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基于空间分布描述符的SIFT误匹配校正方法

DOI: 10.11834/jig.20090721

Keywords: 空间分布描述符,SIFT特征描述符,独特性,校正误匹配

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Abstract:

针对SIFT(scaleinvariantfeaturetransform)特征描述符因仅利用特征点的局部邻域信息而对散落在图像内相似结构中的点极易发生误匹配的现象,提出了一种基于空间分布描述符的SIFT误匹配校正方法。该方法首先利用SIFT算法进行匹配;然后对于匹配结果中的特征点,再利用图像轮廓像素点对该点的空间分布信息进行重新描述,以形成一种独特性更高的空间分布描述符;最后运用此种描述符,对匹配结果中存在的“一对多”和“一对一”的错误匹配形式,分别采取两种不同的匹配策略进行校正。以真实图像进行的实验结果表明,该方法与RANSAC(随机抽样一致性)算法相比,其在不损失正确匹配的前提下,能够真正提高正确匹配率。

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