1. Analysis of edge-detection techniques for crack identification in bridges;Abdel-Qader;J. Comput. Civil Eng.,2003
2. PCA-based algorithm for unsupervised bridge crack detection;Abdel-Qader;Adv. Eng. Softw.,2006
3. Acharjya, P.P., Das, R., Ghoshal, D., 2012. Study and comparison of different edge detectors for image segmentation. Global Journal of Computer Science and Technology.
4. Tunnel inspection using photogrammetric techniques and image processing: A review;Attard;ISPRS J. Photogramm. Remote Sens.,2018
5. Image Filtering Algorithms for Tunnel Lining Surface Cracks Based on Adaptive Median-Gaussian, ICTE 2019;Ba,2020