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void surf_detection(Mat img_1,Mat img_2); you cant get out img_2 you only send a copy of img_2 So change function like void surf_detection(Mat img_1,Mat& img_2)

void surf_detection(Mat img_1,Mat img_2); img_2);

you cant get out img_2 you only send a copy of img_2 So change function like like

void surf_detection(Mat img_1,Mat& img_2)