Method of extracting 3D building information using shadow...

Details Method of extracting 3D building information using shadow... Method of extracting 3D building information using shadow...

2006-11-06

2010-06-08

Ahmed, Samir A (Department: 2624)

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

C382S100000

Reexamination Certificate

active

07733342

ABSTRACT:
Disclosed herein is a method of extracting three-dimensional building information using shadow analysis. In the method, 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 is received, the azimuth and altitude angles of a sun in an area of capture, and the azimuth and altitude angles of a camera are calculated. The contour of the roof of the building, the location and height of which are desired to be obtained, is extracted from the image. A height value is assigned to the extracted contour of the roof of the building, and the height value is adjusted until the assigned height value satisfies a predetermined condition. The vertical line and shadow of the building, which are based on the height value, is projected onto the image. The location of the building is extracted using the height value and vertical line of the building if the location of the projected shadow coincides with the location of the shadow of the building.

REFERENCES:
Chu-Soo Ye et al.. ,Journal of the Korean Siciety of Remote Sensing, vol. 16, No. 3, 2000, pp. 235-242 (in Korean including English Abstract).
Chul-Soo Ye et al., Journal of the Korean Society of Remote Sensing, vol. 16, No. 3, 2000, pp. 235-242 (in Korean including English Abstract).

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