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| Image Registration Based on Well-Distributed Corners with Sub-Pixel Localization |
| Ge Yong-xin①,Yang Dan②,Lei Ming③ |
| ①College of Computer Science, Chongqing University, Chongqing 400030, China; ②School of Software Engineering, Chongqing University, Chongqing 400030, China; ③College of Mathematics & Physics, Chongqing University, Chongqing 400030, China |
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Abstract To deal with the false and unstable corners, high computational complexity and incorrect matching, a new image registration algorithm is proposed based on corners which are well-distributed in image and with sub-pixel localization precision. Firstly corners in an image are detected by multi-scale Harris operator, which are taken as initial interest points. And then adaptive non-maximal suppression is used to limit the number of interest points, so the computational complexity is decreased and the efficiency of the algorithm is improved. At the mean time, the corners are made to be well-distributed in image. Since the location of initial Harris corners have offset and false corners have existed, sub-pixel localization technique is applied to determine the location of corners and eliminate the false and unstable corners in this process. Finally, RANSAC is used to estimate the parameters robustly based on initial matching. Experiments showed that the proposed algorithm has a good performance of efficiency, accuracy and robustness.
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Received: 04 August 2008
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Corresponding Authors:
Ge Yong-xin
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2010, Vol. 32 
