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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkHistogramToImageFilter.txx,v $
Language: C++
Date: $Date: 2007-01-26 09:45:07 $
Version: $Revision: 1.8 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkHistogramToImageFilter_txx
#define __itkHistogramToImageFilter_txx
#include "itkHistogramToImageFilter.h"
#include <itkNumericTraits.h>
#include "itkProgressReporter.h"
namespace itk
{
/** Constructor */
template <class THistogram, class TFunction>
HistogramToImageFilter<THistogram, TFunction>
::HistogramToImageFilter()
{
this->SetNumberOfRequiredInputs(1);
m_Size.Fill(0);
m_Spacing.Fill(1.0);
m_Origin.Fill(0.0);
}
/** Destructor */
template <class THistogram, class TFunction>
HistogramToImageFilter<THistogram, TFunction>
::~HistogramToImageFilter()
{
}
/** Set the Input Histogram */
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::SetInput( const HistogramType *input)
{
// Histograms are not dataobjects, so need to decorate it to push it down
// the pipeline
typename InputHistogramObjectType::Pointer histogramObject =
InputHistogramObjectType::New();
histogramObject->Set( const_cast< HistogramType * >(input) );
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput(0, histogramObject );
}
/** Set the Input Histogram if already decorated */
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::SetInput( const InputHistogramObjectType *inputObject)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput(0,
const_cast< InputHistogramObjectType * >( inputObject ) );
}
template <class THistogram, class TFunction>
const typename HistogramToImageFilter< THistogram, TFunction >::InputHistogramObjectType *
HistogramToImageFilter<THistogram, TFunction>
::GetInput(void)
{
if (this->GetNumberOfInputs() < 1)
{
return 0;
}
return static_cast<const InputHistogramObjectType * >
(this->ProcessObject::GetInput(0) );
}
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::SetSpacing(const double* spacing)
{
SpacingType s(spacing);
this->SetSpacing( s );
}
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::SetOrigin(const double* origin)
{
PointType p(origin);
SetOrigin(p);
}
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::SetTotalFrequency( unsigned long n )
{
if( n < 1 )
{
itkExceptionMacro("Total frequency in the histogram must be at least 1.");
}
if( n == this->GetFunctor().GetTotalFrequency() )
{
return;
}
else
{
this->GetFunctor().SetTotalFrequency( n );
this->Modified();
}
}
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::GenerateOutputInformation()
{
// Get the input and output pointers
// Get from decorator
const HistogramType *inputHistogram = this->GetInput()->Get();
OutputImageType *outputImage = this->GetOutput();
// Set the image size to the number of bins along each dimension.
for( unsigned int i=0; i< ImageDimension; i++)
{
m_Size[i] = inputHistogram->GetSize(i);
m_Origin[i] = inputHistogram->GetBinMin(i,0);
m_Spacing[i] = inputHistogram->GetBinMin(i,1) - m_Origin[i];
}
// Set output image params and Allocate image
typename OutputImageType::RegionType region;
region.SetSize( m_Size );
outputImage->SetRegions( region );
outputImage->SetSpacing( m_Spacing ); // set spacing
outputImage->SetOrigin( m_Origin ); // and origin
}
//----------------------------------------------------------------------------
/** Update */
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::GenerateData(void)
{
itkDebugMacro(<< "HistogramToImageFilter::Update() called");
this->AllocateOutputs();
// Get the input and output pointers
// Get from decorator
const HistogramType *inputHistogram = this->GetInput()->Get();
OutputImageType *outputImage = this->GetOutput();
// Set the TotalFrequency in the functor
this->SetTotalFrequency( static_cast< unsigned long >(
inputHistogram->GetTotalFrequency() ));
ProgressReporter progress( this, 0,
outputImage->GetRequestedRegion().GetNumberOfPixels() );
// Fill image with frequencies from Histogram
ImageIteratorType iter( outputImage, outputImage->GetRequestedRegion() );
while( !iter.IsAtEnd() )
{
typename OutputImageType::IndexType idx = iter.GetIndex();
//Get histogram value at this idx and set it
iter.Set( m_Functor( static_cast< unsigned long >(
inputHistogram->GetFrequency( idx))));
++iter;
progress.CompletedPixel();
}
} // end update function
template <class THistogram, class TFunction>
void
HistogramToImageFilter<THistogram, TFunction>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Size : " << m_Size << std::endl;
os << indent << "Origin: " << m_Origin << std::endl;
os << indent << "Spacing: " << m_Spacing << std::endl;
os << indent << "Sum of frequencies of measurement vectors of the histogram: " <<
m_Functor.GetTotalFrequency() << std::endl;
}
} // end namespace itk
#endif
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