DGtal::detail::DistanceFromDCA Struct Reference

#include <SegmentComputerEstimators.h>

Public Types
typedef std::pair< double, double >	Value

Public Member Functions
template<typename DCA >
Value	operator() (const typename DCA::ConstIterator &it, const DCA &aDCA, const double &aH) const

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Detailed Description

Description of class 'DistanceFromDCA'

Aim: estimates the distance of a given pair of points to the separating circle of a DCA.

Definition at line 933 of file SegmentComputerEstimators.h.

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Member Typedef Documentation

typedef std::pair<double,double> DGtal::detail::DistanceFromDCA::Value

Definition at line 936 of file SegmentComputerEstimators.h.

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Member Function Documentation

template<typename DCA >

Value DGtal::detail::DistanceFromDCA::operator() ( const typename DCA::ConstIterator &  it, const DCA &  aDCA, const double &  aH  ) const

inline

Operator()

Returns:

distances (in a pair) of the inner and outer points pointed by it to the separating circle of aDCA

Parameters:

it	position where the estimation has to be done
aDCA	an instance of segment computer devoted to the DCA recognition.
aH	grid step

Template Parameters:

DCA	a model of segment computer devoted to the DCA recognition, basically geometricDCA.

Definition at line 955 of file SegmentComputerEstimators.h.

      {
        typedef typename DCA::ConstIterator ConstIterator; 
        typedef typename DCA::Pair Pair; 
        typedef typename DCA::Point Point;
        typedef typename Point::Coordinate Coordinate; 
        
        if ( !aDCA.isStraight() )
          {
            //separating circle center
            double c0, c1, r; 
            aDCA.getSeparatingCircle().getParameters(c0, c1, r);
            //points
            Pair pair = *it; 
            Point i = pair.first; 
            Point o = pair.second;
            //distances
            double distI0 = NumberTraits<Coordinate>::castToDouble(i[0]) - c0; 
            double distI1 = NumberTraits<Coordinate>::castToDouble(i[1]) - c1;
            double distI = std::sqrt( distI0*distI0 + distI1*distI1 ) - r; 
            double distO0 = NumberTraits<Coordinate>::castToDouble(o[0]) - c0; 
            double distO1 = NumberTraits<Coordinate>::castToDouble(o[1]) - c1;
            double distO = std::sqrt( distO0*distO0 + distO1*distO1 ) - r; 
            return Value( distI*aH, distO*aH );
          }
        else
          {
            //separating straight line
            double a, b, c; 
            aDCA.getGeometricalDSSPtr()->getParameters(a, b, c); 
            //norm
            double n = std::sqrt(a*a + b*b); 
            //points
            Pair pair = *it; 
            Point i = pair.first; 
            Point o = pair.second;
            //distances
            double rI = NumberTraits<Coordinate>::castToDouble(i[0])*a + 
              NumberTraits<Coordinate>::castToDouble(i[1])*b + c;
            double distI = rI / n; 
            double rO = NumberTraits<Coordinate>::castToDouble(o[0])*a + 
              NumberTraits<Coordinate>::castToDouble(o[1])*b + c;
            double distO = rO / n; 
            return Value( distI*aH, distO*aH ); 
          }
      }

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The documentation for this struct was generated from the following file:

• SegmentComputerEstimators.h