Method for tracking camera motion of real endoscope by using virtual endoscopy system
Method for tracking camera motion of real endoscope by using virtual endoscopy system
复制标题
利用虚拟内窥镜系统跟踪真实内窥镜摄像机运动的方法
DOI：
10.1117/12.383391
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
H. Natori
中科院分区：
文献类型：
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作者：
K. Mori;Y. Suenaga;J. Toriwaki;J. Hasegawa;K. Katada;H. Takabatake;H. Natori
提出了一种利用虚拟内窥镜系统跟踪真实的内窥镜摄像机运动的方法。虚拟内窥镜最重要的优点之一是虚拟内窥镜可以可视化存在于目标器官壁下的其他器官的信息。如果能够在患者的检查中跟踪真实的内窥镜（纤维镜）的视点和观察方向，并且将通过虚拟内窥镜获得的各种信息显示到真实的内窥镜图像上，则我们构建了用于辅助检查的非常有用的系统。当输入一系列真实的内窥镜图像时，通过搜索对应于真实的内窥镜的摄像机运动的虚拟内窥镜的一系列视点和观察方向来执行跟踪。首先，我们粗略地指定对应于真实的内窥镜图像的第一帧的初始视点和视图方向。该方法通过计算在限定的搜索区域内生成的虚拟内窥镜图像和真实的内窥镜图像之间的匹配率来搜索最佳视点和视角方向。摄像机运动也估计通过分析视频图像直接。我们已经将所提出的方法应用到视频图像的真实的支气管镜和X射线CT图像。实验结果表明，该方法能够跟踪真实的内窥镜的摄像机运动。
This paper proposes a method for tracking the camera motion of the real endoscope by using the virtual endoscopy system. One of the most important advantages of the virtual endoscopy is that the virtual endoscopy can visualize information of other organs that are existing under the wall of the target organ. If it is possible to track the viewpoint and the view direction of real endoscopy (fiberscope) in the examination of the patient and to display various information obtained by the virtual endoscopy onto the real endoscopic image, we construct a very useful system for assisting examination. When a sequence of real endoscopic images is inputted, tracking is performed by searching a sequence of viewpoints and view directions of virtual endoscope that correspond to camera motions of the real endoscope. First we roughly specify initial viewpoints and view directions that correspond to the first frame of the real endoscopic image. The method searches the best viewpoint and view direction by calculating matching ratio between a generated virtual endoscopic image and a real endoscopic image within the defined search area. Camera motion is also estimated by analyzing video images directly. We have applied the proposed method to video images of real bronchoscopy and X-ray CT images. The result showed that the method could track the camera motion of real endoscope.