[3] Chin E lin, Ann-San Hou.Real-time position and attitude sensing using CCD cameras in magnetic suspension system applications[J].IEEE Transactions on Instrumentation and Measurement(S0018-9456), 1995, 44(1): 8-13.
[5] Nigbor R L.Six-degree-of-freedom ground-motion measurement[J].Bulletin of the Seismological Society of America(S0037-1106), 1994, 84(5): 1665-1669.
[7] TBM Guidance System SLS-T Manual[K].VMT GmbH, 2002: 5-7.
[12] GAO Wenshou, ZHANG Xiaoguang, YANG Lei, et al.An improved Sobel edge detection[C]// 3rd IEEE International Conference on Computer Science and Information Technology(ICCSIT), Chengdu, China, July 9-11, 2010, 5: 67-71.