Unconstrained License Plate Detection in Hardware

Petr Musil, Roman Juránek, Pavel Zemčík

2021

Abstract

In this paper, we propose an FPGA implementation of license plate detection (LPD) in images captured by arbitrarily placed cameras, vehicle-mounted cameras, or even handheld cameras. In such images, the license plates can appear in a wide variety of positions and angles. Thus we cannot rely on a-priori known geometric properties of the license plates as many contemporary applications do. Unlike the existing solutions targeted for DSP, FPGA or similar low power devices, we do not make any assumptions about license plate size and orientation in the image. We use multiple sliding window detectors based on simple image features, each tuned to a specific range of projections. On a dataset captured by a camera mounted on a vehicle, we show that detection rate is 98 % (and 98.7 % when combined with video tracking). We demonstrate that our FPGA implementation can process 1280×1024 pixel image at over 40 FPS with a minimum width of detected license plates approximately 100 pixels. The FPGA block is fully functional and it is intended to be used in a smart camera to parking control in residential zones.

Paper Citation

in Harvard Style

Musil P., Juránek R. and Zemčík P. (2021). Unconstrained License Plate Detection in Hardware. In Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems - Volume 1: VEHITS, ISBN 978-989-758-513-5, pages 13-21. DOI: 10.5220/0010174000130021

in Bibtex Style

@conference{vehits21,
author={Petr Musil and Roman Juránek and Pavel Zemčík},
title={Unconstrained License Plate Detection in Hardware},
booktitle={Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems - Volume 1: VEHITS,},
year={2021},
pages={13-21},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0010174000130021},
isbn={978-989-758-513-5},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 7th International Conference on Vehicle Technology and Intelligent Transport Systems - Volume 1: VEHITS,
TI - Unconstrained License Plate Detection in Hardware
SN - 978-989-758-513-5
AU - Musil P.
AU - Juránek R.
AU - Zemčík P.
PY - 2021
SP - 13
EP - 21
DO - 10.5220/0010174000130021