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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkHistogramToImageFilter_hxx
#define itkHistogramToImageFilter_hxx
#include "itkHistogramToImageFilter.h"
#include "itkNumericTraits.h"
#include "itkProgressReporter.h"
namespace itk
{
/** Constructor */
template< typename THistogram, typename TImage, typename TFunction >
HistogramToImageFilter< THistogram, TImage, TFunction >
::HistogramToImageFilter()
{
this->SetNumberOfRequiredInputs(1);
}
/** Destructor */
template< typename THistogram, typename TImage, typename TFunction >
HistogramToImageFilter< THistogram, TImage, TFunction >
::~HistogramToImageFilter()
{}
/** Set the Input Histogram */
template< typename THistogram, typename TImage, typename TFunction >
void
HistogramToImageFilter< THistogram, TImage, TFunction >
::SetInput(const HistogramType *input)
{
// Process object is not const-correct so the const_cast is required here
HistogramType * histogram = const_cast< HistogramType * >( input );
this->ProcessObject::SetNthInput(0, histogram);
}
template< typename THistogram, typename TImage, typename TFunction >
const typename HistogramToImageFilter< THistogram, TImage, TFunction >::HistogramType *
HistogramToImageFilter< THistogram, TImage, TFunction >
::GetInput(void)
{
return itkDynamicCastInDebugMode< const HistogramType * >( this->GetPrimaryInput() );
}
template< typename THistogram, typename TImage, typename TFunction >
void
HistogramToImageFilter< THistogram, TImage, TFunction >
::SetTotalFrequency(SizeValueType 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< typename THistogram, typename TImage, typename TFunction >
void
HistogramToImageFilter< THistogram, TImage, TFunction >
::GenerateOutputInformation()
{
// we need the input histogram to be up to date, so we can look at its values
// to compute the size, spacing and origin of the output image.
// the GetInput() from ProcessObject is used to get a non const histogram.
this->ProcessObject::GetInput(0)->Update();
// Get the input and output pointers
// Get from decorator
const HistogramType *inputHistogram = this->GetInput();
OutputImageType * outputImage = this->GetOutput();
SizeType size;
PointType origin;
SpacingType spacing;
// Set the image size to the number of bins along each dimension.
// TODO: is it possible to have a size 0 on one of the dimension? if yes, the size must be checked
unsigned int minDim = std::min((unsigned int)ImageDimension, inputHistogram->GetMeasurementVectorSize());
for ( unsigned int i = 0; i < minDim; i++ )
{
size[i] = inputHistogram->GetSize(i);
origin[i] = inputHistogram->GetMeasurement(0, i);
spacing[i] = inputHistogram->GetBinMax(i, 0) - inputHistogram->GetBinMin(i, 0);
}
// if the image is of greater dimension than the histogram, use some default values
for ( unsigned int i = inputHistogram->GetMeasurementVectorSize(); i<ImageDimension; i++ )
{
size[i] = 1;
origin[i] = 0.0;
spacing[i] = 1.0;
}
// Set output image params and Allocate image
typename OutputImageType::RegionType region;
region.SetSize(size);
outputImage->SetRegions(region);
outputImage->SetSpacing(spacing); // set spacing
outputImage->SetOrigin(origin); // and origin
}
//----------------------------------------------------------------------------
/** Update */
template< typename THistogram, typename TImage, typename TFunction >
void
HistogramToImageFilter< THistogram, TImage, TFunction >
::GenerateData(void)
{
itkDebugMacro(<< "HistogramToImageFilter::Update() called");
this->AllocateOutputs();
// Get the input and output pointers
// Get from decorator
const HistogramType *inputHistogram = this->GetInput();
OutputImageType * outputImage = this->GetOutput();
// Set the TotalFrequency in the functor
this->SetTotalFrequency( static_cast< SizeValueType >(
inputHistogram->GetTotalFrequency() ) );
ProgressReporter progress( this, 0,
outputImage->GetRequestedRegion().GetNumberOfPixels() );
typedef typename HistogramType::ConstIterator HistogramIterator;
typedef typename HistogramType::AbsoluteFrequencyType AbsoluteFrequencyType;
HistogramIterator hitr = inputHistogram->Begin();
// Fill image with frequencies from Histogram
ImageIteratorType iter( outputImage, outputImage->GetRequestedRegion() );
while ( !iter.IsAtEnd() )
{
const AbsoluteFrequencyType & value = hitr.GetFrequency();
iter.Set( m_Functor( static_cast< SizeValueType >( value ) ) );
++iter;
++hitr;
progress.CompletedPixel();
}
} // end update function
template< typename THistogram, typename TImage, typename TFunction >
void
HistogramToImageFilter< THistogram, TImage, TFunction >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Sum of frequencies of measurement vectors of the histogram: "
<< m_Functor.GetTotalFrequency() << std::endl;
}
} // end namespace itk
#endif
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