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Journal of Electronic Imaging

Person re-identification employing 3D scene information
Author(s): Slawomir Bak; Francois Brémond
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Paper Abstract

The person reidentification task applied in a real-world scenario is addressed. Finding people in a network of cameras is challenging due to significant variations in lighting conditions, different color responses, and different camera viewpoints. State-of-the-art algorithms are likely to fail due to serious perspective and pose changes. Most of the existing approaches try to cope with all these changes by applying metric learning tools to find a transfer function between a camera pair while ignoring the body alignment issue. Additionally, this transfer function usually depends on the camera pair and requires labeled training data for each camera. This might be unattainable in a large camera network. We employ three-dimensional scene information for minimizing perspective distortions and estimating the target pose. The estimated pose is further used for splitting a target trajectory into reliable chunks, each one with a uniform pose. These chunks are matched through a network of cameras using a previously learned metric pool. However, instead of learning transfer functions that cope with all appearance variations, we propose to learn a generic metric pool that only focuses on pose changes. This pool consists of metrics, each one learned to match a specific pair of poses and not being limited to a specific camera pair. Automatically estimated poses determine the proper metric, thus improving matching. We show that metrics learned using only a single camera can significantly improve the matching across the whole camera network, providing a scalable solution. We validated our approach on publicly available datasets, demonstrating increase in the reidentification performance.

Paper Details

Date Published: 23 October 2015
PDF: 9 pages
J. Electron. Imag. 24(5) 051007 doi: 10.1117/1.JEI.24.5.051007
Published in: Journal of Electronic Imaging Volume 24, Issue 5
Show Author Affiliations
Slawomir Bak, INRIA Sophia Antipolis - Méditerranée (France)
Francois Brémond, INRIA Sophia Antipolis - Méditerranée (France)

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