Patent Document ID: 9508159
Application ID: 14327681
Patent Status: 1

Claim One:
1. An image database constructing device for constructing image database, comprising: an image input unit for receiving a photographed image with photographing information of the image; and a building identification unit configured to: construct a three-dimensional sphere from at least one photographed image, identify a spot corresponding to a photographing position of the photographed image in a three-dimensional map, and set the three-dimensional sphere in the spot of the three-dimensional map based on the photographing information of the photographed image, map the photographed image to the three-dimensional map based on the three-dimensional sphere and the photographing information of the photographed image to create a three-dimensionally mapped image, project direction vectors toward respective locations of the three-dimensionally mapped image from the photographing position of the three-dimensionally mapped image, determine whether the direction vectors collide with a location in the three-dimensionally mapped image, assign an identifier to a location that is collided with the direction vectors and distinguish a building from the location in the three-dimensionally mapped image based on the identifier, and determine, if a first direction vector projected to a first location of the photographed image collides with a three-dimensional object of the three-dimensional map, the first location as a building area.