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Automatic visual inspection of cracks on concrete surface has become increasingly important for the health diagnosis of subway tunnel structures to prevent catastrophic failures. This paper designs an on‐board image acquisition system using multiple line scan cameras to capture the full‐section images of tunnel surface and proposes a robust automatic crack detection method for noisy and complicated...
Railway clearance detection system based on rotating laser scanner sensors was designed for the realization of non-contact detection of railway clearance. In the system, in order to acquire and synchronize the data of Laser scanner sensors, gyroscope, position transducers and speed sensor, the FPGA-based PCI data acquisition synchronization card was designed. This paper describes the hardware design...
On account of the difficulty in measuring the true rail thermal stress, a new method is proposed to rapidly evaluate rail thermal stress based on the dynamic responses of vehicle-track coupling system. A vertical slab-track model with the rail longitudinal thermal stress is established. The natural vibration characteristic of the track under the influences of the rail longitudinal stress distribution...
An image mosaic method focusing on images with large perspective distortion is proposed. Correction of perspective distortion based on perspective transformation model is applied first in this method to reduce the inconvenience of the distortion. To the corrected images, feature extraction, feature matching relied on the features in the overlapped area, and weighted fusion are applied to obtain a...
It has an important meaning of high-speed railway's safety to set up the intrusion clearance detection system besides the railway lines. This paper comes up with a method to detect high-speed railway's intrusion based on binocular stereo vision. The overall structure, the camera calibration and the algorithm of intrusion clearance detection have been specifically introduced in this paper. The SAD...
Regular measurement of tunnel complete profile is important to the train operation safety. An onboard tunnel clearance measurement device is designed by integrating photogrammetry with linear laser scanning in this paper. The main principle of design is based on the triangulation method using lasers and cameras. Multiple high speed industrial cameras are used to shoot the laser strip profile with...
In this paper, an automatic detection system of fence completeness for high-speed railway was proposed. This system uses two cameras installed on CIT (Composited Inspection Train) to shoot the fence on each side individually, and then transmit the images by optic fiber to a computer, which processes the images and recognizes the completeness of the fence automatically. The system will recode any loss...
A new method for instantaneous position and pose measurements of fast-moving railway vehicles is proposed to solve the measurement reference problem encountered in applications of kinematical examination on the safety status of railway infrastructures. By utilizing reflection mirror sets installed on the ground, onboard lasers, and onboard imaging and monitoring equipments, this method can measure...
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