The problem of structure from motion is concerned with recovering the 3-dimensional structure of an object from a set of 2-dimensional images. Generally, all information can be uniquely recovered if enough images and image points are provided, yet there are certain cases where unique recovery is impossible; these are called critical configurations. In this paper we use an algebraic approach to study the critical configurations for three projective cameras. We show that all critical configurations lie on the intersection of quadric surfaces, and classify exactly which intersections constitute a critical configuration.
翻译:运动的结构问题涉及从一组二维图像中恢复一个对象的三维结构。 一般而言,如果提供了足够的图像和图像点,所有信息都可以被独一地恢复,但有些情况下无法实现独特的恢复;这些是关键配置。在本文件中,我们使用代数法来研究三个投影相机的关键配置。我们显示,所有关键配置都位于四维表面的交叉处,并精确地区分哪些交叉构成关键配置。