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Sensors 2012, 12(9), 12153-12168; doi:10.3390/s120912153

Recognition Stage for a Speed Supervisor Based on Road Sign Detection

*  and
Intelligent Systems Lab, Universidad Carlos III de Madrid, Avda de la Universidad 30, 28911 Leganes, Spain
* Author to whom correspondence should be addressed.
Received: 23 July 2012 / Revised: 30 August 2012 / Accepted: 31 August 2012 / Published: 5 September 2012
(This article belongs to the Special Issue New Trends towards Automatic Vehicle Control and Perception Systems)
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Traffic accidents are still one of the main health problems in the World. A number of measures have been applied in order to reduce the number of injuries and fatalities in roads, i.e., implementation of Advanced Driver Assistance Systems (ADAS) based on image processing. In this paper, a real time speed supervisor based on road sign recognition that can work both in urban and non-urban environments is presented. The system is able to recognize 135 road signs, belonging to the danger, yield, prohibition obligation and indication types, and sends warning messages to the driver upon the combination of two pieces of information: the current speed of the car and the road sign symbol. The core of this paper is the comparison between the two main methods which have been traditionally used for detection and recognition of road signs: template matching (TM) and neural networks (NN). The advantages and disadvantages of the two approaches will be shown and commented. Additionally we will show how the use of well-known algorithms to avoid illumination issues reduces the amount of images needed to train a neural network.
Keywords: ADAS; detection; recognition; road signs; pattern matching; neural network ADAS; detection; recognition; road signs; pattern matching; neural network
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Carrasco, J.-P.; de la Escalera, A.E.; Armingol, J.M. Recognition Stage for a Speed Supervisor Based on Road Sign Detection. Sensors 2012, 12, 12153-12168.

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