| 利用改进的SUSAN算法提取航空影像中孤立的特征点 |
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| 引用本文： | 杜艺,龚循平.利用改进的SUSAN算法提取航空影像中孤立的特征点[J].测绘科学,2011,36(6):131-132,94. |
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| 作者姓名： | 杜艺 龚循平 |
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| 作者单位： | 中国测绘科学研究院,北京,100039 |
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| 摘 要： | 本文针对地形起伏较大、无明显建筑物的航空影像,分析了SUSAN算法角点检测理论,提出一种提取孤立特征点的方法.该方法先对图像进行梯度幅值运算,然后对梯度幅值进行Otsu法阈值分割,设计模板并对孤立特征点进行套合,最后利用SUSAN算法计算原始影像的角点初始响应,经过非极大值抑制提取孤立特征点.经实骑证明,与传统的Har...
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| 关 键 词： | 特征点提取 SUSAN算法 角点检测 阈值分割 |
Extracting isolated feature points in aerial images by using improved SUSAN algorithm |
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| DU Yi,GONG Xun-ping.Extracting isolated feature points in aerial images by using improved SUSAN algorithm[J].Science of Surveying and Mapping,2011,36(6):131-132,94. |
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| Authors: | DU Yi GONG Xun-ping |
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| Institution: | (Chinese Academy of Surveying and Mapping,Beijing 100039,China) |
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| Abstract: | The paper analyzed the theory of SUSAN algorithms for the aerial images with obvious terrain changes and almost without architectural buildings,developed a method of extracting isolated feature points.Firstly,the method computed the gradient magnitude,made a threshold segmentation using Otsu,then designed a template to cover the segmentation result and gave the initiated values,finally computed the corner measurement on the original images using SUSAN algorithm,and got the isolated feature points after the non-maximum suppression.The experiment demonstrated that the external conditions including terrain changes,Solar elevation angle and shift of viewpoint had a little effect on the points,which made a full preparation for the next matching step. |
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| Keywords: | feature points extraction SUSAN algorithm corner detection threshold segmentation |
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