摘要(英) |
The elements of concrete structures suffering from chemical reactions tend to be an expansion phenomenon, which leads to cracks. Non-contact measurement is employed to analysis the relationship between concrete expansion and crack width. This paper deals with semi-automatic crack feature extraction from digital multi-temporal close-range images with non-metric camera and processes the image adjustment with lens distortion parameters. Furthermore, the relationship between image and object space is obtained by 2-D projective transformation to do tilt rectification. Only few roughly manual seed points are required on crotches of crack features. Then, the shape and position may be illustrated with automatic feature extraction in two-dimensional image space. Because manual seed points are not exactly located on the crack features, two methods are proposed to search the geometric crack features, such as crotches. Wavelet transformation, clumpping, thinning and crossing algorithm are processed sequentialy to reach the automatic feature extraciton purpose. Depending on these seed points, crack tracks and edges are determined by the method in this paper. Local image registration is utilized to raise relative accuracy and acquire the expansion of concrete cracks. |
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