jgg     2013 33 (3):  64-67    ISSN: 0412-1961  CN: 21-1139/TG DETECTION OF EXCEPTIONAL CONJUGATE POINTS IN POINT  CLOUD REGISTRATION 1)School of Geodesy and Geomatics, Wuhan University, Wuhan 430079 2)Hazard Monitoring and Prevention Research Center, Wuhan University, Wuhan 430079 3)Institute of Surveying and Mapping, East China Institute of Technology, Fuzhou 344000 4)Jiangxi Electric Power Design Institute, Nanchang 330000 Received: 2012-12-09  Revised: null  Online: 2013-06-18 Supporting info