MethodchooseCentersKMeanspp* Chooses the initial centers in the k-means using the algorithm
* proposed in the KMeans++ paper:
* Arthur, David; Vassilvitskii, Sergei -
Chapter2_iPhoneAR/Example_MarkerBasedAR/opencv2.framework/Versions/A/Headers/flann/hierarchical_clustering_index.h:201