# Hierarchical Clustering with Flann

I have a problem, I need to clusterize a set of points in an unknown number of clusters. I use cv::flann::hierarchicalClustering. Someone that use this function could help me? Another question is about the return value that should be the number of clusters, but how could I understand which are the cluster? I created a cv::Mat points with dimensions n x 2 where n is the number of points.

Thanks in advance.