Patent ID: 7733342
Filing Date: 2010-06-08
Classification: G06T

Abstract:
1. A method of extracting three-dimensional building information using shadow analysis, comprising the steps of: receiving an image of a building captured through a manmade satellite, an airplane or some other means, and metadata to be used for extraction of building information; calculating azimuth and altitude angles of a sun in an area of capture by said manmade satellite, airplane, or some other means, and azimuth and altitude angles of a camera; extracting a contour of a roof of the building, a location and a height of which are desired to be obtained, from the image; assigning a height value to the extracted contour of the roof of the building, and projecting a vertical line and shadow of the building, which are based on the assigned height value, onto the image; adjusting the height value until the shadow projected onto the image coincides with a location of the actual shadow of the building existing on the image; extracting the location of the building using the height value and vertical line of the building if the location of the shadow projected onto the image coincides with the location of a shadow of the building existing on the image.