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Evaluation of road signs using radiometric and geometric data from terrestrial LiDAR

100%

Gonzalez-Jorge H. , Riveiro B. , Armesto J. , Arias P.

Optica Applicata

2013

tom Vol. 43, nr 3

421--433

Maintenance works are crucial to reduce the risk of accidents. Road signs appear to be one of the most important elements for safety purposes so their inspection is commonly included in the most extended road management systems. The geometric state of the sign is of great importance, especially interesting is its flatness and the inclination relative to the ground. Road signs are printed with reflective paints to maximize the visibility to the drivers. This coating produces a high reflected radiation that is easily recorded by the photoelectric detector of the laser scanner mechanisms. It allows establishing an intensity based filter in order to perform the 3D classification of the road sign. In this work, a number of road signs are evaluated, under a geometric point of view, using the laser scanner Riegl LMS Z390i. A Matlab algorithm is developed for all the data processing (3D classification and evaluation of geometric parameters). Results do not show the evidence of folded or abnormally tilted signs. The developed algorithms open the possibility of using the attribute of intensity of laser scanning data for classification purposes, during the automatic evaluation of the condition state of road signs. Such algorithms could increase the productivity and reliability of the inspection works.

Zapis obrazu drogi i pozycji w ocenie efektywności systemów transportowych

51%

Pałczyński T. , Pawelski Z.

tom [nr] 6 (26)

54-61

Prezentujemy koncepcję zestawu pomiarowego do zapisu obrazu drogi z wykorzystaniem pozycji pojazdu w oparciu o technologię GPS - INS - RTK, który może być wykorzystany do inspekcji dróg, a także do oceny efektywności systemów transportowych, gdzie wymagana jest silna korelacja obrazu z kamery z jej pozycją.

At this paper there will be presented road image recording unit supported with vehicle position based on GPS-INS-RTK technology. "Megapixel" camera was applied to measurement equipment to record road images. SPAN system from NOVATEL firm was used to define accurate vehicle position, which consist of: GPS receiver, inertial unit, radio modem-enables system work at RTK - 2 technology. There is activated network connection between GPS system and ASGEUPOS server via radio modem and thanks to that there is received reference correction on the level +/- 2 cm. Proposed measurement equipment can be used at road inspection and any other tasks at transport area which expects high correlation between camera image and their position. Proposed measurement system can be used at road inspection and at transport system efficient description, when there is demanded high correlation between camera image and their position.