surf.h

/*********************************************************** 
*  --- OpenSURF ---                                        *
*  This library is distributed under the GNU GPL. Please   *
*  contact chris.evans@irisys.co.uk for more information.  *
*                                                          *
*  C. Evans, Research Into Robust Visual Features,         *
*  MSc University of Bristol, 2008.                        *
*                                                          *
************************************************************/

#ifndef SURF_H
#define SURF_H

#include "cv.h"
#include "ipoint.h"
#include "integral.h"

#include <vector>

class Surf {
  
  public:
    
    //! Destructor
    ~Surf();

    //! Standard Constructor (img is an integral image)
    Surf(IplImage *img, std::vector<Ipoint> &ipts);

    //! Describe all features in the supplied vector
    void getDescriptors(bool upright);
  
  private:
    
    //---------------- Private Functions -----------------//

    //! Assign the current Ipoint an orientation
    void getOrientation();
    
    //! Get the descriptor vector of the current Ipoint
	  void getDescriptor();

    //! Get the upright descriptor vector of the current Ipoint
    void getUprightDescriptor();

    //! Calculate the value of the 2d gaussian at x,y
    inline float gaussian(int x, int y, float sig);
    inline float gaussian(float x, float y, float sig);

    //! Calculate Haar wavelet responses in x and y directions
    inline float haarX(int row, int column, int size);
    inline float haarY(int row, int column, int size);

    //! Get the angle from the +ve x-axis of the vector given by [X Y]
    float getAngle(float X, float Y);


    //---------------- Private Variables -----------------//

    //! Integral image where Ipoints have been detected
    IplImage *img;

    //! Ipoints vector
    IpVec &ipts;

    //! Index of current Ipoint in the vector
    int index;
};


#endif