Hi,
I know, that there is a Bag of Word Mechanism implemented in OpenCV wich can be used with various Matcher to do Image Categorization, but I coudn't find an implementation of the very popular Visual Vocabulary Tree proposed by Nister and Stewenius: http://www-inst.eecs.berkeley.edu/~cs294-6/fa06/papers/nister_stewenius_cvpr2006.pdf
It serves as a faster method to build visual vocabularies as well as a faster approach to find matches. It's a combination of hierarchical clustering, bag of words and a scoring mechanism also used for text retrieval.
I wonder, if OpenCV already has implemented it, and I am simply missing it?
Otherwise I think, it would be a great addition to the OpenCV library.
best regards