Research on Rapid Acquisition Image System for the Cracks of High-speed Railway Tunnel Lining
|School||Southwest Jiaotong University|
|Course||Bridge and Tunnel Engineering|
|Keywords||Lining cracks Image Acquisition Crack Automatic Detecting DigitalImage Processing Crack Characteristics Indicators|
In the current period, a large amount of high-speed railway is in construction and operating in our country. By the requirement of smoothness, high-speed railway using a large number of bridges and tunnels. For a long time in the future, our country will be faced with the status that a large number of tunnels need regular maintenance. Due to the characteristics of the high-speed railway tunnel, detecting work that only rely on artificial detection or manual detection equipment cannot meet the requirements. Based on the above background, this thesis studies the automatic detection system for cracks in high-speed railway tunnel lining which using the image acquisition and processing technology.In this thesis, the principle of automatic detection system for cracks in high-speed railway tunnel lining was deeply researched. And this thesis has gives the overall design of the system, including image acquisition subsystem and image processing subsystem. Appropriate indexes of lining crack evaluation was selected for automatic detection system.According to the characteristics of image acquisition system for tunnel lining, this thesis selected the hardware for image acquisition system which make the image acquisition system can meet the detection requirements. And the acquisition scheme of image acquisition system is designed.In the light of the crack image, suitable methods were selected for the enhancement and segmentation of cracks image through experiments, and mathematical morphology method was used for the crack image after segmentation. These steps lay the foundation for subsequent image analysis.By reading the digital image, the characteristic indexes of crack were extracted, and using the geometric features to discriminate between cracks and other distractors in the images.In this thesis, a set of image acquisition system for cracks in high-speed railway tunnel lining was built.and the crack images were analysed with image processing technology. The system provide a reliable way for the detection of high-speed railway tunnel lining. The system has important significance to ensure the safe operation of high-speed railway.