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FREAK will only extract descriptors. You need to detect features points first, for instance using FAST. Here is a small sample of what you could do:

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

std::vector<cv::KeyPoint> keypoints1, keypoints2;
cv::Mat descriptors1, descriptors2;
std::vector<cv::DMatch> matches;

detector.detect(frame1, keypoints1);
extractor.compute(frame1, keypoints1, descriptors1);
detector.detect(grayFrame2, keypoints2);
extractor.compute(grayFrame2, keypoints2, descriptors2);

Notice that FREAK extracts binary descriptors, which is different than SURF.

Hope it helps.

FREAK will only extract descriptors. You need to detect features points first, for instance using FAST. Here is a small sample of what you could do:

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

std::vector<cv::KeyPoint> keypoints1, keypoints2;
keypoints;
cv::Mat descriptors1, descriptors2;
std::vector<cv::DMatch> matches;
descriptors;
 detector.detect(frame1, keypoints1);
extractor.compute(frame1, keypoints1, descriptors1);
detector.detect(grayFrame2, keypoints2);
extractor.compute(grayFrame2, keypoints2, descriptors2);
detector.detect(img, keypoints);
extractor.compute(img, keypoints, descriptors);

Notice that FREAK extracts binary descriptors, which is different than SURF.

Hope it helps.