DEVELOPMENT OF A MANUAL CRACK QUANTIFICATION AND AUTOMATED CRACK MEASUREMENT SYSTEM

The objective of this research was to (1) develop a manual image analysis system (MIAS), (2) verify outputs provided by a consultant, and (3) develop an automated image analysis system (AIAS). The MIAS was designed in consultation with Iowa Department of Transportation personnel. It allows them to process digital images interactively through a computer screen in the most efficient manner. For each image, the manually processed data are stored automatically in the database to verify the outputs provided by the consultant. A total of 1,585 images from the consultant were processed using the MIAS. A robust tile-based automated crack imaging software package was developed, which can compute unified crack index and crack type index. First, the image is overlaid with a tile of predetermined dimensions, such as 6 in. x 6 in. of a pavement surface. To improve the accuracy of the automated crack imaging procedure, a variable optimum threshold level was then applied for classifying a tile as cracked or not. Using 10 sample images, the AIAS result was compared against the one produced by MIAS resulting in 3.4% precision and -3.4% bias.

• Record URL:
  http://publications.iowa.gov/archive/00002423/01/tr457.pdf
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/39319
• Corporate Authors:

  University of Iowa, Iowa City

  Department of Civil and Environmental Engineering
  Iowa City, IA  United States  52242

  Iowa Department of Transportation

  800 Lincoln Way
  Ames, IA  United States  50010
• Authors:
  • Lee, H
  • Kim, J
• Publication Date: 2005-1

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 21 p.

Subject/Index Terms

• TRT Terms: Accuracy; Data storage; Image analysis; Pavement cracking; Precision; Software packages
• Subject Areas: Highways; Pavements; I23: Properties of Road Surfaces;

Filing Info

• Accession Number: 00989325
• Record Type: Publication
• Report/Paper Numbers: Project TR-457,, Final Report
• Files: NTL, TRIS, STATEDOT
• Created Date: Apr 29 2005 12:00AM