title: A probabilistic framework for 3D visual object representation.
abstract: We present an object representation framework that encodes probabilistic spatial relations between 3D features and organizes these features in a hierarchy. Features at the bottom of the hierarchy are bound to local 3D descriptors. Higher level features recursively encode probabilistic spatial configurations of more elementary features. The hierarchy is implemented in a Markov network. Detection is carried out by a belief propagation algorithm, which infers the pose of high-level features from local evidence and reinforces local evidence from globally consistent knowledge, effectively producing a likelihood for the pose of the object in the detection scene. We also present a simple learning algorithm that autonomously builds hierarchies from local object descriptors. We explain how to use our framework to estimate the pose of a known object in an unknown scene. Experiments demonstrate the robustness of hierarchies to input noise, viewpoint changes, and occlusions.
authors.affiliation: University of Liège, Belgium. renaud.detry@ulg.ac.be
authors.forename: Renaud
authors.initials: R
authors.lastname: Detry
authors.forename: Nicolas
authors.initials: N
authors.lastname: Pugeault
authors.forename: Justus H
authors.initials: JH
authors.lastname: Piater