[1] SHOLL H, AMMAR R, GREENSHIELDS I, et al. Application of computing analysis to real-time railroad track inspection[C]//Automation Congress. New York, USA:IEEE,2006:1-6.
[2] HUANG J X. The application study of image processing in track detection[D]. Beijing: Beijing Jiaotong University, 2007:33-83(in Chinese).
[3] LIU T, REN S W, XU G Y, et al. Upgrading of gauge-alignment system of type GJ-4 track inspection car[J]. China Railway Science, 2006, 32(6):137-140(in Chinese).
[4] RESENDIZ E, HART J M, AHUJA N. Automated visual inspection of railroad track[J].Intelligent Transportation Systems, 2013, 14(2):751-760.
[5] RIZZO P, CAMMARATA M, BARTOLI I. Ultrasonic guided waves-based monitoring of rail head laboratory and field tests[J]. Advances in Civil Engineering, 2010, 6(10):1-13.
[6] HU K, ZHOU F Q, ZHANG G J. An rapid sub-pixel accuracy extraction method for structured light stripe center[J]. Chinese Journal of Science Instrument, 2006, 27(10):1326-1329(in Chinese).
[7] LEI H J, LI D H, WANG J Y, et al. An rapid detection method structured light stripe center[J]. Huazhong University of Science and Technology (Natural Science Edition), 2003, 31(1):74-76(in Chinese).
[8] LI Z W, WANG C J, SHI Y S. An extraction algorithm for combination of gradient sharpening and optical center of gravity method[J]. Chinese Journal of Image and Graphics, 2008, 13(1): 64-68(in Chinese).
[9] LI M, FENG H J, XU Z H, et al. A corrected image contour extraction method using intensity information for structured light[J]. Optical Engineering, 2005, 32(2):30-32(in Chinese).
[10] ZHAN L, YU L, XIAO J, et al. Calibration method research of laser camera sensor in track detection[J]. Journal of Mechanical Engineering, 2013, 49(16):39-47(in Chinese).
[11] MI C Z, XIE Z J, CHEN T, et al. The key technology of image enhancement and edge extraction of heavy rail[J]. Optics and Precision Engineering, 2012, 20(7):1645-1652(in Chinese).
[12] OUYANG Ch S, YUAN J, TIAN J W, et al. An enhancement method for X-ray image using rough sets and human visual system [J]. Journal of Xi'an Jiaotong University, 2009, 43(6): 48-51(in Chinese).
[13] SONKA M, HLAVAC V, BOYLE R. Image processing analysis and machine vision[M].3rd ed. Beijing: Tsinghua University Press, 2007:1-613(in Chinese).
[14] ZHAO B H, WANG B X, ZHANG J, et al. Center extraction method for rough metal surface light strip[J]. Optics and Precision Engineering, 2011, 19(9):2138-2145(in Chinese).
[15] ZHAO J, ZHAO J, ZHANG L. Image processing and feature extraction for structured light images of welded seam [J]. Journal of Xi'an Jiaotong University, 2013, 47(1):114-119(in Chinese).
[16] WANG M J, YANG L, WANG X, et al.The class euclidean distance transformation class features extraction with a simplified pulse coupled neural network traffic sign image[J]. Optics and Precision Engineering, 2012, 20(12):2751-2758(in Chinese).
[17] SAPIRO G. Geometric partial differential equations and image analysis[M].3rd ed. London,UK: Cambridge University Press, 2006:1-532.