中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (39): 7230-7233.doi: 10.3969/j.issn.1673-8225.2011.39.003

• 数字化骨科 digital orthopedics • 上一篇    下一篇

计算机辅助手术导航中持针器标志球的立体匹配

张瑞娟,武雪梅,刘  奇   

  1. 四川大学电气信息学院,四川省成都市  610065
  • 收稿日期:2011-04-17 修回日期:2011-08-29 出版日期:2011-09-24
  • 通讯作者: 刘奇,博士,副教授,硕士生导师,四川大学电气信息学院,四川省成都市 610065 liuqi@scu.edu.cn
  • 作者简介:张瑞娟★,女,1987年生,河南省滑县人,汉族,四川大学在读硕士,主要从事医学图像和信号处理的研究。 zhrj1025@163.com

Needle-holder markers detection based on an improved Hough Transform

Zhang Rui-juan, Wu Xue-mei, Liu Qi   

  1. Electrical Information College, Sichuan University, Chengdu  610065, Sichuan Province, China
  • Received:2011-04-17 Revised:2011-08-29 Online:2011-09-24
  • Contact: Liu Qi, Doctor, Associate professor, Master’s supervisor, Electrical Information College, Sichuan University, Chengdu 610065, Sichuan Province, China liuqi@scu.edu.cn
  • About author:Zhang Rui-juan★, Studying for master’s degree, Electrical Information College, Sichuan University, Chengdu 610065, Sichuan Province, China zhrj1025@163.com

摘要:

背景:由于噪声、光照变化、遮挡和透视畸变等因素的影响,造成被动式光学定位方法中立体匹配的实现成难点。
目的:用改进的圆Hough变换快速、准确的检测出持针器标志球的两图像平面坐标,简化立体匹配过程。
方法:利用改进的圆Hough变换检测持针器的立体像对,检测出持针器的标志球在两图像平面上的坐标,利用几何知识对持针器的标志球编号。
结果与结论:结果表明,改进的圆hough变换可以快速、准确地测出持针器标志球的图像坐标,通过对持针器的标志球编号可以取代被动式光学定位中立体匹配的环节。

关键词: 持针器, 双目立体视觉测量, 计算机辅助外科手术, 圆Hough变换, 数字化医学

Abstract:

BACKGROUND: Stereo-match is the nodus of passive-optical-localization, because the images usually are influenced by noise, illumination change, shielding, perspective, distortion and so on.
OBJECTIVE: To simplify the stereo-match algorithm, we derived the markers of the needle-holder’s balls by using an improved Hough Transform of circle detection.
METHODS: The improved Hough Transform of circle detection was used to detect the stereograph. We could gain the markers of the needle-holder’s balls. And then we used the knowledge of geometry to mark the needle-holder’s balls.
RESULTS AND CONCLUSION: Results showed that that this improved Hough Transform was fast enough, stable and accurate when we used it to derive the markers of the needle-holder’s balls. We could use the method to substitute stereo-match in passive optical localization, which could lay the foundation of stereotaxy.

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