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Opencv 3.0 FAST Corner Detection

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I am beginner in OpenCV. I have problem implement FAST algoritmus in Vsual Studio with version OpenCV 3.0. I have tried following implementation in c++: src = imread("../images/right.jpg", CV_LOAD_IMAGE_GRAYSCALE); Ptr detector = FastFeatureDetector::create(TRESHOLD); vector keypointsD; with (but both realizations are BAD) detector->detect(src, keypointsD); drawKeypoints(src, keypointsD, output); imshow(window_name, output); or FAST(src, keypointsD, TRESHOLD, true); //fast detector drawKeypoints(src, keypointsD, output); imshow(window_name, output); Can you help me with any example or what Do I do bad?

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