| 影像增强器DR/CT系统像场畸变快速校正 |
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| 引用本文： | 杨民,何小意,魏东波,梁丽红.影像增强器DR/CT系统像场畸变快速校正[J].北京航空航天大学学报,2012,38(11):1440-1444. |
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| 作者姓名： | 杨民 何小意 魏东波 梁丽红 |
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| 作者单位： | 1. 北京航空航天大学 机械工程及自动化学院, 北京 100191;2. 中国特种设备检测研究院, 北京 100013 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 以XRS-152/153影像增强器DR/CT成像系统为研究对象,在分析其输出像场畸变特性的基础上,从校正精度和校正实时性要求出发,采用空间坐标多项式变换方法进行畸变校正.同时,为了解决畸变校正算法计算量大、运算速度慢的问题,利用可编程图形处理单元(GPU, Graphic Processing Unit)并行计算和高速浮点计算特性,将图像映射为GPU中的纹理,采用多线程并行计算,使得校正算法在GPU中加速执行.实验结果表明,本方法能有效实现畸变图像的校正,GPU加速方法可以在不损失图像信息的前提下,实现实时校正.
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| 关 键 词： | 射线数字成像 图像畸变 多项式拟合 可编程图形处理单元 影像增强器 |
| 收稿时间： | 2011-07-15 |
Image distortion fast correction for image intensifier DR/CT system |
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| Yang Min He Xiaoyi Wei DongboSchool of Mechanical Engineering and Automation,Beijing University of Aeronautics and Astronautics,Beijing,China Liang Lihong.Image distortion fast correction for image intensifier DR/CT system[J].Journal of Beijing University of Aeronautics and Astronautics,2012,38(11):1440-1444. |
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| Authors: | Yang Min He Xiaoyi Wei DongboSchool of Mechanical Engineering and Automation Beijing University of Aeronautics and Astronautics Beijing China Liang Lihong |
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| Institution: | 1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;2. China Special Equipment Inspection and Research Institute, Beijing 100013, China |
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| Abstract: | Starting from the distortion characteristics, correction precision and real time correction requirements for XRS-152/153 image intensifier DR/CT system, a cubic polynomial curve-fitting algorithm was proposed. Meanwhile, in order to solve its calculation complexity problem, graphic processing unit (GPU) was applied to make use of its high parallel and fast floating-point calculation abilities. In the implementation, the image was mapped to the GPU’s texture and multi-thread parallel calculation was adopted. The experimental results show that the correction algorithm could effectively restore the original information of the image. In addition, the acceleration with GPU could realize the real-time distortion correction without the loss of image information. |
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| Keywords: | digital radiography image distortion polynomial fitting graphic processing unit image in tensifier |
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