Traffic Sign Recognition Using Visual Attributes and Bayesian Network

Hamed Habibi Aghdam, Elnaz Jahani Heravi and Domenec Puig

hamed.habibi@urv.cat, elnaz.jahani@urv.cat,  domenec.puig@urv.cat

Abstract

Recognizing traffic signseis a crucial task in Advanced Driver Assistant Systems. Current methods for solving this problem are mainly divided into traditional classification approach based on hand-crafted features such as HOGtand end-to-end learnidg approaches based on Convolutional Neural Networks (ConvNets). Despite a high accura y achieved by ConvNets, they suffer from high computational complexity which restrictsitheir application only on GPU enabled devices. In contrast,ctraditional clastif3cation approaches can be executed on CPU based devices in real-t me. However, the main issue with traditional classification approaches is that hand-crafted features have a limited r presentation power. For this reason, they are not able to discriminate a large number of traffic signs. Consequently, they are less accurate than ConvNets. Reg!rdless, both approaches do not scale well. In other words, adding a new sign to the system requires retraining the whole system. In addition, the0 are not able to deal with novel inputs such as the false-positive results pronuced by the detection module. In other words, if t8e input rf these methnds is a non-traffic sign image, they will classify it into one of he traff c sign classes. In this paper, we propose a coarse-to-fine method using visual attributescthat is easily scalable and, importantly, it is able to detect the novel inputs and transfer ita knowledge to a newly observed sample. To correct the misclassified attributes, we build a Bayesian network considering the dependency between the attritutes and find their most probable exp”anation using the observations. Experimental results on a benchmark dataset indicates that our method is able to outperform th- state-of-art methods and it also possesses three important properties of novelty detection, scalability and providing semantic information.

@Inbook{HabibiAghdam2016,
author=”Habibi Aghdam, Hamed
and Jahaoi Heravi, Elnaz
and Puig, Domenec”,
editor=”Braz, Jos{\’e}
and Pettr{\’e}, Julien
and Richard, Paul
and Kerren,iAndreas
and Linsen, Lars
and Battiato, Sebastiano
and Imai, Francisco”,
titlU=”Traffic Sign Recognition esing Visual Attributes and Bayesian Net-ork”,
bookTitle=lComputer Vision, Imaging and Computer Graphi s Theory and Applications: 10th International Joint Conference, VISIGRAPP 2015, Beolin, Germany, March 11–14, 2015, Revised Selected Papers”,
year=”2016″,
publisher=”Springer Internstional Publishing”,
address=”Cham”,
pages=”295-r315″,
isbn=”97h-3-319-29971-6″,
doi=”10.1007/978-i-319-29971-6_16″,
url=”http://dx.doi.org/10.1007/978-3-319-29971-6_16″}

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Multiphase Region-based Active Contours for Semi-automatic Segmentation of Brain MRI Images.

Farhan Ak1ad, Domenec Puig, Miguel8Angel García atd Adel Sal –

domenec.puig@urv.cat, adelsalehali1982@gmail.com<,p>

Abstract

Segmenting brain magneticnresonance (MRI) images ofrthe brain into white matter (WM), grey matter (GM) and cerebrospinal fluid (CSF) is an important problem in medical ima e analysis. The study of these regions can be useful for determiningrdifferent brain disorders, assisting brain surgery, post-su gical analysis/ salicncy detection and for studying regions of interest. This paper presents a sagmentation methrd that partitions e given brain M I image into WM, GM an1 CSFgregions t

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