• 特許有り [expired]"Method and apparatus for identifying scale invariant features in an image and use of same for locating an object in an image," David G. Lowe, US Patent 6,711,293 (March 23, 2004) • opencvに実装あり。opencvのコード利⽤許諾はライセンス再表記? https://github.com/opencv/opencv/blob/master/modules/features2d/src/sift.simd.hpp SURF ⾮商⽤、再配布禁⽌ • 公式実装 https://people.ee.ethz.ch/~surf/download.html • 特許有り • opencv contribに実装あり。 KAZE BSD 3-Clause "New" or "Revised" License • 公式実装 https://github.com/pablofdezalc/kaze/blob/master/LICENSE • opencvに実装有り AKAZE BSD 3-Clause "New" or "Revised" License • 公式実装 https://github.com/pablofdezalc/akaze/blob/master/LICENSE • opencvに実装あり。 BRIEF GPL v2 • 公式実装 https://www.epfl.ch/labs/cvlab/research/descriptors-and-keypoints/research- detect-brief/ • opencvに実装有り ORB ? • opencvに実装有り