
French document.
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Thème/Team: Objets et Agents pour Systèmes d'Information et de Simulation
Titre français : Classification de séquences audiovisuelles
Titre anglais : Classification of audiovisual sequences
Abstract : In the context of automatic indexing of audio-visual documents, we are interested in collections of programs that respect a common general structure, such as broadcast news or some news or variety programs. We aim at representing and recognizing in scuch programs some characteristic sequences which can be annotated as a whole by a documentalist, such as a song in a variety program or a report in a broadcast news. We propose a language that represent such classes of sequences as templates. The definition of a template relies on the one hand on a vocabulary of directly observable primitive events, such as logos or jingles, and on the other hand on a set of temporal relations between these events. We propose to represent primitive events in a description logic formalism and we extend Allen's temporal interval algebra with an iteration operator « * » denoting a sequence of temporally adjacent events, and with specific constraints involving a negation. We present the template recognition problem as a constraint satisfaction problem and propose an efficient solving procedure, as well as an implementation of this procedure in an existing constraint satisfaction framework. We finally expose a set of experiments conducted at the French National Institute of Audiovisual (INA) on a corpus of broadcast news.
Key-words : audiovisual indexing, program collection, template, sequence, description logics, temporal reasoning, constraint satisfaction
Publications internes LIP6 2000 / LIP6 research reports 2000