Object detection Rectangles Haartrained

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Hi everyone!!

I wanted my program to identify staplers so i've followed the haartraining process and i've accomplished my goal. The only problem is that instead of one "stapler", it draws more than one rectangle.

I've though of using groupRectangles(...) but it doesn't compile saying it's not declared and stuff like that (i though its lib was objdetect: guess i was wrong)

Please, any tip would be welcome. Thanks