Apparatus and method for extracting correspondences between aerial images
First Claim
1. An apparatus for extracting correspondences between aerial images, comprising:
- one or more processors configured to;
extract lines corresponding buildings from two or more aerial images;
define directions of the lines as x, y and z axis directions based on a coordinate system of a two-dimensional (2D) image;
rotate 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 extract building top areas from rectangles that are formed by the rotation;
extract correspondences between the aerial images by comparing locations of the building top areas extracted from the aerial images;
create a direction distribution histogram of the lines, and define directions having three highest peak values in the direction distribution histogram as x, y, and z axis directions, respectively;
define one of the highest peak value directions closest to a vertical direction as the z axis direction and two remaining highest peak value directions as the x and y axis directions, respectively; and
define an arbitrary one of the two remaining highest peak value directions as the x axis direction and a remaining highest peak value direction as the y axis direction.
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Abstract
Disclosed herein is an apparatus and method for extracting correspondences between aerial images. The apparatus includes a line extraction unit, a line direction determination unit, a building top area extraction unit, and a correspondence extraction unit. The line extraction unit extracts lines corresponding buildings from aerial images. The line direction determination unit defines the directions of the lines as x, y and z axis directions based on a two-dimensional (2D) coordinate system. The building top area extraction unit rotates lines in the x and y axis directions so that the lines are arranged in parallel with the horizontal and vertical directions of the 2D image, and then extracts building top areas from rectangles. The correspondence extraction unit extracts correspondences between the aerial images by comparing the locations of the building top areas extracted from the aerial images.
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Citations
12 Claims
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1. An apparatus for extracting correspondences between aerial images, comprising:
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one or more processors configured to; extract lines corresponding buildings from two or more aerial images; define directions of the lines as x, y and z axis directions based on a coordinate system of a two-dimensional (2D) image; rotate 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 extract building top areas from rectangles that are formed by the rotation; extract correspondences between the aerial images by comparing locations of the building top areas extracted from the aerial images; create a direction distribution histogram of the lines, and define directions having three highest peak values in the direction distribution histogram as x, y, and z axis directions, respectively; define one of the highest peak value directions closest to a vertical direction as the z axis direction and two remaining highest peak value directions as the x and y axis directions, respectively; and define an arbitrary one of the two remaining highest peak value directions as the x axis direction and a remaining highest peak value direction as the y axis direction. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-transitory computer readable medium encoded with a computer program for extracting correspondences between aerial images, the program when executed by a computer causes the computer to perform a method comprising:
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extracting lines corresponding buildings from two or more aerial images; defining directions of the lines as x, y and z axis directions based on a coordinate system of a 2D image; 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; extracting correspondences between the aerial images by comparing locations of the building top areas extracted from the aerial images; creating a direction distribution histogram of the lines, and defines directions having three highest peak values in the direction distribution histogram as x, y, and z axis directions, respectively; defining one of the highest peak value directions closest to a vertical direction as the z axis direction and two remaining highest peak value directions as the x and y axis directions, respectively; and defining an arbitrary one of the two remaining highest peak value directions as the x axis direction and a remaining highest peak value direction as the y axis direction. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification