Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Pavement Crack Classification via Spatial Distribution Features | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 649675 12 pages doi 2011 649675 Research Article Pavement Crack Classification via Spatial Distribution Features Qingquan Li 1 2 Qin Zou 1 2 and Xianglong Liu1 3 1 Transportation Research Center Wuhan University Wuhan 430079 China 2 School of Remote Sensing and Information Engineering Wuhan University Wuhan 430079 China 3 China Academy of Transportation Sciences Ministry of Transport Beijing 100013 China Correspondence should be addressed to Qingquan Li qqli@ Received 18 December 2010 Revised 26 February 2011 Accepted 8 March 2011 Academic Editor Mark Liao Copyright 2011 Qingquan Li et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Pavement crack types provide important information for making pavement maintenance strategies. This paper proposes an automatic pavement crack classification approach exploiting the spatial distribution features . direction feature and density feature of the cracks under a neural network model. In this approach a direction coding D-Coding algorithm is presented to encode the crack subsections and extract the direction features and a Delaunay Triangulation technique is employed to analyze the crack region structure and extract the density features. As regarding skeletonized crack sections rather than crack pixels the spatial distribution features hold considerable feature significance for each type of cracks. Empirical study indicates a classification precision of over 98 of the proposed approach. 1. Introduction Pavement crack types are important for pavement dilapidation analysis and pavement maintenance decision-making. For asphalt pavements the pavement cracks can generally be classified into four types the transverse crack the longitudinal crack .
