Person Re-Identification in Surveillance Videos using Deep Learning based Body Part Partition and Gaussian Filtering

Year 2020, Ejosat Special Issue 2020 (ISMSIT), 291 - 296, 30.11.2020

Fatih Aksu Cem Direkoğlu

https://doi.org/10.31590/ejosat.823257

Abstract

In this paper, we concentrate on Person Re-Identification (Re-ID) that consists of searching for a person who has been previously observed over a camera network. Person Re-ID is important for searching suspicious or missing persons if we have sample images of the person of interest. Despite the fact that there are many researches on vision-based Person re-identification, it still remains a challenging problem. We propose a person re-identification system using a deep learning based human body part segmentation, and Gaussian filtering based smooth mask generation. A semantic partition technique is used to segment human body parts and generate local binary masks. These masks are deterministic binary images. These binary masks have strict boundaries, and we lose some features with these deterministic masks. Therefore, we apply Gaussian filter for smoothing masks so that features near the boundaries are also taken into account slightly. These smooth masks are applied to the final feature maps generated at the end of network on contrary to other methods which apply mask at the beginning or in the middle of the deep learning network. Therefore, our work is new and different from other works because of using semantic partition and masking at the end of network, as well as our mask are smoothed with Gaussian filter to handle errors during the partitioning stage. We use a well-known pre-trained network, namely ResNet-50, to extract global features, and a method called Cross-Domain Complementary Learning for human body partitioning. Applying Gaussian filtered smooth local masks to the global features, which are extracted at the end of Resnet-50 network, increases the performance of Person Re-Identification system. Evaluation is conducted on a commonly accepted Market-1501 dataset, and results are promising.

Keywords

Person Re-Identification, feature extraction, classification, Deep Learning, Convolutional Neural Networks

Supporting Institution

Middle East Technical University – Northern Cyprus Campus Scientific Research Project Fund

Project Number

Grant no: FEN-19-D-3

Derin Öğrenme Tabanlı Vücut Bölme ve Gaussian Filtreleme Kullanarak Gözetim Videolarında Kişiyi Yeniden Tanıma

Abstract

Bu makalede, daha önce bir kamera ağı üzerinden gözlemlenen bir kişiyi aramak için Kişiyi Yeniden Tanıma (Person Re-Identification) sistemi üzerine yoğunlaşıyoruz. Kişiyi Yeniden Tanıma önemli bir iştir. Örnek olarak kayıp veya şüpheli bir kişinin görüntüleri bulunuyorsa, Kişiyi Yeniden Tanıma sistemi, kişiyi video görüntülerinden bulunmasını sağlayabilir. Bu alanda kişinin yeniden tanımlanmasına ilişkin birçok araştırma olmasına rağmen, bu hala zor bir problem olmaya devam etmektedir ve birçok araştırma bu alanda devam etmektedir. Bu sorunu çözmek amacıyla, makalemizde derin öğrenme tabanlı insan vücudu bölümü bölümleme ve Gaussian filtreleme tabanlı pürüzsüz maske üretimi kullanarak Kişiyi Yeniden Tanıma Sistemi sunuyoruz. İnsan vücudu parçalarını bölümlere ayırmak ve yerel ikili maskeler oluşturmak için anlamsal bir bölme tekniği kullanıyoruz. Bu maskeler deterministik ikili görüntülerdir. Bu ikili maskelerin katı sınırları vardır ve bu deterministik maskelerle bazı özelliklerin kaybedilmesine sebep verip, performansı düşürmektedir. Bu nedenle, maskeleri pürüzsüz hale getirebilmek için Gaussian filtresi uyguluyoruz, böylece sınırlara yakın özellikler de performansa biraz katkı sağlıyor. Bizim geliştirdiğimiz metodumuzda, bu pürüzsüz maskeler, derin öğrenme ağının başında veya ortasında maske uygulayan diğer yöntemlerin aksine, ağın sonunda oluşturulan son özellik haritalarına uygulanmaktadır. Bu nedenle, işimiz yeni ve diğer çalışmalardan farklıdır çünkü ağın sonunda anlamsal bölümleme ve maskeleme kullanmanın yanı sıra bölümleme aşamasında hataları gidermek için maskemiz Gaussian filtresi ile pürüzsüz hale getirilmiştir. Global özellikleri çıkarmak için iyi bilinen önceden eğitilmiş bir ağ olan ResNet-50'yi ve insan vücudunun bölümlenmesi için Alanlar Arası Tamamlayıcı Öğrenme adlı bir yöntemi kullanıyoruz. Resnet-50 ağının sonunda çıkarılan global özelliklere Gaussian filtreli pürüzsüz yerel maskelerin uygulanması, kişiyi yeniden tanıma sisteminin performansını artıryor. Değerlendirme, yaygın olarak kabul edilen Market-1501 veri kümesi üzerinde gerçekleştirilmiştir ve sonuçlar umut vericidir.

Keywords

Kişiyi Yeniden Tanıma, özellik çıkarma, sınıflandırma, Derin Öğrenme, Evrişimli Sinir Ağları

Project Number

Grant no: FEN-19-D-3

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