00933636

Monograph

http://onlinepubs.trb.org...y/NCHRP81_Final_Report.pdf

This Innovations Deserving Exploratory Analysis (IDEA) project developed and tested an automated real-time crack detection and analysis system based on image processing and computer vision techniques. The system consists of a personal computer, a frame grabber with two on-board processors, a distance sensor and a video camera mounted on top of a van. The images from the video camera are captured and converted to digital images by the frame grabber, while the images are recorded by the video camera for future reference. Over 20,000 images were obtained under different vehicle speeds and light conditions and digitized. Processing algorithms were developed and applied to the collected images. The effectiveness and speed of the algorithms were improved for features such as segmentation, enhancement, noise removal, Hugh transformation and morphology, etc., for crack detection and classification applications. Three evaluation criteria were used: performance for different pavement types including cracks, sealed cracks and shadows, performance under different light conditions and circumstances, and performance when there are some tars (bleeding) or other non-crack scenes on the images. Pavement images were obtained with vehicle speeds of 35 mph to 75 mph under different lighting conditions, including both cloudy and sunny days. The results demonstrate that the proposed system can accurately process the images of different types of pavements and under different lighting conditions, including the shadows.

This NCHRP-IDEA investigation was conducted by Utah State University. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

NCHRP-IDEA Project 81

NCHRP-81

English

20 p.

2002-10

NCHRP-IDEA Program Project Final Report

9908-0204

Figures (13) ; References (18)

Algorithms; Automatic data collection systems; Classification; Computer vision; Digitized photography; Image processing; Lighting; Pavement cracking; Personal computers; Real time data processing; Sensors; Speed; Technological innovations; Types of pavements; Vans; Video cameras

Frame grabbers

Highways; Pavements; I23: Properties of Road Surfaces

TRIS, TRB

Nov 6 2002 12:00AM