OpenCV:features2d 2D Features Framework cv::Feature2D 2D Features framework (feature2d module) cv::Feature2D Class Reference Categories Feature Detection and Description Descriptor Matchers Drawing Function of Keypoints and Matches Object Categorization Hardware Acceleration Layer Favorite site OpenCV 2.4.13.0 documentation » OpenCV API Reference » features2d. 2D Features Framework » Common Interfaces of Feature Detectors