Fg. Meyer et P. Bouthemy, REGION-BASED TRACKING USING AFFINE MOTION MODELS IN LONG IMAGE SEQUENCES, CVGIP. Image understanding, 60(2), 1994, pp. 119-140
Citations number
40
Categorie Soggetti
Computer Sciences, Special Topics","Computer Science Software Graphycs Programming
This work investigates a new approach to the tracking of regions in an
image sequence. The approach relies on two successive operations: det
ection and discrimination of moving targets and then pursuit of the ta
rgets. A motion-based segmentation algorithm, previously developed in
the laboratory, provides the detection and discrimination stage. This
paper emphaizes the pursuit stage. A pursuit algorithm has been design
ed that directly tracks the region representing the projection of a mo
ving object in the image, rather than relying on the set of trajectori
es of individual points or segments. The region tracking is based on t
he dense estimation of an affine model of the motion field within each
region, which makes it possible to predict the position of the target
in the next frame. A multiresolution scheme provides reliable estimat
es of the motion parameters, even in the case of large displacements.
Two interacting linear dynamic systems describe the temporal evolution
of the geometry and the motion of the tracked regions. Experiments co
nducted on real images demonstrate that the approach is robust against
occulusion and can handle large interframe displacements and complex
motions. (C) 1994 Academic Press, Inc.