| 基于校正靶特征与Biharmonic样条插值的XRII图像扭曲校正 |
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| 引用本文： | 李元金,罗立民,张鹏程,张权,杨春山.基于校正靶特征与Biharmonic样条插值的XRII图像扭曲校正[J].东南大学学报(自然科学版),2011,41(6):1213-1218. |
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| 作者姓名： | 李元金 罗立民 张鹏程 张权 杨春山 |
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| 作者单位： | 1. 东南大学影像与科学技术实验室,南京210096;滁州学院计算机科学与技术系,滁州239000
2. 东南大学影像与科学技术实验室,南京,210096 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)资助项目，江苏省创新学者攀登资助项目，应用教学省级本科教学团队建设资助项目(滁州学院) |
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| 摘 要： | 针对扭曲的XRII图像给C臂X光机成像系统实时标定带来不利影响的问题,提出了基于校正靶特征和Biharmonic样条曲面插值相结合的XRII图像扭曲校正方法.在分析校正靶自身特征的基础上,使用Otsu算法与形态学相结合的方法提取了校正靶网格线交叉点坐标,然后拟合提取出的网格线交叉点坐标,最后使用Biharmonic样条...
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| 关 键 词： | 校正靶特征 Biharmonic样条 XRⅡ图像 扭曲校正 |
Distortion correction of XRII image based on calibration grid characteristic and Biharmonic interpolation |
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| Li Yuanjin,Luo Limin,Zhang Pengcheng,Zhang Quan,Yang Chunshan.Distortion correction of XRII image based on calibration grid characteristic and Biharmonic interpolation[J].Journal of Southeast University(Natural Science Edition),2011,41(6):1213-1218. |
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| Authors: | Li Yuanjin Luo Limin Zhang Pengcheng Zhang Quan Yang Chunshan |
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| Institution: | 1(1Laboratory of Image Science and Technology,Southeast University,Nanjing 210096,China)(2Department of Computer,Chuzhou University,Chuzhou 239000,China) |
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| Abstract: | To solve the problem that distortional XRⅡ(X-ray image intensifier) image brings about adverse effect on real time calibration for C-arm CT(computer tomography) imaging system,a distortion correction method for XRII image based on calibration grid characteristic and Biharmonic spline surface interpolation is proposed.After analysing calibration grid characteristic,a connection method of Otsu algorithm and morphology is proposed to extract the coordinates of intersect marker on calibration grid.Then the extracted coordinates are used to fit a surface.Finally,Biharmonic spline surface interpolation are used to correct the distorted XRII image.Experiment demonstrates that the residual error and the standard error between the extracted intersect marker coordinates on calibration grid using Otsu algorithm and morphology and the intersect marker coordinates on calibration grid of ideal image are 10.489 0±0.074 0 and 4.263 2±0.015 0,respectively.However,after using Biharmonic spline surface interpolation,the residual error and the standard error are respectively reduced to(7.121 85±3.354 15)×10-13 and(3.915 1±1.862 7)×10-13. |
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| Keywords: | calibration grid characteristic Biharmonic spline XRⅡ(X-ray image intensifier) image distortion correction |
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