Publication Details

Geometric Alignment by Deep Learning for Recognition of Challenging License Plates

ŠPAŇHEL, J.; SOCHOR, J.; JURÁNEK, R.; HEROUT, A. Geometric Alignment by Deep Learning for Recognition of Challenging License Plates. In 2018 21st International Conference on Intelligent Transportation Systems (ITSC). Lahaina, Maui: IEEE Intelligent Transportation Systems Society, 2018. p. 3524-3529. ISBN: 978-1-72810-321-1. ISSN: 2153-0017.
Czech title
Rozpoznání obtížných registračních značek pomocí geometrické zarovnání hlubokým učením
Type
conference paper
Language
English
Authors
Špaňhel Jakub, Ing., Ph.D. (DCGM)
Sochor Jakub, Ing., Ph.D.
Juránek Roman, Ing., Ph.D. (DCGM)
Herout Adam, prof. Ing., Ph.D. (DCGM)
URL
Keywords

License Plate Recognition, CNN, License Plate
Dataset, Image Alignment, Intelligent Transportation Systems

Abstract

In this paper, we explore the problem of license
plate recognition in-the-wild (in the meaning of capturing data
in unconstrained conditions, taken from arbitrary viewpoints
and distances). We propose a method for automatic license
plate recognition in-the-wild based on a geometric alignment
of license plates as a preceding step for holistic license plate
recognition. The alignment is done by a Convolutional Neural
Network that estimates control points for rectifying the image
and the following rectification step is formulated so that the
whole alignment and recognition process can be assembled into
one computational graph of a contemporary neural network
framework, such as Tensorflow. The experiments show that the
use of the aligner helps the recognition considerably: the error
rate dropped from 9.6 % to 2.1 % on real-life images of license
plates. The experiments also show that the solution is fast - it
is capable of real-time processing even on an embedded and
low-power platform (Jetson TX2). We collected and annotated
a dataset of license plates called CamCar6k, containing 6,064
images with annotated corner points and ground truth texts.
We make this dataset publicly available.

Published
2018
Pages
3524–3529
Proceedings
2018 21st International Conference on Intelligent Transportation Systems (ITSC)
Number
21
Conference
21st IEEE International Conference on Intelligent Transportation Systems, Maui, Hawaii, US
ISBN
978-1-72810-321-1
Publisher
IEEE Intelligent Transportation Systems Society
Place
Lahaina, Maui
DOI
10.1109/ITSC.2018.8569259
UT WoS
000457881303079
EID Scopus
2-s2.0-85060438912
BibTeX 
@inproceedings{BUT155105,
  author="Jakub {Špaňhel} and Jakub {Sochor} and Roman {Juránek} and Adam {Herout}",
  title="Geometric Alignment by Deep Learning for Recognition of Challenging License Plates",
  booktitle="2018 21st International Conference on Intelligent Transportation Systems (ITSC)",
  year="2018",
  number="21",
  pages="3524--3529",
  publisher="IEEE Intelligent Transportation Systems Society",
  address="Lahaina, Maui",
  doi="10.1109/ITSC.2018.8569259",
  isbn="978-1-72810-321-1",
  issn="2153-0017",
  url="https://ieeexplore.ieee.org/document/8569259"
}
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