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基于投影约束的C臂外参数优化方法

王田苗 栾胜 胡磊

王田苗, 栾胜, 胡磊等 . 基于投影约束的C臂外参数优化方法[J]. 北京航空航天大学学报, 2008, 34(7): 747-750.
引用本文: 王田苗, 栾胜, 胡磊等 . 基于投影约束的C臂外参数优化方法[J]. 北京航空航天大学学报, 2008, 34(7): 747-750.
Wang Tianmiao, Luan Sheng, Hu Leiet al. Reproject and correct optimization in determining C-arm extrinsic parameters based on geometry constraints[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(7): 747-750. (in Chinese)
Citation: Wang Tianmiao, Luan Sheng, Hu Leiet al. Reproject and correct optimization in determining C-arm extrinsic parameters based on geometry constraints[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(7): 747-750. (in Chinese)

基于投影约束的C臂外参数优化方法

基金项目: 国家杰出青年科学基金资助项目( 60525314 ); 国家科技支撑计划资助项目(2006BAI03A16); 北京市科技计划资助项目(H060720050230)
详细信息
    作者简介:

    王田苗(1960-),男,湖北武汉人,教授,wtm_itm@263.net.

  • 中图分类号: TP 391

Reproject and correct optimization in determining C-arm extrinsic parameters based on geometry constraints

  • 摘要: C臂外参数计算是手术导航系统实现图像空间与手术空间映射的关键环节.标记点提取误差将使外参数偏离真值.采用投影方法系统分析选点误差对外参数计算的影响,发现相机光轴方向平移参数收敛性弱、易受误差干扰.利用不同平面上投影距离之比作为约束对线性方法所得外参数进行修正.借鉴二/三维图像配准方法,采用修正后的估计外参数与已标定内参数进行重投影,根据几何方法直接求出外参数修正量,避免反复迭代优化.仿真结果表明,该标定方法对误差具有一定免疫性,能够提高外参数精度.

     

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出版历程
  • 收稿日期:  2007-06-20
  • 网络出版日期:  2008-07-31

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