这距离函数确实openCVs flannBasedMatcher使用，是有可能更改默认？ 在从由Muja和Lowe原始FLANN用户手册也有一些不同的距离的类型（flann_distance_t）和我没有看到在OpenCV中的方法，以改变它们： - /
Answer 1:
这是非常糟糕记录在OpenCV的代码，但对于flannBasedMatcher的默认设置是在这两个函数发现
FLANN :: SearchParams（）; // 32次检查，0，排序=真FLANN :: KDTreeIndexParams（）; //使用4个随机KD树
默认情况下，距离函数是FLANN_DIST_L2。
我觉得这段代码解释了为什么还不能改变它printf("[WARNING] You are using cv::flann::Index (or cv::flann::GenericIndex) and have also changed the distance using cvflann::set_distance_type. This is no longer working as expected cv::flann::Index always uses L2). You should create the index templated on the distance, for example for L1 distance use: GenericIndex< L1<float> > \n"); \ printf("[WARNING] You are using cv::flann::Index (or cv::flann::GenericIndex) and have also changed the distance using cvflann::set_distance_type. This is no longer working as expected cv::flann::Index always uses L2). You should create the index templated on the distance, for example for L1 distance use: GenericIndex< L1<float> > \n"); \
文章来源: Which distance function does FlannBasedMatcher use and how to change it?
