High speed railway track surface defect coupling method based on machine visual inspection
A technology of machine vision inspection and high-speed railway, which is applied in the direction of optical testing for flaws/defects, and can solve problems such as inability to identify and eliminate rail information
Active Publication Date: 2014-07-09
HUNAN UNIV
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[0004] To sum up, in the existing machine vision inspection system, it is impossible to identify and remove redundant rail information, and a matching method for machine vision defect detection on the surface of high-speed rail is urgently needed in order to remove redundant information
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Embodiment 1
[0069] Such as figure 1 Shown is a flow chart of a method for matching surface defects of high-speed railway tracks based on machine vision detection in the present invention, and the specific steps are as follows:
[0070] Step 1: Obtain the rail panorama image f(x,y);
[0071] The line scan camera is mounted on the train, and the encoder on the wheel is used to control the camera to collect images, so that the trigger frequency of the camera matches the speed of the train, ensuring that the stitched rail panorama image contains complete rail surface defect information.
[0072] Such as figure 2 As shown, two rail images of the same rail defect were taken at different times, where (a) is the stored rail image, and (b) is the real-time collected rail image;
[0073] Step 2: Use the vertical projection method to extract the rail surface area image f from the rail panorama image 1 (x,y);
[0074] (1 pair figure 2 The middle image (a) accumulates the gray value column by c...
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The invention discloses a high speed railway track surface defect coupling method based on machine visual inspection, which comprises the following steps: 1) obtaining a rail panoramic image f(x,y); 2)employing a vertical projection method for extracting a rail surface area image f1(x,y) in the rail panoramic image; 3)performing median filter treatment on the rail surface area image to obtain a rail surface area image f2(x,y) through noise removal; 4)performing image preprocessing on the rail surface area image; 5)extracting the defect characteristic information in an image f4(x,y); 6)respectively obtaining the defect characteristic information in a history acquisition image and the defect characteristic information in a real-time acquisition image; and 7)coupling the characteristic information capable of performing real-time defect acquisition with all the characteristic information with stored defect in order and calculating to obtain the coupled defect characteristic information. The method realizes the high speed and high precision coupling for the rail surface defect.
Description
technical field [0001] The invention belongs to the technical field of machine vision detection, in particular to a method for matching surface defects of high-speed railway tracks based on machine vision detection. Background technique [0002] In my country's transportation industry, railways play a huge role. With the continuous development of modern rail technology, the service life of rails is getting longer and longer. However, due to the huge railway network in our country, the service life of rails is uncertain and cannot be maintained and replaced uniformly. When the train runs on the defective rails, it is very easy to damage the train, and serious train accidents will also be caused. In order to ensure the safety and continuity of railway transportation, it is necessary to conduct regular inspections on the rails, and to maintain and replace damaged rails. In the case of a large increase in train speed and heavy-duty trains running, it is necessary to know the q...
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IPC IPC(8): G01N21/88
Inventor 王耀南尹逊帅贺振东冯明涛吴成中陈铁建周显恩
Owner HUNAN UNIV