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2012-08-16 22:21:39 -0600	asked a question	How to control Dense SIFT `Ptr<FeatureDetector> detector = FeatureDetector::create("Dense");` I want to control how to detect features, such as step. How can I do it before calling detect instructions. It's best to use factory method, because I want to change different feature detector conveniently. `detector->detect(image, keypoints);` Thanks.