Road Surface Cracks Detection Using Unsupervised Strategies

- Oliveira, H.; Correia, P.L.;

"Road Surface Cracks Detection Using Unsupervised Strategies ", Proc Portuguese Conf. on Pattern Recognition - RecPad , Aveiro , Portugal , Vol. . , pp. . - . , October , 2009 .

Abstract

This paper describes and compares two unsupervised classification strategies to detect cracks on flexible road pavement surface images. The first strategy uses a Bayesian classifier; the second is based on one-class classifiers. A simple two dimensional feature space is considered, exploiting the mean and the standard deviation of the pixel’s gray levels, computed for non-overlapping image regions. For both strategies a bivariate class-conditional normal density is adopted, for stochastic data modeling, as it produces a good description of the data. Several normalization steps are proposed, to achieve better final results. Experimental crack detection results are presented based on real images taken from Portuguese roads.