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| 引用本文： | 许正文,姚连璧.?????????????????С??????????[J].大地测量与地球动力学,2008,28(1):77-80. |
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| 作者姓名： | 许正文 姚连璧 |
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| 作者单位： | 1. 同济大学测量与国土信息工程系,上海,200092
2. 同济大学测量与国土信息工程系,上海,200092;现代工程测量国家测绘局重点实验室,上海,200092 |
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| 基金项目： | 建设部专项项目(20060909) |
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| 摘 要： | ?????????????????????????????????????????????????????????????????????????伸?β????????????????????????????????????????????????????????????????????????С????????????,??Matlab?????????????????????????????????????????????????????????????????????????????Ч???á???????
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| 关 键 词： | ??????? ?????С???? ?????? ???μ?? ??????? |
| 文章编号： | 1671-5942（2008）01-0077-04 |
| 收稿时间： | 2007-07-31 |
| 修稿时间： | 2007年7月31日 |
DIRECT LEAST SQUARE ROBUST ESTIMATION METHOD FOR ELLIPSE FITTING |
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| Xu Zlaengwen,Yao Lianbi.DIRECT LEAST SQUARE ROBUST ESTIMATION METHOD FOR ELLIPSE FITTING[J].Journal of Geodesy and Geodynamics,2008,28(1):77-80. |
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| Authors: | Xu Zlaengwen Yao Lianbi |
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| Institution: | 1)Department of Surveying and Geo-Informatics, Tongji University, Shanghai 2000922)Key Laboratory of Advanced Surveying Engineering of SBSM,Shanghai 200092 |
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| Abstract: | Tunnel cross section deformation ellipse reflects the deformation of tunnel segment under external load. The spatial geometry parameters of the deformation ellipse can be calculated through accurate spatial ellipse fitting. The algorithm for direct least square ellipse fitting based on robust estimation is introduced, which integrates the gross error detecting by robust estimation and conic parameter constraint of ellipse. The algorithm is implemented in a Matlab program, and is validated by a set of real surveying data of Shanghai Yangtze River Tunnel. The fitting result shows that the algorithm increases the accuracy and the efficiency in gross error detecting. |
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| Keywords: | robust estimation direct least square ellipse fitting deformation detection tunnel profile |
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