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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5621
Title: Unsupervised classification of erroneous video object trajectories
Authors: Ahmed S.A.
Dogra D.P.
Kar S.
Pratim Roy, Partha
Published in: Soft Computing
Abstract: The paper proposes a method to detect failures in object tracking. Detection is done with the help of two types of errors, namely jump and stop errors. Jump errors occur when an abrupt change in object’s motion is observed, whereas stop errors occur when a moving object remains stationary for longer duration at any point. In our framework, moving objects are first tracked using well-known trackers and their trajectories are obtained. Discrepancies between trajectories are measured. We have shown that the proposed method can be reliable for detection of tracking failures. This can help to find error-free trajectories that are essential in various computer vision tasks. We have also shown that the tracking performance can be further improved while processing the output trajectories without much knowledge about the underlying tracking algorithms. The effect of tracking failure is investigated to identify erroneous trajectories. It has been observed that when a tracker fails, velocity profile of the moving object usually changes significantly. Based on this hypothesis, erroneous trajectories are detected and a set of error-free trajectories are marked and grouped. Two recently proposed tracking algorithms, namely real-time compressive tracker (CT) and real-time L1-tracker (L1APG), have been used to track the objects. We have tested our framework on five publicly available datasets containing more than 300 trajectories. Our experiments reveal that average classification rate of erroneous trajectories can be as high as 80.4% when objects are tracked using L1APG tracker. Accuracy can be as high as 81.2% when applied on trajectories obtained using CT tracker. Average accuracy of tracking increases significantly (19.2% with respect to L1APG tracker and 24.8% with respect to CT tracker) when the decision is taken using a fused framework. © 2017, Springer-Verlag Berlin Heidelberg.
Citation: Soft Computing (2018), 22(14): 4703-4721
URI: https://doi.org/10.1007/s00500-017-2656-x
http://repository.iitr.ac.in/handle/123456789/5621
Issue Date: 2018
Publisher: Springer Verlag
Keywords: Object tracking
Tracker fusion
Unsupervised tracking
ISSN: 14327643
Author Scopus IDs: 57190343458
35408975400
55808071612
56880478500
Author Affiliations: Ahmed, S.A., Haldia Institute of Technology, Haldia, India
Dogra, D.P., Indian Institute of Technology, Bhubaneswar, India
Kar, S., National Institute of Technology, Durgapur, India
Roy, P.P., Indian Institute of Technology, Roorkee, India
Corresponding Author: Ahmed, S.A.; Haldia Institute of TechnologyIndia; email: arif.1984.in@ieee.org
Appears in Collections:Journal Publications [CS]

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