Re-Identification in Urban Scenarios: A Review of Tools and Methods

With the widespread use of surveillance image cameras and enhanced awareness of public security, objects, and persons Re-Identification (ReID), the task of recognizing objects in non-overlapping camera networks has attracted particular attention in computer vision and pattern recognition communities...

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Autores principales:	Hugo S. Oliveira, José J. M. Machado, João Manuel R. S. Tavares
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	person ReID computer vision deep neural networks image enhancement Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8c1ff8c9d6014bcabaef03913bb6bc43
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spelling	oai:doaj.org-article:8c1ff8c9d6014bcabaef03913bb6bc432021-11-25T16:38:32ZRe-Identification in Urban Scenarios: A Review of Tools and Methods10.3390/app1122108092076-3417https://doaj.org/article/8c1ff8c9d6014bcabaef03913bb6bc432021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10809https://doaj.org/toc/2076-3417With the widespread use of surveillance image cameras and enhanced awareness of public security, objects, and persons Re-Identification (ReID), the task of recognizing objects in non-overlapping camera networks has attracted particular attention in computer vision and pattern recognition communities. Given an image or video of an object-of-interest (query), object identification aims to identify the object from images or video feed taken from different cameras. After many years of great effort, object ReID remains a notably challenging task. The main reason is that an object’s appearance may dramatically change across camera views due to significant variations in illumination, poses or viewpoints, or even cluttered backgrounds. With the advent of Deep Neural Networks (DNN), there have been many proposals for different network architectures achieving high-performance levels. With the aim of identifying the most promising methods for ReID for future robust implementations, a review study is presented, mainly focusing on the person and multi-object ReID and auxiliary methods for image enhancement. Such methods are crucial for robust object ReID, while highlighting limitations of the identified methods. This is a very active field, evidenced by the dates of the publications found. However, most works use data from very different datasets and genres, which presents an obstacle to wide generalized DNN model training and usage. Although the model’s performance has achieved satisfactory results on particular datasets, a particular trend was observed in the use of 3D Convolutional Neural Networks (CNN), attention mechanisms to capture object-relevant features, and generative adversarial training to overcome data limitations. However, there is still room for improvement, namely in using images from urban scenarios among anonymized images to comply with public privacy legislation. The main challenges that remain in the ReID field, and prospects for future research directions towards ReID in dense urban scenarios, are also discussed.Hugo S. OliveiraJosé J. M. MachadoJoão Manuel R. S. TavaresMDPI AGarticleperson ReIDcomputer visiondeep neural networksimage enhancementTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10809, p 10809 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	person ReID computer vision deep neural networks image enhancement Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	person ReID computer vision deep neural networks image enhancement Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Hugo S. Oliveira José J. M. Machado João Manuel R. S. Tavares Re-Identification in Urban Scenarios: A Review of Tools and Methods
description	With the widespread use of surveillance image cameras and enhanced awareness of public security, objects, and persons Re-Identification (ReID), the task of recognizing objects in non-overlapping camera networks has attracted particular attention in computer vision and pattern recognition communities. Given an image or video of an object-of-interest (query), object identification aims to identify the object from images or video feed taken from different cameras. After many years of great effort, object ReID remains a notably challenging task. The main reason is that an object’s appearance may dramatically change across camera views due to significant variations in illumination, poses or viewpoints, or even cluttered backgrounds. With the advent of Deep Neural Networks (DNN), there have been many proposals for different network architectures achieving high-performance levels. With the aim of identifying the most promising methods for ReID for future robust implementations, a review study is presented, mainly focusing on the person and multi-object ReID and auxiliary methods for image enhancement. Such methods are crucial for robust object ReID, while highlighting limitations of the identified methods. This is a very active field, evidenced by the dates of the publications found. However, most works use data from very different datasets and genres, which presents an obstacle to wide generalized DNN model training and usage. Although the model’s performance has achieved satisfactory results on particular datasets, a particular trend was observed in the use of 3D Convolutional Neural Networks (CNN), attention mechanisms to capture object-relevant features, and generative adversarial training to overcome data limitations. However, there is still room for improvement, namely in using images from urban scenarios among anonymized images to comply with public privacy legislation. The main challenges that remain in the ReID field, and prospects for future research directions towards ReID in dense urban scenarios, are also discussed.
format	article
author	Hugo S. Oliveira José J. M. Machado João Manuel R. S. Tavares
author_facet	Hugo S. Oliveira José J. M. Machado João Manuel R. S. Tavares
author_sort	Hugo S. Oliveira
title	Re-Identification in Urban Scenarios: A Review of Tools and Methods
title_short	Re-Identification in Urban Scenarios: A Review of Tools and Methods
title_full	Re-Identification in Urban Scenarios: A Review of Tools and Methods
title_fullStr	Re-Identification in Urban Scenarios: A Review of Tools and Methods
title_full_unstemmed	Re-Identification in Urban Scenarios: A Review of Tools and Methods
title_sort	re-identification in urban scenarios: a review of tools and methods
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8c1ff8c9d6014bcabaef03913bb6bc43
work_keys_str_mv	AT hugosoliveira reidentificationinurbanscenariosareviewoftoolsandmethods AT josejmmachado reidentificationinurbanscenariosareviewoftoolsandmethods AT joaomanuelrstavares reidentificationinurbanscenariosareviewoftoolsandmethods
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Re-Identification in Urban Scenarios: A Review of Tools and Methods

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