This paper introduces a method for extracting the outline of crack-type diseases on high-grade highway pavement using digital image technology. Using a high-speed black-and-white CCD camera with a light source, the image of the highway pavement is captured in real time, and the image is subjected to noise filtering, edge detection and image segmentation operations. Finally, the outline of the pavement crack can be clearly extracted, providing a basis for the subsequent calculation of parameters such as crack length, width and damage density.
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