Segmentation of traffic signs from poles with mathematical morphology applied to point clouds

Segmentation of traffic signs from poles with mathematical morphology applied to point clouds

Balado Frías, J. (TU Delft GIS Technologie; Universidade de Vigo, Vigo)
Soilán, M. (University of Salamanca)
Díaz-Vilarino, L. (TU Delft GIS Technologie; Universidade de Vigo, Vigo)
van Oosterom, P.J.M. (TU Delft GIS Technologie)

2021

Traffic signs are one of the most relevant road assets for driving, as the safety of drivers depends to a great extent on their correct location. In this paper two methods are compared for the segmentation of the sign and the pole supporting it. Both methods are based on the morphological opening to identify the sign points, the first one directly employs the mathematical morphology directly applied to point clouds and the second one through point cloud rasterization into images. The comparison was conducted on twenty real traffic signs acquired with Mobile Laser Scanning obtaining point clouds from environments with signposts, traffic lights and lampposts. The results showed a correct segmentation of the signs, obtaining a F-score of 0.81 by the point-based method and a 0.75 by 2D image method. In particular, the point-based mathematical morphology proved to be more accurate in the segmentation of traffic sings installed on traffic lights and lampposts, avoiding over detection shown by the 2D image method.

Image processing
Mathematical morphology
Mobile Laser Scanning
Morphological opening
Topographic LiDAR
Traffic signs

http://resolver.tudelft.nl/uuid:1dd37a8e-0e82-4dde-a1a5-17f7a0c7077b

https://doi.org/10.5194/isprs-annals-V-2-2021-145-2021

2194-9042

ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences, 5 (2), 145-151

2021 24th ISPRS Congress on Imaging Today, Foreseeing Tomorrow, Commission II, 2021-07-05 → 2021-07-09, Nice, France

Institutional Repository

journal article

© 2021 J. Balado Frías, M. Soilán, L. Díaz-Vilarino, P.J.M. van Oosterom