Research on Rapid Detection Technology Based on Infrared Image and Calibration Method of Tunnel Cracks

Because of the advantages of fast detection speed and no need for traffic control, the rapid detection vehicle based on camera technology is more suitable for the detection of apparent diseases in high-grade highway tunnels. However, this type of rapid detection vehicle basically uses visible light illumination, which has defects such as interfering with the normal driving of other vehicles in the tunnel. Therefore, a rapid detection vehicle for tunnel cracks using infrared supplementary light and its tunnel crack measurement technology based on digital images are introduced. Furthermore, in order to ensure the accuracy of crack detection of fast detection vehicle, it is necessary to calibrate the accuracy. In this paper, a new calibration method is proposed for the shortcomings of the existing calibration methods crack of detection accuracy. As an example, the rapid tunnel inspection vehicle based on the infrared band imaging technology is calibrated and compared with the other tunnel rapid inspection vehicles using visible light illumination. It is found that the calibration method is suitable for the calibration of the crack detection accuracy of tunnel rapid inspection vehicles with infrared or visible light illuminated. It also has the advantages of conforming to the actual environment of the operating tunnel, not affecting the traffic operation, small image processing workload, high accuracy, repeatable calibration, etc., and is further verified and reliable by the operating road tunnel, which meets the requirements of the relevant specifications for the accuracy of crack detection.