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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.
*
*=========================================================================*/
// Software Guide : BeginLatex
//
// Resampling can also be performed in multi-component images.
// This example compares nearest neighbor resampling using the Nearest
// neighbor and the linear interpolators for vector images.
//
// Try
// ResampleImageFilter9 Examples/Data/VisibleWomanEyeSlice.png
// SliceNearestNeighbor.png SliceLinear.png
//
// \index{itk::VectorResampleImageFilter!Image internal transform}
//
// Software Guide : EndLatex
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkVectorResampleImageFilter.h"
#include "itkIdentityTransform.h"
#include "itkVectorNearestNeighborInterpolateImageFunction.h"
#include "itkLinearInterpolateImageFunction.h"
#include "itkRGBPixel.h"
int main( int argc, char * argv[] )
{
if( argc < 4 )
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] <<
" inputImageFile outputImageFile_NearestNeighbor" <<
" outputImageFile_Linear " << std::endl;
return EXIT_FAILURE;
}
const unsigned int Dimension = 2;
typedef unsigned char PixelComponentType;
typedef itk::RGBPixel< PixelComponentType > PixelType;
typedef itk::Image< PixelType, Dimension > ImageType;
typedef itk::ImageFileReader< ImageType > ReaderType;
typedef itk::ImageFileWriter< ImageType > WriterType;
ReaderType::Pointer reader = ReaderType::New();
WriterType::Pointer writerNearest = WriterType::New(); // writer for nearest neighbor
WriterType::Pointer writerLinear = WriterType::New(); // writer for linear
reader->SetFileName( argv[1] );
writerNearest->SetFileName( argv[2] );
writerLinear->SetFileName( argv[3] );
typedef itk::VectorResampleImageFilter<
ImageType, ImageType > FilterType;
FilterType::Pointer nearestFilter = FilterType::New();
FilterType::Pointer linearFilter = FilterType::New();
//Interpolators
typedef itk::VectorNearestNeighborInterpolateImageFunction<
ImageType, double > NearestInterpolatorType;
NearestInterpolatorType::Pointer interpolatorNearest = NearestInterpolatorType::New();
typedef itk::VectorLinearInterpolateImageFunction<
ImageType, double > LinearInterpolatorType;
LinearInterpolatorType::Pointer interpolatorLinear = LinearInterpolatorType::New();
nearestFilter->SetInterpolator( interpolatorNearest );
linearFilter->SetInterpolator( interpolatorLinear );
typedef itk::IdentityTransform< double, Dimension > TransformType;
TransformType::Pointer transform = TransformType::New();
nearestFilter->SetTransform( transform );
linearFilter->SetTransform( transform );
// Software Guide : BeginCodeSnippet
PixelType defaultValue;
defaultValue.Fill(50);
nearestFilter->SetDefaultPixelValue( defaultValue );
linearFilter->SetDefaultPixelValue( defaultValue );
// Software Guide : EndCodeSnippet
// Software Guide : BeginCodeSnippet
ImageType::SpacingType spacing;
spacing[0] = .35; // pixel spacing in millimeters along X
spacing[1] = .35; // pixel spacing in millimeters along Y
nearestFilter->SetOutputSpacing( spacing );
linearFilter->SetOutputSpacing( spacing );
// Software Guide : EndCodeSnippet
// Software Guide : BeginCodeSnippet
ImageType::PointType origin;
origin[0] = 0.4; // X space coordinate of origin
origin[1] = 0.4; // Y space coordinate of origin
nearestFilter->SetOutputOrigin( origin );
linearFilter->SetOutputOrigin( origin );
// Software Guide : EndCodeSnippet
// Software Guide : BeginCodeSnippet
ImageType::DirectionType direction;
direction.SetIdentity();
nearestFilter->SetOutputDirection( direction );
linearFilter->SetOutputDirection( direction );
// Software Guide : EndCodeSnippet
ImageType::SizeType size;
size[0] = 300; // number of pixels along X
size[1] = 300; // number of pixels along Y
nearestFilter->SetSize( size );
linearFilter->SetSize( size );
nearestFilter->SetInput( reader->GetOutput() );
linearFilter->SetInput( reader->GetOutput() );
writerNearest->SetInput( nearestFilter->GetOutput() );
writerLinear->SetInput( linearFilter->GetOutput() );
try
{
writerNearest->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Exception thrown " << std::endl;
std::cerr << excp << std::endl;
}
try
{
writerLinear->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Exception thrown " << std::endl;
std::cerr << excp << std::endl;
}
return EXIT_SUCCESS;
}
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