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A Geometric Rectification Algorithm of Scanned Topographic Map Based on Hough Transform |
LI Guan-yi1, 2 , LIN You-ming 1 |
( 1. China Remote Sensing Satellite Ground Station, Beijing 100086, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100039, China) |
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Abstract This paper gives a thorough study on geometric rectification of scanned to pographic map. There are many distortions caused by some reasons in scanned topographic maps. So they must be rectified before we use them. To reduce distortions effectively, the method of triangulation with grid points could be used usually for geometric rectification and lots of control points are required. But it' s too hard to extract grid points manually. In order to identify all grid points automatically , a novel geometric rectification algorithm of scanned topographic map is presented in this paper , which is based on the improved hought ransform.At first, we calculate the initial positions of grid points approximately using information of topography map, and make a “十”shape search area around each grid predicted point . And then, hough transform is used to detect grid lines in every search area and the intersections of grid lines are calculated. Finally, themap is rectified triangularly by affine transform, with intersections detected by hough transform as reference point s. Experimental results have showed that this method had the high precision performance to realize the sub-pixel precision extraction of grid points and no need to find reference points one by one manually . And it's also faster than traditional manual method.
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Received: 04 December 2005
Published: 27 September 2011
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