Differentiation of Cracks from Surface Irregularities in Open-Graded Friction Course (OGFC)Pavements Using Digital Image Modeling

Digital image based automated pavement crack evaluation has been replacing the conventional manual surveys due to its improved efficiency and safety. One popular principle employed in software used for automated detection of cracks from pavement images is based on identifying the intensity contrast between the images of the crack and the rest of the pavement surface. However, it has been observed that this technique results in other non-structural pavement surface irregularities being also detected as cracks, particularly in pavements with Open Graded Friction Courses (OGFC). This issue has a major impact on the accuracy of automated distress evaluation and hence software developers have constantly attempted to address this. Furthermore, since pavement management decisions are based on the crack evaluation results, the overestimation of cracks caused by detection of surface irregularities as cracks could cause improper prioritization of pavements and inefficient utilization of rehabilitation and maintenance funds. This paper describes the formulation of additional criteria for elimination of irregularities based on the modeling of the image formation process of cracks and irregularities, using optics. Appropriately calibrated reflection properties of pavement material and the Ward’s Bi-directional Reflection Function are used to model the intensity variations across cracks and irregularities of OGFC pavements separately. Then simple criteria based on the intensity contrast gradient and the variations of intensities are established to accurately differentiate cracks from irregularities. Finally, the theoretically simulated intensity variations and the preliminary differentiation criteria are verified using intensity distributions obtained from images of core samples and those collected from field surveys.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Photos; References; Tables;
  • Pagination: 20p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01152478
  • Record Type: Publication
  • Report/Paper Numbers: 10-3981
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 12:02PM