Extraction and clustering of motion trajectories in video

A system that tracks moving objects in a video dataset so as to extract a representation of the objects' 3D trajectories is described. The system then finds hierarchical clusters of similar trajectories in the video dataset. Objects' motion trajectories are extracted via an EKF formulation...

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Bibliographic Details
Main Authors: Buzan, D., Sclaroff, S., Kollios, G.
Format: Conference Proceeding
Language:English
Subjects:
Clustering algorithms
Discrete Fourier transforms
Motion estimation
Object detection
Optical filters
Remote monitoring
Surveillance
Tracking
Trajectory
Video sequences
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Description
Summary:A system that tracks moving objects in a video dataset so as to extract a representation of the objects' 3D trajectories is described. The system then finds hierarchical clusters of similar trajectories in the video dataset. Objects' motion trajectories are extracted via an EKF formulation that provides each object's 3D trajectory up to a constant factor. To increase accuracy when occlusions occur, multiple tracking hypotheses are followed. For trajectory-based clustering and retrieval, a modified version of edit distance, called longest common subsequence is employed. Similarities are computed between projections of trajectories on coordinate axes. Trajectories are grouped based, using an agglomerative clustering algorithm. To check the validity of the approach, experiments using real data were performed.
ISSN:1051-4651
2831-7475
DOI:10.1109/ICPR.2004.1334287