Float vector based image feature has high dimension and usually makes use of Euclidean distance as its similarity definition.
浮点矢量图像特征维数较高，且通常以欧氏距离作为矢量之间的相似度定义。
The distance function is used for similarity measure of image feature vector and realizes the matching of feature vector.
用距离函数对图像的特征向量进行相似性度量，从而实现SIFT特征向量的匹配。
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