| 面向医学超声图像坐标变换的CORDIC算法优化 |
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| 引用本文： | 郁道银,李妍,李明,汪毅,陈晓冬. 面向医学超声图像坐标变换的CORDIC算法优化[J]. 纳米技术与精密工程, 2011, 9(6): 504-508 |
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| 作者姓名： | 郁道银 李妍 李明 汪毅 陈晓冬 |
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| 作者单位： | 天津大学精密仪器与光电子工程学院,天津 300072;天津大学光电信息技术教育部重点实验室,天津 300072 |
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| 基金项目： | 国家自然科学基金资助项目(60827005); 国家高技术研究发展计划(863计划)资助项目(2007AA04Z339) |
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| 摘 要： | 本文提出一种用于医学超声内窥成像坐标变换的改进坐标标定的CORDIC(MCC-CORDIC)算法.在传统CORDIC算法的基础上,重新标定直角坐标,同时通过简单的数学转换将坐标位置映射到第1象限后进行坐标变换,减少FPGA资源使用量的同时解决了算法在[0,360°]范围内收敛角度范围不足的问题;通过对数据位宽、模校正方法的优化,提高了算法的精度;基于流水线结构的硬件实现使算法满足超声实时成像的要求.经仿真与超声实时成像实验验证,极角误差由0.006 3 rad减小到0.000 5 rad,极径误差由0.082减小到0.03.
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| 关 键 词： | 医学超声图像 坐标标定 改进的坐标标定的CORDIC算法 坐标变换 流水线结构 |
Optimized Design of CORDIC Algorithm for Coordinate Conversion of Medical Ultrasonic Image |
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| YU Dao-yin,LI Yan,LI Ming,WANG Yi,CHEN Xiao-dong. Optimized Design of CORDIC Algorithm for Coordinate Conversion of Medical Ultrasonic Image[J]. Nanotechnology and Precision Engineering, 2011, 9(6): 504-508 |
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| Authors: | YU Dao-yin LI Yan LI Ming WANG Yi CHEN Xiao-dong |
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| Affiliation: | YU Dao-yin1,2,LI Yan1,LI Ming1,WANG Yi1,CHEN Xiao-dong1,2(1.School of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China,2.Key Laboratory of Opto-Electronics Information Technology of Ministry of Education,China) |
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| Abstract: | The modified coordinate calibration coordinate rotation digital computer(MCC-CORDIC) algorithm for coordinate conversion was introduced into medical ultrasonic endoscopic imaging system in this paper.Based on the conventional CORDIC algorithm,the Cartesian coordinates were re-calibrated to save logic element resources of FPGA.Before coordinate conversion was started,each Cartesian coordinate was mapped onto the first quadrant by a simple mathematical transformation.As a result,the problem that the convergen... |
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| Keywords: | medical ultrasonic image coordinate calibration modified coordinate calibration CORDIC algorithm coordinate conversion pipeline structure |
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