fast-yolo4/3rdparty/opencv/inc/opencv2/xfeatures2d/nonfree.hpp

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#ifndef __OPENCV_XFEATURES2D_FEATURES_2D_HPP__
#define __OPENCV_XFEATURES2D_FEATURES_2D_HPP__

#include "opencv2/features2d.hpp"

namespace cv
{
namespace xfeatures2d
{

/** @brief Class for extracting Speeded Up Robust Features from an image @cite Bay06 .

The algorithm parameters:
-   member int extended
    -   0 means that the basic descriptors (64 elements each) shall be computed
    -   1 means that the extended descriptors (128 elements each) shall be computed
-   member int upright
    -   0 means that detector computes orientation of each feature.
    -   1 means that the orientation is not computed (which is much, much faster). For example,
if you match images from a stereo pair, or do image stitching, the matched features
likely have very similar angles, and you can speed up feature extraction by setting
upright=1.
-   member double hessianThreshold
Threshold for the keypoint detector. Only features, whose hessian is larger than
hessianThreshold are retained by the detector. Therefore, the larger the value, the less
keypoints you will get. A good default value could be from 300 to 500, depending from the
image contrast.
-   member int nOctaves
The number of a gaussian pyramid octaves that the detector uses. It is set to 4 by default.
If you want to get very large features, use the larger value. If you want just small
features, decrease it.
-   member int nOctaveLayers
The number of images within each octave of a gaussian pyramid. It is set to 2 by default.
@note
   -   An example using the SURF feature detector can be found at
        opencv_source_code/samples/cpp/generic_descriptor_match.cpp
    -   Another example using the SURF feature detector, extractor and matcher can be found at
        opencv_source_code/samples/cpp/matcher_simple.cpp
 */
class CV_EXPORTS_W SURF : public Feature2D
{
public:
    /**
    @param hessianThreshold Threshold for hessian keypoint detector used in SURF.
    @param nOctaves Number of pyramid octaves the keypoint detector will use.
    @param nOctaveLayers Number of octave layers within each octave.
    @param extended Extended descriptor flag (true - use extended 128-element descriptors; false - use
    64-element descriptors).
    @param upright Up-right or rotated features flag (true - do not compute orientation of features;
    false - compute orientation).
     */
    CV_WRAP static Ptr<SURF> create(double hessianThreshold=100,
                  int nOctaves = 4, int nOctaveLayers = 3,
                  bool extended = false, bool upright = false);

    CV_WRAP virtual void setHessianThreshold(double hessianThreshold) = 0;
    CV_WRAP virtual double getHessianThreshold() const = 0;

    CV_WRAP virtual void setNOctaves(int nOctaves) = 0;
    CV_WRAP virtual int getNOctaves() const = 0;

    CV_WRAP virtual void setNOctaveLayers(int nOctaveLayers) = 0;
    CV_WRAP virtual int getNOctaveLayers() const = 0;

    CV_WRAP virtual void setExtended(bool extended) = 0;
    CV_WRAP virtual bool getExtended() const = 0;

    CV_WRAP virtual void setUpright(bool upright) = 0;
    CV_WRAP virtual bool getUpright() const = 0;
};

typedef SURF SurfFeatureDetector;
typedef SURF SurfDescriptorExtractor;

//! @}

}
} /* namespace cv */

#endif