Patent Document ID: 20120155745
Application ID: 13325957
Patent Status: 0

Claim One:
1. An apparatus for extracting correspondences between aerial images, comprising: a line extraction unit for extracting lines corresponding buildings from two or more aerial images; a line direction determination unit for defining directions of the lines as x, y and z axis directions based on a coordinate system of a two-dimensional (2D) image; a building top area extraction unit for rotating lines in the x axis direction and lines in the y axis direction so that the lines in the x axis direction are arranged in parallel with a horizontal direction of the 2D image and the lines in the y axis direction are arranged in parallel with a vertical direction of the 2D image, and then extracting building top areas from rectangles that are formed by the rotation; and a correspondence extraction unit for extracting correspondences between the aerial images by comparing locations of the building top areas extracted from the aerial images.