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Clustering binary descriptors

asked 2013-04-26 04:44:33 -0500

pasztord gravatar image

Is there a way to cluster binary descriptors in opencv? Kmeans and knn accepts float data. Can I convert binary descriptors to float while keeping the information consistent?

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answered 2013-04-26 15:52:29 -0500

Guanta gravatar image

Which clustering method did you mean? Your question is a little bit vague.

flann can handle binary features well, but the centers which you'll get will be in float (the same would probably happen if you modify the OpenCV-kmeans). Or do you actually just need the nearest neighbor for binary features? Then you can use the BruteForceMatcher-class in conjunction with Hamming-distance or flann with Hamming or LSH.

Afaik, sth like k-medoids (where the output-centers are discrete features) is currently not implemented in OpenCV, neither is agglomerative hierarchical clustering. I am also waiting that this will be part of OpenCV sometime...

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Asked: 2013-04-26 04:44:33 -0500

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Last updated: Apr 26 '13