Institut für Informatik
Rheinische Friedrich-Wilhelms-Universität Bonn
Kolloquium Sommersemester 2010
Die Dozenten der Informatik
Jun.-Prof. Dr. Björn Ommer, Universität Heidelberg
Seeing the Objects Behind the Parts: Compositional Scene Understanding
|Datum: ||Montag, June 21, 2010
|Zeit: ||17:15 Uhr
|Ort: ||Hörsaal 1, Römerstraße 164
AbstractThe compositional nature of visual objects significantly limits their representation complexity and renders learning of structured object models tractable. Adopting this modeling strategy we both (i) automatically decompose objects into a hierarchy of relevant compositions and we (ii) learn such a compositional representation for each category without supervision. Compositions are represented as probability distributions over their constituent parts and the relations between them. The global shape of objects is captured by a graphical model which combines all compositions. Inference based on the underlying statistical model is then employed to obtain a category level object recognition system. The generative nature of the presented model provides direct insights into the learned compositional structure of objects.
The approach has been successfully extended to near real-time analysis of videos where category-level object recognition, segmentation, and tracking of multiple objects are jointly handled. This investigation shows how the key concept of compositionality can actually be exploited for both, making learning feasible and rendering recognition computationally tractable. Furthermore, applications in the visual analysis of cultural heritage and in biomedical image analysis will be presented.
(Vortrag auf Einladung der Dozenten der Informatik)
May 3, 2010 12:02:01