I have been reading information about FREAK descriptor and I understand it is a binary descriptor that claims to be more robust than previous descriptors.
Reading the publication I noticed that they use a scale-space FAST (that works in pyramids with the image scale) detector for evaluation of FREAK. That means that they detect keypoints with fast and then compute descriptors with FREAK.
QUESTION
I don't understand then which is the aim of the OpenCV function
FREAK::selectPairs(images, keypoint, corrTresh, verbose);
Is this supossed to be a kind of detector for FERAK? Which are the input/output parameters of the function?