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Cannot reproduce. Can you provide more details? Did you build it yourself, which version, x64/x86, platform, compiler ect. ect.

Mat img(1000, 1000, CV_8UC3);
vector<KeyPoint> kps;
auto pFREAK = xfeatures2d::FREAK::create();
Mat desc;
pFREAK->compute(img, kps, desc);
std::cout << desc.rows << "  " << desc.cols << "\n";

result: 0 0