harris.h

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#ifndef AIMS_MATH_HARRIS_H
#define AIMS_MATH_HARRIS_H

#include <iostream>
#include <aims/bucket/bucketMap.h>
#include <aims/data/data.h>

template <class T>
class BaseHarrisDetector {
  public :
 
    BaseHarrisDetector(const AimsData<T> & image, 
                       const double sigma = 1.2, 
                       const double k = 0.6, 
                       const double epsilon = 1E-3,
                       const T levels = (T)255);
 
    virtual double gaussian(const double x, 
                            const double y, 
                            const double z);
  
    virtual void computeDerivatives() {}
    
    virtual double harrisMeasure(const int x, 
                                 const int y, 
                                 const int z, 
                                 const int t) = 0;
 
    virtual void computeHarrisMap();
    
    virtual bool isSpatialMaxima(const int x, 
                                 const int y, 
                                 const int z, 
                                 const int t) = 0;
  
  
    virtual void computeCorners();

    virtual void filter(int minDistance);
    
    AimsData<double> harrisMap();

    aims::BucketMap<Void> corners();
  
  protected :

    // Parameters
    double _epsilon;
    double _k;
    double _sigma, _sigma2;
    double _u;
    T _levels;
    double _f;
    int _radius;
    int _window;
    
    // Image
    AimsData<T> _image;
    AimsData<double> _g; // Gaussian window
      
    // Harris measure map
    AimsData<double> _hmap;
    
    // Corners
    aims::BucketMap<double> _corners;
};

template <class T, int D>
class HarrisDetector {
};

template <class T>
class HarrisDetector<T, 2>
  : public BaseHarrisDetector<T> {
    
  public :
 
    HarrisDetector(AimsData<T> image, 
                   double sigma = 1.2, 
                   double k = 0.6, 
                   double epsilon = 1E-3,
                   T levels = 255);

    virtual void computeDerivatives();

    virtual double harrisMeasure(const int x, 
                                 const int y, 
                                 const int z, 
                                 const int t);

    virtual bool isSpatialMaxima(const int x, 
                                 const int y, 
                                 const int z, 
                                 const int t);
  
  private :
    // Derivatives
    AimsData<double> _lx2, _ly2, _lxy;
};


#endif