High Resolution Trichromatic Road Surface Scanning with a Line Scan Camera and Light Emitting Diode Lighting for Road-Kill Detection.
This paper presents a road surface scanning system that operates with a trichromatic line scan camera with light emitting diode (LED) lighting achieving road surface resolution under a millimeter. It was part of a project named Roadkills-Intelligent systems for surveying mortality of amphibians in Portuguese roads, sponsored by the Portuguese Science and Technology Foundation. A trailer was developed in order to accommodate the complete system with standalone power generation, computer image capture and recording, controlled lighting to operate day or night without disturbance, incremental encoder with 5000 pulses per revolution attached to one of the trailer wheels, under a meter Global Positioning System (GPS) localization, easy to utilize with any vehicle with a trailer towing system and focused on a complete low cost solution. The paper describes the system architecture of the developed prototype, its calibration procedure, the performed experimentation and some obtained results, along with a discussion and comparison with existing systems. Sustained operating trailer speeds of up to 30 km/h are achievable without loss of quality at 4096 pixels' image width (1 m width of road surface) with 250 µm/pixel resolution. Higher scanning speeds can be achieved by lowering the image resolution (120 km/h with 1 mm/pixel). Computer vision algorithms are under development to operate on the captured images in order to automatically detect road-kills of amphibians.
School of Engineering of the University of Minho, Guimarães 4800-058, Portugal. gil@dei.uminho.pt.
Gil
G
Lopes
School of Engineering of the University of Minho, Guimarães 4800-058, Portugal. fernando@dei.uminho.pt.
A Fernando
AF
Ribeiro
Geo-Space Sciences Research Centre, Observatório Astronómico Prof. Manuel de Barros, University of Porto, Vila Nova de Gaia 4430-146, Portugal. neftali.sillero@gmail.com.
Neftalí
N
Sillero
Department of Communication Sciences and Information Technologies, University Institute of Maia, Avioso São Pedro 4475-690, Portugal. lgseco@gmail.com.
Luís
L
Gonçalves-Seco
School of Engineering of the University of Minho, Guimarães 4800-058, Portugal. cristiano.c.s@gmail.com.
Cristiano
C
Silva
School of Engineering of the University of Minho, Guimarães 4800-058, Portugal. apoarmatu@gmail.com.|Geo-Space Sciences Research Centre, Observatório Astronómico Prof. Manuel de Barros, University of Porto, Vila Nova de Gaia 4430-146, Portugal. apoarmatu@gmail.com.
Marc
M
Franch
School of Engineering of the University of Minho, Guimarães 4800-058, Portugal. ptrigueiros@gmail.com.
Paulo
P
Trigueiros
computer vision; line scan camera; pavement inspection; road scanning