1Kasban H, Zahran 0,Arafa H, et al. Welding defectdetection from radiography images with a cepstral ap-proach [J]. NDT and E International, 2011, 44(2):226-231.
2Sonka M, Hlavac V,Boyle R. Image processing,analysis and machine vision ( secondedition) [ M ].USA: Brooks/Cole, Thomson Ltd, 2001.
3Harris C, Stephens M. A combined corner and edgedetector [C]// Processing of the Fourth Alvey VisionConference. Manchester, UK: Plessey Research RokeManor, 1988: 147-151.