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What is points (in your last line of code)? Shouldn't it be points1?

And are you sure of your syntax? Maybe it is correct, but I use the following:

cv::FastFeatureDetector detector(50);
cv::FREAK extractor;

detector.detect(img, points);
extractor.compute(img, points, descriptors);

What is "points " (in your last line of code)? Shouldn't it be "points1?"?

And are you sure of your syntax? Maybe it is correct, but I use the following:

cv::FastFeatureDetector detector(50);
cv::FREAK extractor;

detector.detect(img, points);
extractor.compute(img, points, descriptors);