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In 2.4.9, you can still use the Algorithm::set function to change the value of parameters... In your case, you can adjust the "thres" parameter to reduce the number of detected points:

 cv::Ptr<FeatureDetector> detect = FeatureDetector::create("BRISK");
 detect->set("thres", 50);//default value is 30

But in Opencv3, you will have to use the parameters of the BRISK class...