### Navigation

- index
- next |
- previous |
- OpenCV 3.0.0-dev documentation »
- OpenCV API Reference »

# xfeatures2d. Extra 2D Features Framework

- Experimental 2D Features Algorithms
  - StarFeatureDetector
  - BriefDescriptorExtractor
  - FREAK
  - FREAK::FREAK
  - FREAK::selectPairs
- Non-free 2D Features Algorithms
  - SIFT
  - SIFT::SIFT
  - SIFT::operator ()
  - SURF
  - SURF::SURF
  - SURF::operator()
  - cuda::SURF_CUDA

## Help and Feedback

You did not find what you were looking for?

- Ask a question on the Q&A forum.
- If you think something is missing or wrong in the documentation, please file a bug report.

### Navigation

- index
- next |
- previous |
- OpenCV 3.0.0-dev documentation »
- OpenCV API Reference »