|本期目录/Table of Contents|

一种显微CT系统图像畸变校正方法(PDF)

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2017年6期
页码:
449-454
栏目:
出版日期:
2017-11-15

文章信息/Info

Title:
A Method of Image Distortion Correction in Micro-CT System
文章编号:
1672-6030(2017)06-0449-06
作者:
邹晶 徐晓茹 胡晓东 赵金涛
精密测试技术及仪器国家重点实验室(天津大学),天津300072
Author(s):
Zou Jing Xu Xiaoru Hu Xiaodong Zhao Jintao
State Key Laboratory of Precision Measuring Technology and Instruments (Tianjin University), Tianjin 300072, China
关键词:
显微CT 图像畸变校正 空间分辨力
Keywords:
micro-CT image distortion correction spatial resolution
分类号:
TP391.41
DOI:
10.13494/j.npe.20160107
文献标识码:
A
摘要:
基于透镜耦合的光耦探测器由于其高分辨力、倍率选择多样化的特点,被应用到显微CT系统中.然而,光耦探测器的成像畸变影响了显微CT系统的成像质量.为此提出一种适用于显微CT系统的图像畸变校正方法.建立理想图像和实际畸变图像的多项式函数关系,利用特征点坐标求取畸变系数,并利用畸变系数对图像进行畸变校正.实验结果表明,所提方法能够有效地校正畸变,校正后系统的空间分辨力由原来的8.5 μm提升到4.2 μm.标准网格板图像校正后网格线的弯曲得到明显改善,网格间距趋于平均,离散程度变小.同时,该畸变校正算法复杂度低,具有较高的实用性.
Abstract:
Lens-coupled X-ray detectors have been applied in X-ray micro-CT system for its high resolution and flexible magnification choice. However, imaging distortion of lens-coupled detector may degrade the imaging quality of micro-CT system. To reduce the image distortion, a correction method is proposed. The polynomial function relationship between the ideal image and the real distortion image is established, and the distortion coefficient is calculated by the coordinates of feature points. Then the distortion image can be corrected by using the distortion coefficient. Experimental results show that the proposed method can effectively correct the image distortion. The spatial resolution of the system is enhanced from 8.5 μm to 4.2 μm. The bending of standard grid is smaller and the grid spacing tends to be more equal with a smaller discrete degree after distortion correction. At the same time, the distortion correction algorithm has low complexity and high practicability.

参考文献/References

备注/Memo

备注/Memo:
收稿日期: 2017-01-08. 基金项目: 国家自然科学基金资助项目(61372144);国家重大科学仪器开发专项资助项目(2011YQ030112). 作者简介: 邹晶(1980—),女,博士,副研究员. 通讯作者: 邹晶,jingzoutd@tju.edu.cn.
更新日期/Last Update: 2017-12-21