Abstract

Given two arbitrary views of a scene under central projection, if the motion of points on a parametric surface is compensated, the residual parallax displacement field on the reference image is an epipolar field. If the surface aligned is a plane, the parallax magnitude at an image point is directly proportional to the height of the point from the plane and inversely proportional to its depth from the camera. We exploit the above theorem to infer 3D height information from oblique aerial 2D images. We use direct methods to register the aerial images, develop methods to infer heightinformation under the following three conditions: (i) focal length and image center are both known, (ii) only the focal length is known, and (iii) both are unknown. 1 Introduction Traditional methods in motion analysis have expressed the image motion of rigid bodies as a sum of two image displacement fields: a rotation field and a epipolar (translation) field. In this paper, wedevelop an alternative approac...

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