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Star Detector, BRIEF and FREAK listed in nonfree modules

Looking for information on the aforementioned detectors, I noticed they are listed in the "Non-free 2D Features Algorithms" section of the OpenCV docs. See: http://docs.opencv.org/trunk/modules/xfeatures2d/doc/extra_features.html

I thought only SURF and SIFT were non-free... Could someone confirm the info? It might be only an error in the title of the section, though!

Star Detector, BRIEF and FREAK listed in nonfree modules

Looking for information on the aforementioned detectors, I noticed they are listed in the "Non-free 2D Features Algorithms" section of the OpenCV docs. See: http://docs.opencv.org/trunk/modules/xfeatures2d/doc/extra_features.html

I thought only SURF and SIFT were non-free... Could someone confirm the info? It might be only an error in the title of the section, though!