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edge_detector.h

Go to the documentation of this file.

#ifndef __EDGE_DETECTOR__
#define __EDGE_DETECTOR__


#include "base_2D.h"

namespace Function_2D{


  /*
    #################
    # Canny Deriche #
    #################
  */

  class Canny_Deriche:public Filter_interface_2D{

  public:
    inline Canny_Deriche(const real_type center_x = 0,
                         const real_type center_y = 0,
                         const real_type sigma_x = 1,
                         const real_type sigma_y = 1,
                         const real_type orientation_angle = 0);

  protected:
    virtual inline real_type base_value_proxy(const real_type x,
                                              const real_type y) const;

  };



  /*
    ###############
    # Shen Castan #
    ###############
  */

  class Shen_Castan:public Filter_interface_2D{

  public:
    inline Shen_Castan(const real_type center_x = 0,
                       const real_type center_y = 0,
                       const real_type sigma_x = 1,
                       const real_type sigma_y = 1,
                       const real_type orientation_angle = 0);

  protected:
    virtual inline real_type base_value_proxy(const real_type x,
                                              const real_type y) const;

  };

  
/*
  ###########################################################
  ###########################################################
  ###########################################################
  ##############                               ##############
  ##############  I M P L E M E N T A T I O N  ##############
  ##############                               ##############
  ###########################################################
  ###########################################################
  ###########################################################
*/


/*
  #################
  # Canny Deriche #
  #################
*/
  Canny_Deriche::
  Canny_Deriche(const real_type center_x,
                const real_type center_y,
                const real_type sigma_x,
                const real_type sigma_y,
                const real_type orientation_angle):
    Filter_interface_2D(center_x,center_y,
                        sigma_x,sigma_y,
                        1,1,
                        orientation_angle,
                        1){}

  Canny_Deriche::real_type
  Canny_Deriche::base_value_proxy(const real_type x,
                                  const real_type y) const{
    
    return -x*exp(-fabs(x)-0.5*y*y);
  }


  /*
    ###############
    # Shen Castan #
    ###############
  */
  
  Shen_Castan::Shen_Castan(const real_type center_x,
                           const real_type center_y,
                           const real_type sigma_x,
                           const real_type sigma_y,
                           const real_type orientation_angle):
    Filter_interface_2D(center_x,center_y,
                        sigma_x,sigma_y,
                        1,1,
                        orientation_angle,
                        1){}
  
  Shen_Castan::real_type
  Shen_Castan::base_value_proxy(const real_type x,
                                const real_type y) const{

    const real_type s = (x==0) ? 0 : ((x>0) ? 1 : -1);
    
    return -s*exp(-fabs(x)-0.5*y*y);
  }
}

#endif

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