Method for measuring three-dimensional absolute position of object to be measured and method for detecting position of molten material

Abstract

A method includes measuring three-dimensional coordinates of a point from a remote position even in a case where the point is in a dangerous zone where a person cannot enter and directly measure coordinates. The method is for measuring, from an image, a three-dimensional absolute position of a measurement point present on a plane including any three points on an object to be measured by using a three-dimensional orthogonal coordinate system. The method includes measuring a relative position between a reference point present on the plane and a camera, acquiring an image by imaging the measurement point by the camera, calculating, from the image, three-dimensional relative position coordinates of the measurement point while using a lens position of the camera as an origin, and calculating the three-dimensional absolute position of the measurement point from the relative position and the three-dimensional relative position coordinates.

Dependencies are inferred from the claim text.