Apparatus for detecting an altitude of a flying object

摘要

A three-dimensional image of a ground surface taken by a stereoscopic camera (10) is converted to a distance image in a stereoscopic processing section (30). In an altitude calculating section (40), after peculiar points contained in the distance image are deleted and further the lens distortion is deleted from the distance image, the distance image is transferred to a real space coordinate. Then, an equation approximating to a plane is obtained from data of the distance image and a length of a perpendicular line to the plane is calculated as a ground altitude.