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Person re-identification employing 3D scene information

Slawomir Bak 1 Francois Bremond 1
1 STARS - Spatio-Temporal Activity Recognition Systems
CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : This paper addresses the person re-identification task applied in a real-world scenario. Finding people in a network of cameras is challenging due to significant variations in lighting conditions, different colour responses and different camera viewpoints. State of the art algorithms are likely to fail due to serious perspective and pose changes. Most of 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. In this paper we employ 3D scene information for minimising perspective distortions and estimating the target pose. The estimated pose is further used for splitting a target trajectory into the 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, 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 re-identification performance.
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https://hal.inria.fr/hal-01213036
Contributor : Slawomir Bak <>
Submitted on : Wednesday, October 7, 2015 - 4:39:12 PM
Last modification on : Tuesday, July 24, 2018 - 3:48:03 PM
Long-term archiving on: : Friday, January 8, 2016 - 10:45:54 AM

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Slawomir Bak, Francois Bremond. Person re-identification employing 3D scene information. Journal of Electronic Imaging, SPIE and IS&T, 2015. ⟨hal-01213036⟩

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