Crack detection method with image gradient direction histogram and watershed method conflated

A detection method and gradient direction technology, which is applied in the field of non-destructive detection and evaluation of roadbed and pavement, can solve the problems of obtaining and crack depth information

Active Publication Date: 2014-08-27
WUHAN WUDA ZOYON SCI & TECH
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Problems solved by technology

However, fracture depth information is difficult to obtain from 2D images

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  • Crack detection method with image gradient direction histogram and watershed method conflated
  • Crack detection method with image gradient direction histogram and watershed method conflated
  • Crack detection method with image gradient direction histogram and watershed method conflated

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[0037] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and characteristics of the present invention will become clearer along with the description.

[0038] Those skilled in the art can understand that although the following description involves many technical details related to the embodiments of the present invention, this is only an example for illustrating the principle of the present invention, and does not imply any limitation. The present invention can be applied to occasions other than the technical details exemplified below, as long as they do not deviate from the principle and spirit of the present invention.

[0039] In addition, in order to avoid making the description in this manual limited to redundant, in the description in this manual, some technical details that can be obtained in the existing technical documents may be omitt...

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Abstract

The invention discloses a crack detection method with an image gradient direction histogram and watershed method conflated. The method includes the following steps that 1, the surface to be detected is illuminated by a light source of line structured light, light bar images of the surface to be measured is filmed through a 3D camera, the depth of each pixel point of the surface to be detected is obtained, the depth data are converted into grey level data, and a depth image of the surface to be detected is formed; 2, the gradients of the depth image in eight directions are worked out, and the gradient image of the surface to be detected is obtained; 3, the direction non-maximum suppression of the gradient image is worked out, and the edge image of the surface to be detected is obtained; 4, by adoption of watershed conversion, the connected domain of a crack is obtained, the boundaries of the connected domain are marked, and the closed boundaries of the crack are obtained.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection and evaluation of highway subgrade and pavement, and in particular relates to a crack detection method that combines a gradient direction histogram of a road surface depth image and a watershed method. Background technique [0002] Cracks are the most common disease on the pavement. It not only affects the appearance of the road and the comfort of driving. If it is not found and repaired in time, it is easy to expand and cause structural damage to the pavement, shortening the service life of the pavement. Pavement crack detection has become an important task in the daily maintenance and management of highways. Due to the huge workload, the traditional way of manually detecting pavement cracks cannot meet the requirements of the rapid growth of highways, and there is an urgent need for fast, efficient and reliable automatic crack detection technology and equipment. [0003] With ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T5/40
Inventor 李清泉毛庆洲靳华中曹民张德津陈振兴周瑾章丽萍
Owner WUHAN WUDA ZOYON SCI & TECH
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