| OpenCV 3.4.8 Open Source Computer Vision

Classes | Namespaces | Typedefs
nonfree.hpp File Reference
`#include "opencv2/features2d.hpp"`

## Classes
class | cv::xfeatures2d::SIFT
| Class for extracting keypoints and computing descriptors using the Scale Invariant Feature Transform (SIFT) algorithm by D. Lowe [129] . More...
class | cv::xfeatures2d::SURF
| Class for extracting Speeded Up Robust Features from an image [12] . More...

## Namespaces
| cv
| cv::xfeatures2d

## Typedefs
typedef SIFT | cv::xfeatures2d::SiftDescriptorExtractor
typedef SIFT | cv::xfeatures2d::SiftFeatureDetector
typedef SURF | cv::xfeatures2d::SurfDescriptorExtractor
typedef SURF | cv::xfeatures2d::SurfFeatureDetector