关键词: 道路工程, 图像失真, 图像还原, 坐标转换

Abstract:

Numerical image distortion is a significant problem during image capture of airport pavement, leading to difficulties in image connection and damage identification. To solve this problem, pinhole imaging theory of camera is studied, by which the original point of global coordinate system is set on pavement and the original point of local coordinate system is set on numerical image. By 3D coordinate transformation formula, the key corner point coordinates of numerical image in local coordinate system is transferred to the coordinates of global coordinate system, and then the actual numerical image of pavement plate could be achieved and the actual numerical image of pavement in larger scale could be obtained by connecting numerical images of different pavement plates. Outdoor
test is conducted in order to evaluate the theoretical reliability. In the test, white pieces of paper in A0 size are used to simulate pavement plate, and the connections of them are painted in black to simulate sealing material.Different pavement damages are set on the simulated plate, and camera is used to capture pavement images from different angles. Results show that the image reproducting ability of runway pavement image is good by this method, which could be used in the application and research of intelligent evaluation technology of pavement damage condition.

Key words: road engineering, image distortion, image reproduction, coordinate transformation