note "Per readability and simplicity in this diagram\n there are only two TrackerFeature but you\n can considering the implementation of the other TrackerFeature" as N1
TrackerFeatureHOG .. N1
TrackerFeatureFeature2D .. N1
}
note"Per readability and simplicity in this diagram\n there are only two TrackerFeature but you\n can considering the implementation of the other TrackerFeature"asN1