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 _OPENSURF_SURFH
#define _OPENSURF_SURFH

#include "opencv/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<OpenSurfInterestPoint> &ipts);

	//! Describe all features in the supplied vector
	void getDescriptors(bool bUpright = false);

private:

	//---------------- Private Functions -----------------//

	//! Assign the current OpenSurfInterestPoint an orientation
	void getOrientation();

	//! Get the descriptor. See Agrawal ECCV 08
	void getDescriptor(bool bUpright = false);

	//! 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 OpenSurfInterestPoint in the vector
	int index;
};


#endif