Einladung zur öffentlichen Disputation

von Herrn Jianhua Zhang

Donnerstag, 12. Juli 2012 um 14:30 Uhr
Informatikum, Vogt-Kölln-Str. 30, Raum F-334

"Explore Objects and Categories in Unexplored Environments Based on Multimodal Data"

Abstract:

The execution of computer vision tasks in such environments requires the ability of detecting category-independent objects and discovering novel object categories. In this thesis, a set of novel methods is presented to explore objects and categories in unexplored environments based on multimodal data (i.e. the 2D images and 3D point clouds).

Concerning the first problem, this thesis proposes a set of novel category-independent object features and develops a cross-modal co-segmentation method to simultaneously segment paired images and 3D point clouds, which can detect and localize multiple category-independent object instances without sampling extra regions.By comparison with state-of-the-art methods, experimental results on a public RGB+D dataset show that the proposed method yields a promising performance.

Then a dynamic category hierarchy is proposed to improve object recognition and discover novel categories for the second problem. First, multimodal object attributes are extended from 2D ones to describe objects. A supervised hierarchical latent Dirichlet allocation model (shLDA) is presented to organize a large scale number of categories. The dynamic category hierarchy is based on the multimodal attributes and the shLDA model and can effectively discover and learn novel categories. Experiments show the promising performance of object recognition and novel category discovery by comparing with state-of-the-art methods.

Alle Mitglieder des Fachbereichs Informatik sind zu dieser öffentlichen Veranstaltung herzlich eingeladen.

Kontakt:

Prof. Dr. Christopher Habel
Vorsitzender des Promotionsprüfungsausschusses