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FREAK descriptor type with selectPairs

Hi everyone!

I am developing a tracker, I was using SURF features and descriptors, and I want to try the FREAK descriptor.

I have read the paper of the autor and I understand more or less the procedure but I have some doubts wiht the opencv implementation.

The return of selectPairs() is a int vector, but to match them I think is needed unsigned char because with other types I get an execution error.

What I do now is: -extract features with ORB (for example) -select pairs -copy the result into a Mat (there I have to cast from int to char) -call match with the Mat

Am I doing correctly? Is there an important speed up with flann instead bruteforce? (small sets to match)