【摘要】 文中提出的测量系统包括自动定点和人工交互式定点两部分。人工定点部分是一种基于小波多尺度分析的特征点自动提取方法。在不同分辨率的图像上 ,用Canny最佳滤波器 ,基于知识的跟踪、可变形模板等方法 ,得到高精度的轮廓线 ;然后根据特征点的几何定义 ,利用轮廓线的位置、曲率等信息自动提取特征点。对于图像质量差、自动定点无法完成或者精度不高的情况 ,可由人工交互式定点进行补充 ,从而形成一个完整的X线投影测量系统。更多还原

【Abstract】 The X-ray skull image measuring system proposed in this paper is composed by two parts: automatic landmarking and interactive landmarking. A wavelet-based method is presented to automatically extract characteristic points of human skull in the automatic landmarking part. On the images of different scale, Canny filter, knowledge-based tracking method and knowledge-based deformable template are used to get accurate and consistent contours. Characteri stic points can be extracted by considering the geometry definition, the position and curvature of each point on the contours. On the low quality images, if the automatic landmarking can not get the accurate characteristic points, the interactive landmarking procedure is used to finish that job, and forms a integrate X-ray skull image measuring system.更多还原