OpenCV_4.2.0/opencv_contrib-4.2.0/modules/xfeatures2d/README.md

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Extra 2D Features Framework

  1. Experimental 2D feature algorithms
  2. Non-free 2D feature algorithms

Extra 2D Features Framework containing experimental and non-free 2D feature detector/descriptor algorithms: SURF, SIFT, BRIEF, Censure, Freak, LUCID, Daisy, Self-similar.