Technical Program

Paper Detail

Paper:IMDSP-L1.3
Session:Image and Video Analysis
Time:Wednesday, May 19, 13:40 - 14:00
Presentation: Lecture
Topic: Image and Multidimensional Signal Processing: Image and Video Analysis
Title: JOINT SPACE-TIME IMAGE SEQUENCE SEGMENTATION: OBJECT TUNNELS AND OCCLUSION VOLUMES
Authors: Mirko Ristivojević; Boston University 
 Janusz Konrad; Boston University 
Abstract: Spatial segmentation of image sequences is usually performed based on motion between two frames. Some recent approaches extend this to joint segmentation in space-time; the resulting 3-D segmentation (in x-y-t space) can be interpreted as a volume ``carved out'' by a moving object in the image sequence domain, or the so-called ``object tunnel''. In this paper, we extend this concept to explicit modeling of occlusion events in the x-y-t space. In addition to the modeling of object evolution, we also model occluded and newly-exposed areas in the background and in the object by means of ``occlusion volume'', a new space-time concept. We propose a variational formulation of the problem that we solve using the multiphase level set method. We show experimental results for synthetic and natural image sequences.
 
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