Clustering function OpenCV cvKMeans2 () - what type of cluster center in the array?

Question

I am using the cvKMeans2 () function from the OpenCV library for clustering. It has an optional parameter:
centers - Optional output array of cluster centers
The same parameter is also in the kmeans () function.

I want to know cluster information. But I did not find what the type of cluster center in the array is, so I can not get it.

Thanks for any tips!

Answer 1

In OpenCV 2.0, the equivalent kmeans function accepts the CV_32FC1 matrix, but OpenCV 2.0 is a pretty significant upgrade to the old kmeans2 function, so I cannot be sure that the cluster data type will still be the same for OpenCV 1.1.

Answer 2

This shows that the “centers” parameter is of the same type as the first parameter, which the other documentation says:

The CvArr metatype is used only as a parameter of a function to indicate that the function sometimes accepts arrays of several types, such as IplImage *, CvMat *, or even CvSeq *. A specific array type is determined at runtime by parsing the first 4 bytes of the header.

Which, combined with this question , makes me think that you should try passing a CV array (vector) to get the centers.

Answer 3

I think this may help:

http://opencv.willowgarage.com/documentation/clustering_and_search_in_multi-dimensional_spaces.html#cvKMeans2