Question

I have to use kmeans in my future work, I know it is available in OpenCV as they have a documentation page on it.

I cannot make sense of the format displayed, it has also not been explained in the given details below (it appears to be details related to OpenCV 1.1). I mean, with the C++ line:

double kmeans(InputArray data, int K, InputOutputArray bestLabels, TermCriteria criteria, int attempts, int flags, OutputArray centers=noArray() )

what datatype is data, vector or matrix? which is the input matrix, which will be the output?

I am used to reading documentation like this where it is clearly stated which is the input/output/flag etc and what data types they are.

C++: void FeatureDetector::detect(const Mat& image, vector<KeyPoint>& keypoints, const Mat& mask=Mat() ) const

I would really appreciate if someone could give a short example of kmeans being used.

P.S. the input matrix I have ready to be used for kmeans is the one produces by DescriptorExtractor::compute

Thank you

Answer 1

You can find examples of using most of OpenCV‘s functions in folder samples. In your situation take a look at these two:

1. kmeans.cpp
2. matcher_simple.cpp