DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue > Class Template Reference

Aim: Functor that subsamples an initial domain by given a grid size and a shift vector. By this way, for a given point considered in a new domain, it allows to recover the point coordinates in the source domain. Such functor can be usefull to apply basic image subsampling in any dimensions by using ImageAdapter class. More...

#include <DGtal/kernel/BasicPointFunctors.h>

Public Types
typedef TDomain::Space	Space
typedef TDomain::Size	Size
typedef TDomain::Integer	IntergerDom
typedef Space::Dimension	Dimension
typedef Space::Point	Point

Public Member Functions
	BasicDomainSubSampler (const TDomain &aSourceDomain, const std::vector< TValue > &aGridSize, const Point &aGridShift)
Point	operator() (const Point &aPoint) const
const TDomain &	getSubSampledDomain ()

Private Attributes
TDomain	mySourceDomain
TDomain	myNewDomain
TDomain	myGridSampleDomain
Point	myGridShift
std::vector< TValue >	myGridSize

Detailed Description

template<typename TDomain, typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>
class DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >

Aim: Functor that subsamples an initial domain by given a grid size and a shift vector. By this way, for a given point considered in a new domain, it allows to recover the point coordinates in the source domain. Such functor can be usefull to apply basic image subsampling in any dimensions by using ImageAdapter class.

Description of template class 'BasicDomainSubSampler'

See also

tests/kernel/testBasicPointFunctors.cpp

Template Parameters

TDomain	the type of the domain.
TInteger	specifies the integer number type used to define the space.
TValue	specify the type of the value which define the grid size (generally type int (default) when subsampling with large grid size and double to re sampling with grid size less than 1).

Examples

images/imageBasicSubsampling.cpp.

Definition at line 637 of file BasicPointFunctors.h.

Member Typedef Documentation

Dimension

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

typedef Space::Dimension DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::Dimension

Definition at line 643 of file BasicPointFunctors.h.

IntergerDom

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

typedef TDomain::Integer DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::IntergerDom

Definition at line 642 of file BasicPointFunctors.h.

Point

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

typedef Space::Point DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::Point

Definition at line 644 of file BasicPointFunctors.h.

Size

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

typedef TDomain::Size DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::Size

Definition at line 641 of file BasicPointFunctors.h.

Space

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

typedef TDomain::Space DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::Space

Definition at line 640 of file BasicPointFunctors.h.

Constructor & Destructor Documentation

BasicDomainSubSampler()

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::BasicDomainSubSampler ( const TDomain &  aSourceDomain, const std::vector< TValue > &  aGridSize, const Point &  aGridShift  )

inline

Constructor. Construct the functor from a source domain, a grid size, and a shift vector. The points of the resulting domain are defined as the upper left of the sampling grid.

Parameters

aSourceDomain	the source domain.
aGridSize	the subsampling grid size.
aGridShift	the shift applied to the sampling grid.

Definition at line 657 of file BasicPointFunctors.h.

                                                   : mySourceDomain(aSourceDomain),
                                                     myGridShift(aGridShift),
                                                     myGridSize(aGridSize)
    {
      Point domainUpperBound=aSourceDomain.upperBound();
      Point domainLowerBound=aSourceDomain.lowerBound();
 
      for (Dimension dim=0; dim< Space::dimension; dim++){
        domainLowerBound[dim] = static_cast<IntergerDom>(floor(NumberTraits<IntergerDom>::castToDouble(domainLowerBound[dim]) /
                                                               NumberTraits<TValue>::castToDouble( aGridSize[dim] )));        
        domainUpperBound[dim] = static_cast<IntergerDom>(floor(NumberTraits<IntergerDom>::castToDouble(domainUpperBound[dim]) /
                                                               NumberTraits<TValue>::castToDouble( aGridSize[dim] )));
      }
      myNewDomain = TDomain(domainLowerBound,
                            domainUpperBound);
      Point upperGrid;
      for (Dimension dim=0; dim < Space::dimension; dim++)
        upperGrid[dim] = myGridSize[dim];
      myGridSampleDomain = TDomain(Point::diagonal(0), upperGrid);
    };

References DGtal::PointVector< dim, Integer >::diagonal(), dim, DGtal::SpaceND< dim, TInteger >::dimension, DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridSampleDomain, DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridSize, and DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myNewDomain.

Member Function Documentation

getSubSampledDomain()

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

const TDomain & DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::getSubSampledDomain ( )

inline

This method can be usefull to directely recover the new domain associated to the resulting subsampled domain.

Returns

the new subsampled domain.

Examples

images/imageBasicSubsampling.cpp.

Definition at line 726 of file BasicPointFunctors.h.

                                         {
      return myNewDomain;
    }

References DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myNewDomain.

Referenced by main().

operator()()

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

Point DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::operator() ( const Point &  aPoint ) const

inline

The operator computes the coordinates of the point in the subsampled domain. By default it returns the first lower point of the window associated to the sampling grid. If the resulting point is outside the source domain it scans this window and returns a point belonging to the source domain. If such a point does not exits it return the point with null coordinates.

Parameters

aPoint

a point which should belong to the new domain.

Returns

the point to be taken in the subsampled domain.

Definition at line 694 of file BasicPointFunctors.h.

    {
      Point ptRes = Point::diagonal(0);
      if(!myNewDomain.isInside(aPoint)){
        trace.error() << " The point is not in the source domain: "<<  aPoint << std::endl;
        return ptRes;
      }
 
      for (Dimension dim=0; dim< Space::dimension; dim++){
        ptRes[dim] = static_cast<TInteger>(floor(NumberTraits<TInteger>::castToDouble(aPoint[dim])*
                                                 NumberTraits<TValue>::castToDouble(myGridSize[dim])));
      }
      ptRes +=myGridShift;
 
      if(!mySourceDomain.isInside(ptRes)){
        // we are looking for a point inside the domain
        for(typename TDomain::ConstIterator it = myGridSampleDomain.begin();
            it!= myGridSampleDomain.end(); it++){
          if (mySourceDomain.isInside(ptRes+(*it)))
            return ptRes+(*it);
        }
      }
      return ptRes;
    }

References aPoint(), DGtal::PointVector< dim, Integer >::diagonal(), dim, DGtal::SpaceND< dim, TInteger >::dimension, DGtal::Trace::error(), DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridSampleDomain, DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridShift, DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridSize, DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myNewDomain, DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::mySourceDomain, and DGtal::trace.

Field Documentation

myGridSampleDomain

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

TDomain DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridSampleDomain

private

Definition at line 734 of file BasicPointFunctors.h.

Referenced by DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::BasicDomainSubSampler(), and DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::operator()().

myGridShift

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

Point DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridShift

private

Definition at line 735 of file BasicPointFunctors.h.

Referenced by DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::operator()().

myGridSize

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

std::vector<TValue> DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myGridSize

private

Definition at line 736 of file BasicPointFunctors.h.

Referenced by DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::BasicDomainSubSampler(), and DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::operator()().

myNewDomain

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

TDomain DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::myNewDomain

private

Definition at line 732 of file BasicPointFunctors.h.

Referenced by DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::BasicDomainSubSampler(), DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::getSubSampledDomain(), and DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::operator()().

mySourceDomain

template<typename TDomain , typename TInteger = DGtal::int32_t, typename TValue = typename TDomain::Size>

TDomain DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::mySourceDomain

private

Definition at line 731 of file BasicPointFunctors.h.

Referenced by DGtal::functors::BasicDomainSubSampler< TDomain, TInteger, TValue >::operator()().

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

• BasicPointFunctors.h