Metz C E, Fencil L E
Kurt Rossmann Laboratories for Radiologic Image Research, Department of Radiology, University of Chicago, Illinois 60637.
Med Phys. 1989 Jan-Feb;16(1):45-51. doi: 10.1118/1.596401.
A novel method allows the determination of three-dimensional object structure from two projection images that are obtained at arbitrary, unknown orientations. Only minimal prior information concerning the imaging system is required. First, the image coordinates of eight or more object points that can be identified unambiguously in both views are used to determine the relative geometry of the two projections. Subsequently, the three-dimensional coordinates of the identified object points are determined, to within a scale factor, from the image coordinates of the points and the calculated imaging system geometry. A theoretical description of the overall method is provided, along with techniques for the reduction of effects of experimental errors and numerical errors that may arise in the course of the calculations. Methods to retrieve the absolute scale of the object are discussed also.
一种新方法能够从以任意未知方向获取的两幅投影图像确定三维物体结构。仅需关于成像系统的最少先验信息。首先，使用在两个视图中都能明确识别的八个或更多物体点的图像坐标来确定两个投影的相对几何关系。随后，根据这些点的图像坐标和计算出的成像系统几何关系，在比例因子范围内确定已识别物体点的三维坐标。给出了该整体方法的理论描述，以及减少计算过程中可能出现的实验误差和数值误差影响的技术。还讨论了获取物体绝对比例的方法。
