基于几何特征的X射线图像中圆形标志点自动提取

Automatic Circular Marker Detection for X-ray Images Base on Geometric Parameter

从X射线图像中快速准确地提取圆形标志点是基于C形臂的手术导航中进行跟踪的关键环节。由于在实际应用中X射线图像的标记点半径较小,并且有其他的背景噪声和干扰物,使得一些传统的圆形检测方法往往鲁棒性不够高。针对这一问题,本文提出了一种基于几何特征的圆形目标检测方法,利用这种方法能够对X射线图像中的圆形标记点进行自动提取。实验测试表明该方法能够有效地检测不同半径的圆,并且能够通过调节参数检测到不标准的圆形。实验结果显示该方法在对C形臂X射线成像中的圆形标志物的自动提取具有较高的效率及鲁棒性。

Automatic detection of markers for fluoroscopic images is the key for fluoroscopy-based navigation system.Due to the small radius of markers and background noises,the robust and the precision of traditional circle detection algorithms are not satisfied.In order to solve this problem,ageometric-parameter-based algorithm,which can extract markers automatically from X-ray images,is proposed.The method can detect the circles of different radius in fluoroscopic images and non-standard circles by adjusting the parameter.The experimental results show that the proposed algorithm holds high efficiency and robustness.