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基于SIFT算子的图像匹配算法研究

Keywords: SIFT,图像匹配,余弦相似度,方向一致性,校正误匹配

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Abstract:

针对目前基于SIFT(scaleinvariantfeaturetransform)的图像匹配算法在匹配相似区域较多的可见光图像时,匹配约束条件单一,没有有效剔除误匹配点,误匹配率高的问题,提出一种匹配改进算法,针对128维SIFT特征向量,采用距离匹配和余弦相似度匹配相结合的测度方法,利用特征点方向一致性进一步降低误匹配率.实验结果表明:改进算法对图像的缩放、旋转、光照、噪声和小尺度的视角变换均有较好的匹配效果.与原算法相比,在保证匹配点数和匹配时间的基础上,改进算法对旋转、缩放、噪声模糊和光照变换的误匹配率平均降低10%~20%,对于小尺度的视角变换,误匹配率平均降低5%.

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