hough_transform.h

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//
// stuart meikle Tue Mar  7 16:12:54 2000
//


// today: i'll define the hough transform as being a double image. 
// in theory it could be any kind of image, so you might want to change
// this class to template<typename T> as some point



#ifndef HOUGH_TRANSFORM_H
#define HOUGH_TRANSFORM_H

#include <boost/numeric/ublas/vector.hpp>
#include <boost/shared_ptr.hpp>
#include "object.h"
#include "image.h"
#include "line.h"
#include "angle.h"

namespace mimas {
class hough_transform : public image<double>
{
 private:
  int calcGaussBoxSize( double sigma, double accuracy );

  //stumeikle Sun May 26 11:29:24 2002
  //adding some functionality to speed up plotting of points
   boost::shared_ptr< image< double > > bell_curve;    

 public:
   typedef boost::numeric::ublas::vector< double > Vector;
   typedef boost::numeric::ublas::vector< int > IntVector;
  hough_transform(void)
  {
    //nothing to do. the underlying image still needs to be initialised in the
    //usual manner
    // bell_curve=NULL;
  }

  //hough transform like functions
  void  addGaussPoint( const IntVector &posn, double weight, double sigma, double precision );
  void  addGaussLine(  line line, double weight, double sigma, double precision );
  void  addSlopedGaussLine( line line, double weight, double sigma, double precision );
  bool  lineHitsPoint( const IntVector &point, line line, double sigma, double precision ); 
  void  makeAngleEntry(angle a, double sigma, double prec );
  void  normalize(void);
  angle getAngle( void );
  
  void  initFastGauss( double sigma, double precision );
  void  addGaussPointFast( const IntVector &posn );//, double weight );
  void  addGaussLineFast( line line, double weight );
};

};

#endif

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