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Your syntax is incorrect. Since selectPairs() is not a declared as static function, it can only be called by an instance of the class.

So you have write something like this instead:

FREAK myFreak;
myFreak.selectPairs(images, keypoints, 0.7, true)

Your syntax is incorrect. Since selectPairs() is not a declared as static function, it can only be called by an instance of the class.

So you have write something like this instead:

FREAK myFreak;
myFreak.selectPairs(images, keypoints, 0.7, true)
true);