On Digital Identification of Water Leakage at Tunnel Lining Based on the Panoramic Developed Image

Based on the images acquisited in the water leakage area of tunnel lining, the panoramic developed im? age of tunnel lining was obtained by using a image generator software in which the procedures of image feature extraction, image matching, model identification, image spread and mosaic processing can be performed. With techniques of image segmentation and processing, the information identification and correction of water leakage area were realized by means of grayscale image conversion, threshold selection and open-close operation of binary image. On the basis of water leakage at lining of an operated road tunnel in Guizhou, the location, area, length of water leakage and so on were deduced by several algorithmic programs, and a digital identification system of water leakage at tunnel lining was established, providing a convenient, efficient and comprehensive testing method for water leakage of tunnel lining.