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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 __itkRegionOfInterestImageFilter_hxx
#define __itkRegionOfInterestImageFilter_hxx
#include "itkRegionOfInterestImageFilter.h"
#include "itkImageAlgorithm.h"
#include "itkObjectFactory.h"
#include "itkProgressReporter.h"
#include "itkImage.h"
namespace itk
{
/**
*
*/
template< typename TInputImage, typename TOutputImage >
RegionOfInterestImageFilter< TInputImage, TOutputImage >
::RegionOfInterestImageFilter()
{}
/**
*
*/
template< typename TInputImage, typename TOutputImage >
void
RegionOfInterestImageFilter< TInputImage, TOutputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "RegionOfInterest: " << m_RegionOfInterest << std::endl;
}
template< typename TInputImage, typename TOutputImage >
void
RegionOfInterestImageFilter< TInputImage, TOutputImage >
::GenerateInputRequestedRegion()
{
// call the superclass' implementation of this method
Superclass::GenerateInputRequestedRegion();
// get pointer to the input
typename Superclass::InputImagePointer inputPtr =
const_cast< TInputImage * >( this->GetInput() );
if ( inputPtr )
{
// request the region of interest
inputPtr->SetRequestedRegion(m_RegionOfInterest);
}
}
template< typename TInputImage, typename TOutputImage >
void
RegionOfInterestImageFilter< TInputImage, TOutputImage >
::EnlargeOutputRequestedRegion(DataObject *output)
{
// call the superclass' implementation of this method
Superclass::EnlargeOutputRequestedRegion(output);
// generate everything in the region of interest
output->SetRequestedRegionToLargestPossibleRegion();
}
/**
* RegionOfInterestImageFilter can produce an image which is a different size
* than its input image. As such, RegionOfInterestImageFilter needs to provide an
* implementation for GenerateOutputInformation() in order to inform
* the pipeline execution model. The original documentation of this
* method is below.
*
* \sa ProcessObject::GenerateOutputInformaton()
*/
template< typename TInputImage, typename TOutputImage >
void
RegionOfInterestImageFilter< TInputImage, TOutputImage >
::GenerateOutputInformation()
{
// do not call the superclass' implementation of this method since
// this filter allows the input the output to be of different dimensions
// get pointers to the input and output
typename Superclass::OutputImagePointer outputPtr = this->GetOutput();
typename Superclass::InputImageConstPointer inputPtr = this->GetInput();
if ( !outputPtr || !inputPtr )
{
return;
}
// Set the output image size to the same value as the region of interest.
RegionType region;
IndexType start;
start.Fill(0);
region.SetSize( m_RegionOfInterest.GetSize() );
region.SetIndex(start);
// Copy Information without modification.
outputPtr->CopyInformation(inputPtr);
// Adjust output region
outputPtr->SetLargestPossibleRegion(region);
// Correct origin of the extracted region.
IndexType roiStart( m_RegionOfInterest.GetIndex() );
typename Superclass::OutputImageType::PointType outputOrigin;
inputPtr->TransformIndexToPhysicalPoint(roiStart, outputOrigin);
outputPtr->SetOrigin(outputOrigin);
}
/**
* RegionOfInterestImageFilter can be implemented as a multithreaded filter.
* Therefore, this implementation provides a ThreadedGenerateData()
* routine which is called for each processing thread. The output
* image data is allocated automatically by the superclass prior to
* calling ThreadedGenerateData(). ThreadedGenerateData can only
* write to the portion of the output image specified by the
* parameter "outputRegionForThread"
*
* \sa ImageToImageFilter::ThreadedGenerateData(),
* ImageToImageFilter::GenerateData()
*/
template< typename TInputImage, typename TOutputImage >
void
RegionOfInterestImageFilter< TInputImage, TOutputImage >
::ThreadedGenerateData(const RegionType & outputRegionForThread,
ThreadIdType threadId)
{
itkDebugMacro(<< "Actually executing");
// Get the input and output pointers
const TInputImage *inputPtr = this->GetInput();
TOutputImage *outputPtr = this->GetOutput();
// support progress methods/callbacks
ProgressReporter progress( this, threadId, 1 );
// Define the portion of the input to walk for this thread
InputImageRegionType inputRegionForThread;
inputRegionForThread.SetSize( outputRegionForThread.GetSize() );
IndexType start;
IndexType roiStart( m_RegionOfInterest.GetIndex() );
IndexType threadStart( outputRegionForThread.GetIndex() );
for ( unsigned int i = 0; i < ImageDimension; i++ )
{
start[i] = roiStart[i] + threadStart[i];
}
inputRegionForThread.SetIndex(start);
ImageAlgorithm::Copy( inputPtr, outputPtr, inputRegionForThread, outputRegionForThread );
progress.CompletedPixel();
}
} // end namespace itk
#endif
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