Matching Trajectories between Video Sequences by Exploiting a Sparse Projective Invariant Representation

Identifying correspondences between trajectory segments observed from nonsynchronized cameras is important for reconstruction of the complete trajectory of moving targets in a large scene. Such a reconstruction can be obtained from motion data by comparing the trajectory segments and estimating both...

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Bibliographic Details
Published in:IEEE transactions on pattern analysis and machine intelligence 2010-03, Vol.32 (3), p.517-529
Main Authors: Nunziati, W., Sclaroff, S., Del Bimbo, A.
Format: Article
Language:English
Subjects:
Alignment
Applied sciences
Artificial intelligence
Cameras
Computer science
control theory
systems
Computer vision
cross ratio
Exact sciences and technology
Geometry
invariants
Layout
Motion estimation
Moving targets
Pattern recognition. Digital image processing. Computational geometry
Reconstruction
Registration
Representations
Segments
similarity measures
Software
Surveillance
Temporal logic
Testing
Trajectories
Trajectory
Video sequences
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Summary:Identifying correspondences between trajectory segments observed from nonsynchronized cameras is important for reconstruction of the complete trajectory of moving targets in a large scene. Such a reconstruction can be obtained from motion data by comparing the trajectory segments and estimating both the spatial and temporal alignments. Exhaustive testing of all possible correspondences of trajectories over a temporal window is only viable in the cases with a limited number of moving targets and large view overlaps. Therefore, alternative solutions are required for situations with several trajectories that are only partially visible in each view. In this paper, we propose a new method that is based on view-invariant representation of trajectories, which is used to produce a sparse set of salient points for trajectory segments observed in each view. Only the neighborhoods at these salient points in the view-invariant representation are then used to estimate the spatial and temporal alignment of trajectory pairs in different views. It is demonstrated that, for planar scenes, the method is able to recover with good precision and efficiency both spatial and temporal alignments, even given relatively small overlap between views and arbitrary (unknown) temporal shifts of the cameras. The method also provides the same capabilities in the case of trajectories that are only locally planar, but exhibit some nonplanarity at a global level.
ISSN:0162-8828
1939-3539
DOI:10.1109/TPAMI.2009.35